Green electricity and guarantees of origin - The Sustainability Management Wiki

Authors: Edison Ismajli
Edited by: –
Last updated: May 11, 2026

Executive summary

Guarantees of Origin (GoOs) are electronic certificates that track the renewable attribute of electricity in liberalized power markets. They enable companies and consumers to credibly claim renewable electricity use even though physical electricity flows mix on the grid. In Europe, GoOs primarily serve disclosure and accounting purposes rather than acting as a direct policy support instrument for building new renewable capacity.

GoO markets operate through a lifecycle of issuance, transfer/trading, and cancellation. Certificates are issued per megawatt-hour of eligible renewable generation and carry information such as technology type, location, and production period. When a buyer cancels a certificate, the system prevents the same renewable attribute from being claimed twice and supports standardized electricity disclosure across countries.

Corporate demand has become a major driver of voluntary certificate markets because GoOs fit common Scope 2 reporting practices and ESG disclosure needs. Companies typically procure GoOs either as stand-alone certificates, through bundled green electricity contracts, or alongside investment-oriented approaches such as power purchase agreements (PPAs) and on-site generation. Many organizations use a portfolio of instruments to balance flexibility, cost, and credibility.

Key limitations shape how organizations should interpret and communicate GoO-based claims. Critics highlight limited additionality (certificate purchases often do not trigger new renewable investment), temporal mismatch (annual matching can mask real-time gaps between generation and consumption), and oversupply that can weaken price signals. These issues also create greenwashing risks if organizations equate certificate-backed accounting claims with physical decarbonization outcomes.

For sustainability management, the practical implication is to treat GoOs as a transparency tool that strengthens renewable electricity accounting, not as a stand-alone decarbonization strategy. Organizations can improve integrity by combining GoOs with investment-linked procurement (e.g., PPAs), improving temporal and geographic alignment where feasible, and communicating claims with clear boundaries between accounting-based results and real-world system impacts.

1 Introduction

1.1 Relevance for energy markets, policy and corporate sustainability

The importance of Guarantees of Origin has increased substantially over the past decade, driven by developments in energy markets, climate policy, and corporate sustainability. From an energy market perspective, GoOs have become an integral component of electricity disclosure systems in Europe, enabling consumers to differentiate between renewable and nonrenewable electricity products in liberalized markets.¹ ² As renewable electricity generation has expanded across Europe, the trading of renewable attributes through GoOs has developed into a distinct market layer alongside physical electricity trading.

From a policy perspective, guarantees of origin occupy a specific position within the European renewable energy framework. While they are formally embedded in European regulation, they are not designed as a primary support mechanism for renewable energy deployment. Instead, their primary function is to ensure the transparency and credibility of renewable electricity claims, particularly in the context of electricity disclosure and voluntary consumption choices.³ This has given rise to an ongoing debate about whether GoOs should remain a purely informational instrument or be more closely linked to policy objectives such as additional renewable capacity or emissions reductions.

The growing significance of Guarantees of Origin is especially pronounced in the corporate environment. A growing number of companies have adopted climate neutrality targets or commitments to source “100% renewable electricity” as part of their environmental, social, and governance (ESG) strategies. In such contexts, GoOs are frequently used as a malleable and relatively economical instrument to substantiate renewable electricity claims across geographically dispersed operations.⁴ ⁵ Empirical evidence indicates that corporate demand has emerged as a key driver of voluntary markets for renewable electricity certificates, exerting influence on both trading volumes and market dynamics.

Concurrently, the pervasive utilization of Guarantees of Origin by corporations has given rise to apprehensions concerning their environmental efficacy. A multitude of studies contend that GoOs frequently exhibit an absence of additionality, as they often fail to precipitate novel investments in renewable energy. Instead, they have been shown to reallocate preexisting renewable attributes.⁶ ⁷ Additional challenges pertain to temporal discrepancies between electricity generation and consumption, as well as the potential for greenwashing if certificate-based claims are not adequately constrained or transparently communicated.⁸

In short, Guarantees of Origin signify a profoundly pertinent yet contentious instrument at the nexus of energy markets, climate policy, and corporate sustainability. Their increasing use in voluntary markets underscores the necessity for a systematic evaluation of their conceptual foundations, market functioning, and practical ramifications. This work addresses this need by conducting a review of the extant academic literature on Guarantees of Origin and by analyzing their role in electricity markets and corporate renewable electricity procurement.

1.2 Definition of green electricity

The decarbonization of the electricity sector is a key component of climate mitigation strategies in Europe and globally. As electricity increasingly displaces fossil fuels in sectors such as transportation, heating, and industry, the environmental attributes of electricity consumption have gained significant relevance for policymakers, companies, and consumers. In liberalized electricity markets, this has given rise to the development of instruments that facilitate the identification and communication of the renewable origin of electricity, independent of physical power flows.⁹ ¹⁰

In this context, the term “green electricity” refers to electricity derived from renewable energy sources, such as wind, solar, hydro, and biomass. However, due to the inherent physical properties of interconnected electricity grids, electricity from different generation sources is indistinguishably mixed during transmission and distribution. Consequently, it cannot directly trace the origin of the electricity consumed by end users. To address this limitation, disclosure and tracking mechanisms have been introduced to document the renewable origin of electricity supplied to consumers.⁴

1.3 Definition and function of guarantees of origin

In the European Union, this function is fulfilled by Guarantees of Origin (GoOs). Guarantees of Origin are electronic certificates issued for each megawatt-hour of electricity generated from renewable energy sources. These certificates serve as a means to distinguish between the renewable nature of electricity and its physical delivery through the grid. By implementing these measures, GoOs empower consumers and companies to claim the use of renewable electricity irrespective of the actual electricity flows.¹¹

1.4 Distinction from other instruments (TGCs, RECs, PPAs)

It is imperative to draw distinctions between Guarantees of Origin and other policy instruments and procurement mechanisms employed to promote renewable electricity. In contrast to feed-in tariffs or investment subsidies, GoOs do not provide direct financial support to renewable energy producers and do not aim to incentivize new generation capacity. In a similar vein, GoOs differ from long-term power purchase agreements (PPAs), which are defined as contractual arrangements between electricity producers and consumers that can directly support investment in renewable assets. Instead, GoOs primarily function as a market-based disclosure and accounting instrument within the electricity market, allowing voluntary demand for renewable attributes to be expressed.³ ¹²

This conceptual distinction is essential for understanding the role and limitations of Guarantees of Origin in energy markets and corporate sustainability strategies. While GoOs increase transparency regarding the renewable origin of electricity consumption, their contribution to broader climate and energy policy objectives depends on how they are used within electricity markets and corporate sustainability strategies.

1.5 Structure of the article

The remainder of this article is structured as follows: Section 2 outlines the methodological approach, detailing the search strategy, selection criteria, and the thematic clustering of the literature review. Section 3 establishes the conceptual and regulatory foundations, exploring the theoretical mechanics of tradable green certificate schemes and the specific regulatory context of European Guarantees of Origin. Section 4 transitions to the practical implementation of GoOs in corporate renewable electricity procurement. It examines the corporate motivations and various procurement models, before critically analyzing the central barriers and limitations of the instrument, particularly the ongoing debates surrounding additionality, temporal mismatch, and greenwashing. Finally, the article synthesizes the structural trade-offs of the GoO system and evaluates the overarching implications for both EU policy and corporate sustainability strategies.

2 Literature review

2.1 Conceptual foundations: Market-based instruments for renewable electricity

2.1.1 Price-based and quantity-based instruments

The promotion of renewable electricity has historically relied on a range of policy instruments. These instruments have been designed to correct market failures associated with environmental externalities and high upfront investment costs. A broad categorization of these instruments reveals two overarching approaches: price-based and quantity-based mechanisms. These mechanisms reflect divergent strategies for incentivizing renewable energy deployment.¹³ Price-based instruments, including feed-in tariffs and feed-in premiums, ensure renewable energy producers receive a predetermined or minimum price for electricity generated, thereby mitigating investment risk. Conversely, quantity-based instruments establish a predetermined target for renewable electricity generation, thereby enabling market forces to determine the price necessary to achieve this target.

2.1.2 Tradable green certificate schemes

In this conceptual framework, tradable green certificate schemes serve as a notable illustration of quantity-based policy instruments. In the context of such programs, electricity suppliers are obligated to derive a specified proportion of their electricity from renewable energy sources.

Compliance is evidenced by the acquisition of tradable certificates.¹² Renewable electricity producers receive certificates in proportion to their generation, which can then be traded separately from physical electricity. The price of these certificates is determined by the forces of supply and demand, with the objective of providing an additional revenue stream for renewable generators.

The economic rationale for tradable green certificates rests on the expectation that market-based competition will result in cost-efficient achievement of renewable energy targets. The objective of enabling certificate trading in such systems is to ensure the optimal production of renewable electricity, thereby minimizing overall system costs.¹³ Furthermore, as targets for renewable energy increase, it is anticipated that certificate prices will reflect scarcity, thereby functioning as investment signals for new renewable capacity.

Nevertheless, the efficacy of tradable green certificate schemes has been the subject of extensive academic debate. A multitude of studies have indicated that certificate-based systems have the potential to subject investors to considerable price volatility. This is due to the fact that certificate prices are contingent upon policy design, target stringency, and expectations regarding future regulation.¹⁴ This lack of clarity can lead to increased financing costs and the potential obstruction of long-term investment in renewable energy generation, particularly for capital-intensive technologies.

Beyond their role as support mechanisms, tradable certificates have also been discussed as informational and disclosure instruments within liberalized electricity markets. As electricity from different generation sources cannot be physically distinguished once fed into the grid, certificates serve as a means to communicate the renewable attribute of electricity consumption to end users.¹⁵ In markets where consumers have the capacity to select electricity products based on their environmental characteristics, the informational function becomes increasingly pertinent.

Guarantees of Origin can be conceptualized as an institutional evolution of these certificate concepts. While the underlying logic of Guarantees of Origin is similar to that of the Renewable Energy Directive, which seeks to separate the renewable attribute from physical electricity flows, Guarantees of Origin are not primarily designed as quantity-based support instruments with binding targets. Instead, the focus has shifted to disclosure and the voluntary demand for renewable electricity attributes.³ Consequently, they occupy a distinct position within the broader landscape of market-based instruments for renewable electricity.

The distinction between support-oriented certificate schemes and disclosure-oriented instruments is crucial for assessing the role of Guarantees of Origin in electricity markets. Whereas tradable green certificates are typically embedded in mandatory policy frameworks aimed at driving capacity expansion, Guarantees of Origin operate predominantly in voluntary markets and serve as a means of substantiating renewable electricity claims. This conceptual difference has important implications for their economic effects, market dynamics, and potential contribution to climate and energy policy objectives, which are examined in the subsequent sections of this work.

2.1.3 Efficiency considerations and investment incentives

Beyond the fundamental distinction between price-based and quantity-based instruments, the economic literature underscores efficiency considerations as a key criterion for evaluating renewable energy policy instruments. Market-based mechanisms, including tradable certificate schemes, are often justified on the basis of static cost efficiency. By enabling the generation of renewable electricity in regions where marginal costs are lowest, certificate markets are anticipated to reduce the overall cost of achieving a specified renewable energy target.¹³ Conversely, administratively established support programs may result in elevated system expenditures if technology implementation does not align with cost variations across technologies or geographical locations.

In addition to static efficiency, dynamic efficiency plays a crucial role in the long-term transformation of the electricity system. The concept of dynamic efficiency pertains to the capacity of policy instruments to promote technological learning, innovation, and cost reductions over time. From this perspective, tradable green certificate schemes are often lauded for their technology-neutral design, which enables disparate renewable technologies to compete on an equal footing.¹⁶ Proponents of this approach contend that such competition can catalyze innovation by channeling investment toward the most promising technologies. Critics, however, have noted that technology-neutral certificate systems may impede the development of emerging technologies that are not yet cost-competitive, potentially hindering technological diversification and long-term system resilience.

Investment incentives represent a key component in the evaluation of market-based renewable energy instruments. The purpose of certificate prices is to establish an additional revenue stream for renewable electricity producers, thereby enhancing the profitability of renewable investments. In principle, rising certificate prices are indicative of increasing scarcity and serve as a motivator for investment in new renewable energy capacity. However, in practice, investment decisions are influenced not only by expected price levels but also by price volatility and regulatory stability.¹⁴ High certificate price volatility has the potential to increase uncertainty and raise financing costs, particularly for capital-intensive renewable technologies with long payback periods.

Regulatory design and credibility therefore, play a decisive role in determining the effectiveness of certificate-based instruments. Frequent policy changes, unclear long-term targets, or political uncertainty have the potential to undermine investor confidence and weaken the intended investment signals of certificate markets. Empirical studies on certificate schemes have demonstrated that expectations regarding future policy adjustments frequently exert a more significant influence on investment behavior than short-term price fluctuations.¹⁷ This finding underscores the significance of stable and transparent policy frameworks when relying on market-based instruments to support the deployment of renewable energy sources.

2.1.4 Informational function of certificate systems

Beyond considerations of investment and efficiency, certificate-based instruments also fulfill an informational function in liberalized electricity markets. As electricity consumers increasingly demand environmentally differentiated products, certificates provide a mechanism to convey information about the renewable attributes of electricity consumption.¹⁵ In markets where consumers and companies seek to align electricity consumption with sustainability preferences, even in the absence of mandatory policy obligations, this informational role becomes particularly relevant.

In light of this theoretical foundation, Guarantees of Origin can be conceptualized as a particular institutional manifestation of certificate-based mechanisms. While they inherit the logic of separating renewable attributes from physical electricity flows, they differ fundamentally from classic tradable green certificate schemes in their policy intent and market design. Guarantees of Origin, on the other hand, are not embedded in mandatory quota systems and do not impose binding targets on electricity suppliers. Instead, they primarily facilitate disclosure and voluntary demand for renewable electricity attributes.³ Consequently, the economic effects, market dynamics, and investment implications of these programs differ considerably from those of support-oriented certificate schemes.

This distinction is critical for the subsequent analysis. A comprehensive understanding of the theoretical advantages and limitations of market-based certificate systems serves as the foundation for assessing the role of Guarantees of Origin in practice. The subsequent section, therefore, examines the regulatory background and institutional design of Guarantees of Origin in Europe, building on the conceptual insights developed in this chapter.

2.1.5 Global certificate systems

Certificate-based systems for tracking and allocating renewable electricity are not an isolated EU instrument, but have become established globally.¹⁸ All of these systems are predicated on a similar underlying logic: they separate the physical delivery of electricity from the environmental attributes of its generation, thereby rendering the latter transparently tradable.¹⁹

In the United States, Renewable Energy Certificates (RECs) are used in both mandatory compliance markets, such as state-level quotas, and a significant voluntary market.²⁰ This voluntary market is heavily corporate-driven, motivated by sustainability goals, and closely resembles the functioning and use of European Guarantees of Origin.¹⁵

In contrast, Tradable Green Certificates (TGCs) in China are designed much more strongly as a political steering instrument.²¹ Their stated objective, frequently in conjunction with Renewable Portfolio Standards (RPS), is to promote the expansion of renewable energy and support the national decarbonization strategy.²² However, the extant literature critically discusses the effectiveness of this system, noting that especially when power and certificate trading are strictly separated, there is a lack of additionality for actual emission reductions, causing the system to partially lose market liquidity and investment impact.²¹ ²²

Further institutional disparities are evident in other Asian markets, such as Japan and South Korea.¹⁸ Japan established a Green Electricity Certificate (GEC) system early on, tailoring it from the outset to the voluntary demand of its highly export-oriented industry.¹⁸

Conversely, South Korea initially adopted a divergent market logic, implementing a strictly regulated approach wherein certificates functioned predominantly as a mandatory instrument for power generators to meet expansion quotas.¹⁸ Subsequently, in alignment with global supply chain imperatives and corporate sustainability objectives, the South Korean system was also made accessible to the voluntary corporate market.¹⁸

A comparison with the EU reveals the central conceptual difference and the added value of this analysis. Certificate systems have been implemented in various regions worldwide, including China and South Korea. These systems have been used as instruments for directing investment and achieving political capacity targets. In contrast, European GoOs are defined by regulation as a disclosure instrument exclusively.¹⁸ ²²

The fundamental distinction between the EU and other countries is rooted in their respective objectives. The EU primarily utilizes the system to promote transparency and prevent double counting within the liberalized internal market. In contrast, other countries employ certificates to directly influence investments in new generation capacities.¹⁹

To summarize, while analogous mechanisms exist globally, their institutional objectives contrast sharply. The European GoO system is strictly designed as an accounting and disclosure instrument to prevent double counting within a liberalized internal market.¹⁸ In contrast, the United States features a bifurcated system where Renewable Energy Certificates (RECs) serve both mandatory state-level Renewable Portfolio Standards (RPS) and a large, corporate-driven voluntary market.¹⁸ Meanwhile, China utilizes Green Electricity Certificates (GECs) primarily as a political steering mechanism. The Chinese system is increasingly coupling certificates with mandatory RPS quotas and Carbon Emission Trading (CET) schemes to transition away from state subsidies and directly enforce national decarbonization targets.¹⁸ ²¹

2.2 Regulatory background of guarantees of origin in Europe

2.2.1 Regulatory embedding under EU Renewable Energy Directives

The regulatory framework for Guarantees of Origin in Europe is closely linked to the liberalization of electricity markets and the increasing emphasis on transparency and consumer choice. With the advent of competitive electricity markets, the necessity for reliable information regarding the origin and environmental impact of electricity supplied to end consumers became apparent. In this context, Guarantees of Origin were introduced as a standardized instrument to document the renewable origin of electricity across national borders.³

At the European level, Guarantees of Origin are embedded in the broader renewable energy policy framework, yet they fulfill a distinct function compared to traditional support instruments. While policy measures such as feed-in tariffs, feed-in premiums, or renewable energy auctions are designed to directly incentivize investment in renewable generation capacity, Guarantees of Origin primarily serve as a disclosure and tracking mechanism. The fundamental objective of the organization is to guarantee that claims pertaining to renewable electricity consumption are transparent, verifiable, and comparable across member states.¹

2.2.2 Electricity disclosure and avoidance of double counting

A central regulatory objective of the GoO system is to avoid double counting of renewable electricity attributes. The system’s design entails the issuance of a certificate for each megawatt-hour of renewable electricity generated, with these certificates being canceled once used. This approach is intended to ensure that renewable attributes are claimed only once. This principle assumes particular importance in the context of interconnected European electricity markets, where physical electricity flows frequently traverse national borders, while renewable generation and consumption may occur in disparate jurisdictions.¹¹

European directives mandate the provision of reliable information regarding the energy sources and environmental impacts of electricity mixes by electricity suppliers to their customers, thereby operationalizing electricity disclosure.¹¹ In this context, Guarantees of Origin function as the primary tracking instrument, enabling a “book and claim” system where environmental attributes can be reliably allocated to specific consumers.¹¹ This tracking is crucial to prevent the double counting of renewable attributes, especially given the interconnected nature of European power grids where physical electricity and certificates can be traded across borders.¹¹ While mandatory support schemes like quota-based Tradable Green Certificates (TGCs)— such as the joint Swedish-Norwegian system—aim to directly incentivize new renewable generation capacity, the GO system mainly empowers consumers to make informed choices.¹¹ Despite the fact that electricity disclosure exerts a limited direct impact on capacity expansion in comparison with dedicated support schemes, it engenders a customer-driven demand for green electricity that serves to supplement overarching renewable energy targets.¹¹

Contrary to the mandatory, quota-based certificate schemes, Guarantees of Origin are not linked to binding renewable energy targets for electricity suppliers. Instead, they predominantly function within voluntary markets, where demand is propelled by consumers and companies seeking to substantiate renewable electricity claims. This regulatory design reflects the intention to separate the informational function of GoOs from policy instruments that directly steer investment decisions. Consequently, Guarantees of Origin are positioned intermediate between energy policy, electricity market regulation, and voluntary sustainability initiatives.² Figure 1 illustrates the position of Guarantees of Origin within the European renewable electricity framework.

Figure 1: Position of guarantees of origin within the European electricity market framework (own illustration)

2.2.3 National implementation differences and market implications

The regulatory background of Guarantees of Origin also reflects significant heterogeneity across European countries. While the overarching principles are harmonized at the European level, national implementation varies with respect to administrative procedures, market oversight, and integration with electricity disclosure systems. These disparities influence the functioning of national GoO markets, trading volumes, and price levels, contributing to variation in market outcomes across countries.²³

An additional regulatory aspect concerns the relationship between Guarantees of Origin and electricity disclosure obligations. In numerous European countries, electricity suppliers are obligated to disclose the fuel mix of the electricity they supply to consumers. Guarantees of Origin play a key role in this process by providing the documentary basis for attributing renewable shares to electricity products. In this sense, GoOs contribute to consumer information and trust, even in cases where consumers do not actively participate in voluntary green electricity markets.¹¹

Despite their primarily informational role, Guarantees of Origin have become increasingly relevant in the context of voluntary climate action by corporations. The formal recognition of GoOs as valid evidence of renewable electricity consumption has contributed to their extensive utilization in corporate sustainability reporting and climate strategies. Concurrently, this has led to an escalation in the discourse surrounding the question of whether an instrument initially developed for the purpose of disclosure should assume such a prominent role in corporate decarbonization initiatives.¹ ³

The regulatory framework for Guarantees of Origin (GoOs) is indicative of a deliberate policy choice to differentiate between renewable electricity disclosure and direct support mechanisms. This separation has facilitated the emergence of cross-border markets for renewable electricity attributes. However, it has also given rise to inquiries concerning the alignment of GoOs with overarching climate and energy policy objectives. An understanding of this regulatory background is essential for analyzing the market functioning and practical use of Guarantees of Origin, which are examined in the following chapter.

2.3 Market functioning and performance of GoO markets

Guarantees of Origin (GoOs) are designed as a standardized tracking instrument that links renewable electricity generation to claims made by electricity suppliers, consumers, or companies. The functionality of these instruments is contingent upon a series of institutional procedures that generally encompass the issuance, transfer, and cancellation (or redemption) of certificates. This process enables the documentation and trade of the renewable attribute of electricity as a discrete entity, separate from its physical form. It also ensures that each unit of renewable origin can only be claimed once.³ ¹¹ Comprehension of these steps is imperative for the evaluation of market outcomes, as the design choices at each stage exert a significant influence on market liquidity, transparency, and the credibility of renewable electricity claims.

2.3.1 Issuance and certificate characteristics

The GoO lifecycle commences with issuance. Certificates are generally issued to renewable electricity producers for each megawatt-hour of eligible renewable electricity generated. The determination of eligibility is guided by the national implementation rules within the European framework, which delineate the technologies that qualify and the requisite information to be included in a certificate. In practice, GoOs function as a standardized “attribute unit” that carries information such as the generation technology (e.g., wind, solar, hydro), the production location, the production period, and the issuing body. This information is key to disclosure, as it facilitates the differentiation between certificate types and supports market segmentation.²³

Despite the harmonization of GoOs through European regulations, national implementation discrepancies can influence certificate characteristics and administrative procedures. It is important to note that discrepancies may arise in relation to the following aspects: the timing of issuance, the administrative fees associated, the validity periods, and the integration of national registries. Such heterogeneity has been demonstrated to affect transaction costs and contribute to the emergence of disparate trading patterns across nations, even in the context of facilitated cross-border transfers.²³ From a market perspective, this implies that GoO markets operate as an interconnected European system with national institutional “frictions” rather than as a fully uniform single market.

Additionally, GoO markets have been observed to interact with electricity disclosure systems. In numerous European countries, electricity suppliers are obligated to disclose the composition of the fuel mix for their electricity products. The utilization of GoOs as documentary evidence is key in the attribution of renewable shares to electricity supply and the substantiation of “green electricity” offerings. The disclosure function in question establishes a fundamental demand for certificates associated with retail electricity products. However, it is important to note that this demand may be augmented by voluntary corporate procurement, as previously observed.¹¹ Consequently, GoO markets are shaped by a combination of compliance-like disclosure obligations and voluntary consumption preferences.

2.3.2 Transfer, trading and cancellation mechanisms

The final step in the GoO lifecycle is cancellation (also referred to as redemption). Cancellation refers to using a certificate to substantiate a renewable electricity claim. This process may take place within the context of electricity product disclosure or corporate reporting. Once a GoO has been canceled, it cannot be traded or used again. This is intended to prevent double counting of renewable electricity attributes.¹¹ This mechanism is key to the integrity of the system. Absent the cancellation mechanism, the same renewable attribute could be sold multiple times, thereby undermining the credibility of claims regarding renewable electricity.

However, while cancellation prevents the reuse of the same certificate, integrity concerns may still arise in relation to how certificates are matched with consumption claims. Certificates are subject to scrutiny when employed to substantiate renewable consumption across temporal domains that diverge from the periods of renewable electricity generation. This discrepancy engenders inquiries into the validity of the claim’s assertion. This issue is thoroughly examined in the broader literature on temporal matching and is particularly pertinent in voluntary markets where companies seek to demonstrate renewable electricity use.⁸ The operation of GoO markets is contingent upon the implementation of “cancellation rules,” which guarantee the uniqueness of claims. However, these rules do not ensure temporal alignment between claimed renewable electricity and consumption patterns.

2.3.3 Market actors and institutional infrastructure

The functionality of GoO markets is contingent upon the dynamic interaction among various actor groups. Producers of renewable electricity are granted GoOs, which they may sell to generate additional revenue. On the demand side, electricity suppliers use GoOs to structure green electricity products and comply with disclosure requirements. Corporate buyers and other consumers may purchase GoOs to substantiate renewable electricity claims within sustainability strategies. Intermediaries—namely, brokers, traders, and platforms—play a key role in facilitating transactions and contributing to liquidity. Conversely, issuance bodies and registry operators ensure the seamless administrative functioning and compliance of the system.²³

The infrastructure of institutions plays a critical role in enabling cross-border transfers. Registries and standardized processes have been demonstrated to reduce transaction frictions and support market integration. Concurrently, residual disparities in national regulations and administrative procedures can engender impediments and contribute to market segmentation. This phenomenon contributes to the understanding of why GoO markets can demonstrate price and liquidity variations across certificate categories and geographical regions, even within a European framework.²³ In summary, GoO markets function as certificate markets built on administrative registries and disclosure requirements, with voluntary demand acting as an increasingly important driver. Figure 2 illustrates the GoO lifecycle from issuance to transfer and cancellation.

Figure 2: Lifecycle of a guarantee of origin: issuance, transfer/trading, and cancellation (own illustration)

The functionality of GoO markets provides the foundation for understanding the market outcomes discussed in later sections, particularly price formation and market performance. Given the decoupling of GoOs from physical electricity flows, demand can be driven by disclosure rules and voluntary sustainability preferences rather than by local supply conditions alone. This dynamic can contribute to robust cross-border trading and price differentiation across certificate categories.²³ Concurrently, the administrative structure of issuance and cancellation ensures that certificates provide a verifiable accounting basis for renewable electricity claims, which is the core policy intent of the instrument.³ ¹¹

A comprehensive characterization of GoO markets reveals their nature as hybrid markets, with a foundation in regulatory disclosure requirements yet an increasing influence from voluntary corporate procurement and sustainability reporting practices. The subsequent section will elaborate on this institutional description, exploring the formation of GoO prices, the performance of markets in terms of liquidity and efficiency, and the impact of regulatory uncertainty on market dynamics.

The performance of GoO markets is closely linked to the manner in which prices are formed and the degree of liquidity and transparency in trading across certificate categories and countries. While Guarantees of Origin are principally conceived as disclosure instruments, they are traded in markets where prices reflect the interaction of supply, demand, and institutional conditions. Consequently, GoO prices can be interpreted as market signals for the scarcity of renewable attributes rather than as direct signals for new renewable capacity investment. Therefore, understanding the determinants of price dynamics is essential for assessing market functionality and for interpreting corporate procurement decisions based on GoOs.²³ ²⁴

2.3.4 Determinants of GoO prices

In fundamental economic terms, GoO prices are determined by the equilibrium of certificate supply and demand. The supply of this instrument is contingent upon two factors: the volume of eligible renewable electricity generation for which certificates are issued, and the willingness of producers to sell these certificates rather than retain them. The demand for these certificates stems from two primary sources: electricity suppliers’ need for certification for green tariff products and disclosure purposes, and corporate buyers’ and other consumers’ utilization of GoOs for voluntary renewable electricity claims.¹¹ ²³ A salient feature of GoOs is their decoupling from physical electricity flows, a property that facilitates market supply sourcing across borders. This, in turn, enables buyers to procure certificates from regions characterized by high renewable energy output and potentially lower certificate prices.

It is evident that GoO prices exhibit significant variation across various certificate categories. The distinguishing characteristics of certificates include generation technology (e.g., wind, solar, hydro), country of origin, and production period. Market segmentation occurs when buyers exhibit a preference for certain technologies or countries due to reputational or reporting considerations, or when contractual and disclosure regulations render specific certificates more appealing. This segmentation has the potential to result in the perpetuation of price discrepancies between certificate categories, even within the context of a unified European system.²³ In practice, this implies that GoO markets are not “one single price market” but rather a set of interconnected sub-markets.

2.3.5 Market liquidity and transparency

The performance of a market is contingent not solely on price levels, but also on factors such as liquidity and transparency. Liquid markets facilitate the efficient trading of certificates, characterized by minimal transaction costs. Conversely, transparent markets have the capacity to diminish information asymmetries, thereby enhancing price discovery. Empirical research on European renewable certificate markets demonstrates that market performance can fluctuate over time and across countries, reflecting variations in trading volumes, participant diversity, and the degree of market intermediation.²⁴ In segments characterized by lower liquidity, price volatility can be more pronounced, and trades may be predominantly influenced by a limited number of market participants. This can result in a reduction in market efficiency.

The role of intermediaries is therefore significant. Brokers and trading platforms have the potential to enhance liquidity by facilitating the matching of buyers and sellers, reducing search costs, and enabling cross-border transactions. Concurrently, reliance on bilateral OTC trading may impede transparency, as prices and volumes are not universally observable. This dynamic can impede the ability of smaller market participants to accurately benchmark prices, potentially leading to divergent price expectations.²³ Consequently, even in the presence of certificate markets in principle, their practical performance is contingent on the institutional infrastructure surrounding trading.

2.3.6 Volatility, hedging and regulatory uncertainty

It is imperative to acknowledge that GoO prices are susceptible to fluctuations, which are influenced by both fundamental market factors and expectations regarding future demand. The volatility of renewable energy certificates (RECs) is influenced by several factors, including changes in renewable generation volumes, shifts in corporate demand, and the evolution of preferences for certificate quality, such as technology type or temporal attributes. Furthermore, regulatory developments have the potential to influence expectations regarding future market rules, thereby affecting current pricing.²⁴ ²⁵

From a market perspective, price signals can also affect investment-related risk management. A body of research has emerged that examines the role of tradable certificate systems in the context of renewable energy generation. The findings of these studies suggest that certificate prices can function as hedging instruments, thereby creating an additional revenue stream for renewable generators. However, the effectiveness of hedging is contingent upon market depth and price stability.²⁶ While GoOs differ from mandatory quota certificate schemes, the broader insight remains relevant: certificate markets can influence perceived risk and expected returns, even when they are not designed as primary investment support mechanisms.

Nevertheless, the extent to which GoOs provide meaningful investment signals remains a subject of debate. It is evident that GoO demand is frequently influenced by voluntary consumption claims as opposed to being dictated by policy-mandated targets. Consequently, the stability and predictability of demand in GoO markets may deviate from that observed in quota-based markets. Consequently, GoO price signals may exhibit reduced strength or less direct correlation with capacity expansion decisions when compared to support-oriented certificate schemes. This distinction underscores the notion that GoO price levels should be interpreted primarily as scarcity signals for renewable attributes in disclosure markets rather than as direct indicators of renewable investment incentives.³ ²³

Regulatory uncertainty has been identified as a critical factor that significantly impacts market performance. Uncertainty may emerge from modifications in regulations concerning certificate eligibility, disclosure obligations, cross-border recognition, or quality criteria. Such uncertainty has the potential to influence market expectations, thereby resulting in price fluctuations or shifts in trading volumes. This phenomenon is particularly pronounced when market participants anticipate stricter regulations or alterations in the criteria for determining acceptable renewable electricity claims.²⁵ In certificate markets more broadly, regulatory credibility and stable long-term frameworks are key determinants of investment and trading behavior. Policy changes can directly affect future certificate scarcity and market value.²⁴

Within the framework of GoOs, deliberations concerning additionality requirements or temporal matching standards have the potential to modify the perceived quality of certificates and exert influence on demand patterns. For instance, should voluntary standards shift toward more precise time matching, certificates linked to particular production periods or technologies could potentially increase in value compared to generic annual certificates. Such developments have the potential to increase market segmentation, which can result in differentiated price dynamics across certificate types.⁸ This phenomenon underscores the notion that market performance is not solely determined by the dynamics of supply and demand, but is also influenced by the evolution of standards and definitions surrounding the concept of a “high-quality” renewable electricity claim. Figure 3 illustrates the evolution of GoO market volumes over time, showcasing market growth and potential periods of volatility.²⁷

Figure 3: GoO market development issued and cancelled volumes in TWh, (own illustration based on AIB market statistics)..¹⁶

2.3.7 Summary and implications for market outcomes

In short, GoO prices are indicative of the rarity of renewable attributes within a market characterized by the confluence of disclosure-related demand and the growing significance of voluntary corporate procurement. The performance of a market is contingent upon the liquidity, transparency, and institutional infrastructure that facilitate trading and cross-border transfers. Empirical evidence indicates that certificate markets can exhibit variations in Performance across regions and certificate segments, resulting in price spreads and divergent volatility.²³ ²⁴ Furthermore, regulatory uncertainty and evolving standards have the potential to influence market expectations and contribute to shifting demand for specific certificate categories.⁸ ²⁵

The insights derived from this study lay the foundation for the subsequent analysis of the corporate use of GoOs. Corporate buyers must navigate these market conditions when selecting procurement strategies and determining the sufficiency of GoOs in meeting renewable electricity claims, or whether alternative instruments such as PPAs are necessary.

3 Practical implementation

3.1 Corporate use of guarantees of origin

3.1.1 Corporate motivations and ESG drivers

The growing use of Guarantees of Origin by companies is closely linked to the increasing importance of corporate climate strategies and sustainability reporting. As firms face growing pressure from investors, regulators, and other stakeholders to reduce their carbon footprint, the procurement of renewable electricity has become a key part of their decarbonization efforts. In this context, renewable electricity procurement has emerged as a central instrument for corporate decarbonization strategies.

Many companies have adopted climate commitments, such as net-zero targets or pledges to source 100% renewable electricity. These commitments necessitate mechanisms that enable firms to demonstrate the renewable origin of their electricity consumption. Guarantees of Origin provide this mechanism by certifying that a specific quantity of electricity was generated from renewable sources.⁴

Within corporate greenhouse gas accounting, renewable electricity procurement is particularly relevant for Scope 2 emissions. Scope 2 emissions are associated with purchased electricity. Under widely used reporting frameworks, companies can report reduced Scope 2 emissions when they procure and retire renewable electricity attributes.⁶

Beyond emission accounting, renewable electricity sourcing is also driven by broader sustainability reporting and ESG evaluation processes. ESG indicators increasingly influence corporate reputation, access to capital, and investor assessments. Therefore, transparent documentation of renewable electricity consumption plays an important role in corporate sustainability disclosure.²⁸ Guarantees of Origin enable companies to operationalize these reporting requirements. By purchasing and canceling certificates corresponding to their electricity consumption, firms can substantiate renewable electricity claims within sustainability reports and climate disclosures.⁴

In this sense, the corporate demand for GoOs is closely linked to the institutionalization of sustainability governance. As climate commitments, ESG frameworks, and disclosure standards become more widespread, renewable electricity certificates provide a practical tool for aligning corporate energy procurement with sustainability reporting requirements. Companies can implement renewable electricity procurement through different instruments and contracting models, which are discussed in the following section.

3.1.2 Procurement models (stand-alone GoOs, bundled contracts, PPAs, on-site generation)

A company can procure renewable electricity via a variety of procurement models, which differ in terms of flexibility, investment impact, and operational complexity. These models determine how renewable electricity attributes are allocated and how companies integrate renewable sourcing into their energy strategies. Guarantees of Origin assume divergent roles across these procurement approaches and frequently function as the accounting mechanism that certifies renewable electricity consumption.²⁹ ³⁰

The most flexible procurement model involves the purchase of stand-alone Guarantees of Origin. In such instances, companies procure renewable electricity certificates independently from their physical electricity supply. The electricity itself is procured from the conventional electricity market, while the certificates are obtained independently through the GoO market.

This model enables companies to align their electricity consumption with renewable attributes without modifying their existing electricity procurement arrangements. Consequently, it is extensively employed in the domains of Scope 2 accounting and sustainability reporting, notably by multinational firms operating within diverse electricity markets.⁴

The primary benefit of stand-alone GoOs is their flexibility and relatively modest expense. It is possible for companies to adjust the quantity of certificates purchased according to their electricity consumption and geographic footprint. However, given the dissociation between the certificates and the physical generation of electricity, this procurement model does not inherently generate a direct investment signal for new renewable capacity.⁵ ⁶

A secondary procurement model involves bundled electricity contracts, in which electricity supply and renewable certificates are delivered in conjunction by an electricity supplier. In this arrangement, energy providers offer green electricity tariffs that include the transfer of Guarantees of Origin corresponding to the electricity consumed.

For companies, the implementation of bundled contracts has been shown to simplify the procurement process, as the supplier assumes responsibility for the acquisition and cancellation of certificates. This model, therefore, reduces administrative complexity and allows firms to claim renewable electricity consumption through a single supply contract.

However, bundled products generally provide minimal transparency regarding the specific origin of the renewable electricity and the underlying generation assets. Consequently, companies that rely on such tariffs have reduced control over the sourcing structure of their renewable electricity procurement.⁴ ¹⁹

Corporate Power Purchase Agreements (PPAs) are a procurement model that prioritizes investment. A Power Purchase Agreement (PPA) is a type of contract between a company and a renewable electricity generator. This contract is often for a duration of ten to twenty years. These agreements ensure a predetermined or structured cost for electricity and frequently encompass the transfer of renewable certificates.

PPA programs have been demonstrated to offer revenue stability for renewable energy projects, thereby facilitating financing for new generation capacity. Consequently, they are often examined as a procurement mechanism that more directly contributes to the expansion of renewable energy compared with stand-alone certificate purchases.⁴ ⁵ From a corporate perspective, PPAs can support long-term decarbonization strategies while offering price stability for electricity procurement.

A fourth procurement model involves on-site renewable electricity generation. In such instances, corporate entities have been known to install renewable energy technologies, including solar photovoltaic systems and wind turbines, directly at their operational facilities.

On-site generation empowers companies to consume renewable electricity directly, thereby reducing their reliance on external electricity suppliers. This model has the potential to contribute to physical decarbonization and long-term energy cost stability.

However, on-site solutions are often constrained by geographic, technical, or financial limitations. However, not all companies possess the necessary locations or sufficient space for renewable installations, and the required capital investment can be significant.⁴ ¹⁹

In practice, companies frequently employ a combination of different procurement models to achieve a balance between flexibility, cost efficiency, and impact on investment. Stand-alone GoOs offer high flexibility and administrative simplicity, while PPAs and on-site generation provide stronger links to renewable capacity development.

Consequently, corporate renewable electricity strategies generally adopt a portfolio approach, integrating disclosure-oriented instruments such as GoOs with investment-oriented procurement models.

3.1.3 Role in scope 2 accounting and sustainability reporting

Corporate greenhouse gas accounting frameworks play a key role in shaping how companies measure and report their emissions. In the widely used Greenhouse Gas Protocol (GHG Protocol), electricity consumption is reported under the category of Scope 2 emissions, which refer to indirect greenhouse gas emissions associated with purchased electricity, steam, heating, or cooling.³¹ The Scope 2 accounting framework delineates two distinct reporting methods. The location-based method reflects the average emissions intensity of the electricity grid where consumption occurs, while the market-based method allows companies to report emissions based on contractual instruments that specify the origin of electricity. In the European context, Guarantees of Origin serve as the primary mechanism for documenting renewable electricity consumption under the market-based method.⁶ ⁷

Within this framework, Guarantees of Origin empower companies to substantiate claims regarding renewable electricity in their emissions reporting. By procuring and subsequently canceling certificates corresponding to their electricity consumption, firms can substantiate that the electricity they claim to use originates from renewable sources. This process ensures that renewable attributes are not counted more than once and allows companies to align their electricity procurement with climate commitments and renewable electricity targets. Consequently, GoOs offer a framework for documenting and incorporating renewable electricity consumption into corporate emissions inventories.⁴ ⁶

Beyond the scope of emissions accounting, renewable electricity certificates also serve a key function in the broader context of sustainability reporting and ESG disclosure. In the contemporary business landscape, there has been a discernible trend of companies progressively utilizing sustainability reports, climate disclosures, and investor communications as conduits to disseminate their climate strategies and energy sourcing practices. In this context, the procurement of renewable electricity by corporations can serve as a visible indicator of their climate action and environmental responsibility. Investors and ESG rating agencies are increasingly demanding transparent documentation of renewable electricity sourcing, thereby reinforcing the role of GoOs as a verifiable reporting instrument within corporate sustainability governance.⁴ ²⁸

When considered collectively, Guarantees of Origin function not only as energy market instruments but also as accounting tools, enabling companies to report renewable electricity consumption within the context of sustainability and climate reporting frameworks. Beyond the considerations relevant to reporting, companies must also evaluate the strategic implications of renewable electricity procurement decisions.

3.1.4 Strategic considerations in corporate renewable electricity procurement

The procurement decisions made by corporations regarding renewable electricity are influenced by a combination of economic, strategic, and environmental considerations. In order to optimize their purchasing decisions, companies must assess various procurement strategies in the context of cost efficiency, organizational agility, reputation management, and long-term decarbonization objectives. These factors influence the manner in which firms incorporate instruments such as Guarantees of Origin into their comprehensive sustainability and energy procurement strategies.

From an economic perspective, cost efficiency and flexibility are critical factors in determining corporate procurement of renewable electricity. Stand-alone Guarantees of Origin are frequently relatively economical and can be seamlessly integrated into existing electricity procurement structures. It has been demonstrated that companies have the capability to procure certificates in an autonomous manner, irrespective of their physical electricity supply. Furthermore, these entities possess the flexibility to modulate their procurement volumes in accordance with their electricity consumption across a variety of locations. This flexibility renders GoOs particularly appealing for multinational companies operating across multiple electricity markets, as certificates can be used to align renewable electricity claims with geographically dispersed operations.⁴ ⁵

Beyond economic considerations, the procurement of renewable electricity is also influenced by strategic positioning and reputational objectives. In the contemporary business landscape, there has been a discernible trend of companies incorporating their renewable electricity sourcing as a key component of their corporate sustainability strategies, climate commitments, and ESG reporting. Renewable electricity targets and net-zero pledges are frequently emphasized in sustainability reports and investor communications. Consequently, the procurement of renewable electricity contributes to the broader discourse on sustainability for firms and can enhance corporate credibility concerning climate commitments and stakeholder expecta-tions.⁴ ²⁸

Concurrently, renewable electricity certificates frequently constitute merely a single element of a comprehensive decarbonization strategy. A considerable number of companies employ a combination of diverse procurement strategies, encompassing the acquisition of Guarantees of Origin, long-term power purchase agreements, on-site renewable energy generation, and energy efficiency measures. While GoOs provide flexibility and allow companies to document renewable electricity consumption in the short term, long-term decarbonization strategies frequently involve investments in renewable generation capacity or structural energy system changes.⁴ ⁵ ¹⁹

The procurement of renewable electricity by corporations is, therefore, shaped by a balance between cost efficiency, flexibility, reputational considerations, and long-term decarbonization objectives. These strategic considerations also elucidate the influence of economic and institutional drivers on the adoption of Guarantees of Origin, a topic that will be analyzed in the following section.

In navigating these strategic considerations, corporations face a distinct trade-off between procurement cost and environmental impact, often conceptualized as the ‘integrity’ of the procurement construct.²⁹ Figure 4 illustrates this corporate decision-making process and the resulting integrity of different procurement constructs. Unbundled or standalone certificates offer high flexibility and low costs, but are widely criticized for possessing ‘limited’ or ‘shallow’ integrity, as they rarely contribute to additional renewable capacity on the local grid.²⁹ Conversely, long-term Power Purchase Agreements (PPAs) or on-site generation demand higher financial commitments and assume greater long-term risks, typically spanning 10 to 20 years, but offer ‘high’ integrity by directly facilitating new renewable energy investments and genuine emission reductions.²⁹ Consequently, corporate procurement strategies are increasingly evaluated not just by the sheer volume of certificates, but by the structural quality and additionality of the chosen instruments.²⁹

Figure 4: Corporate decision-making process and integrity of procurement constructs (own illustration based on NewClimate Institute).³⁰

3.1.5 Operational implementation of GoOs

From an operational perspective, the procurement of renewable energy by corporations via GoOs follows a structured, multi-step process rather than a simple transactional purchase. The preliminary phase necessitates a thorough examination of the corporation’s electricity consumption. This entails the quantification of its aggregate energy requirement and the delineation of the precise geographical locations of its operational facilities on a global scale.³² ³³ Accurate geographical tracking is imperative due to the significant variations in energy markets, grid structures, and the availability of renewable resources across different regions.

In light of the consumption profile under consideration, it is incumbent upon the organization to formulate a bespoke procurement strategy that is congruent with its overarching climate targets. Decision-makers assess the trade-offs between various procurement models, including on-site generation, long-term Power Purchase Agreements (PPAs), and the acquisition of unbundled, standalone GoOs.²⁹ ³⁰ This strategic evaluation generally balances short-term flexibility and cost parameters against long-term decarbonization goals and systemic investment impacts.³⁰

Subsequent to the formulation of the strategy, the procurement of GoOs is executed by energy suppliers or specialized certificate traders. In this phase, it is incumbent upon companies to engage in meticulous deliberation regarding the provenance, quality, and cost of the certificates. It is imperative to evaluate the underlying generation technology and ensure geographical alignment between the certificate’s origin and the company’s consumption. This is due to the fact that the integrity of the procurement construct significantly influences the credibility of the associated environmental claims.³⁴ ²⁹

After the acquisition, the most critical operational measure is the formal cancellation frequently referred to as retirement of the certificates within the respective registry. The cancellation process effectively deletes the GoO from the market, ensuring that the environmental attribute of the generated electricity is exclusively claimed by the purchasing entity and systematically preventing any double counting of the renewable attributes.³⁴ ³⁰

In conclusion, it is evident that retired certificates serve as the foundational evidence for the company’s environmental reporting. According to the Greenhouse Gas Protocol, the cancellation of GoOs enables an organization to calculate and report reduced Scope 2 emissions using the market-based accounting method.³⁴ ³⁰ As a result, the documented consumption is incorporated into the company’s annual sustainability report, thereby demonstrating quantifiable progress towards its broader Environmental, Social, and Governance (ESG) criteria and Net-Zero commitments.³² ²⁹ ³³

3.2 Drivers of GoO adoption

3.2.1 Cost efficiency and flexibility

The adoption of Guarantees of Origin in corporate renewable electricity procurement is driven by two key factors: cost efficiency and operational flexibility. A comparative analysis of renewable electricity procurement models reveals that GoOs are often procured at a relatively low cost and without the necessity of long-term contractual commitments. As these certificates can be procured separately from physical electricity supply, companies can seamlessly integrate renewable electricity attributes into their existing electricity procurement arrangements without significant structural adjustments.⁵ ²³

Another advantage of GoOs lies in their high degree of flexibility. Certificates can be procured in volumes corresponding to a company’s electricity consumption and can be adjusted over time as energy demand changes. This flexibility enables companies to swiftly adapt to evolving sustainability targets or operational requirements. Furthermore, the cross-border tradability of GoOs within the European certificate system enables multinational companies to match renewable electricity claims with consumption across geographically dispersed operations.⁴

A comparative analysis of GoOs with other procurement models, such as corporate power purchase agreements or on-site renewable generation, reveals that GoOs generally require lower financial commitments and fewer organizational resources. While long-term contracts and direct investments in renewable assets may facilitate stronger connections to capacity development, they also entail elevated levels of complexity and capital allocation. Conversely, GoOs proffer a relatively uncomplicated and extensible approach for companies aspiring to augment the proportion of renewable electricity in their energy procurement portfolios.⁵ ²³

3.2.2 Standardization and cross-border market access

The high level of standardization and the possibility of cross-border trading within the European certificate system are significant factors in the adoption of Guarantees of Origin. The GoO framework establishes a harmonized certification mechanism in which a single certificate corresponds to one megawatt-hour of electricity generated from renewable energy sources. This standardized unit facilitates the measurement, transfer, and accounting of renewable electricity attributes across diverse national electricity markets.¹¹

The operation of the system is contingent upon the existence of electronic registries that facilitate the tracking of the issuance, transfer, and cancellation of certificates. These registries ensure traceability and prevent double counting by recording each certificate throughout its lifecycle. The exchange of certificates among participating countries is facilitated by coordinated registry systems and common rules defined under European renewable energy legislation. This institutional framework enables companies to procure renewable electricity attributes even when renewable generation occurs in a different country from where the electricity is consumed.³

The combination of standardized certification and cross-border transferability supports the development of a liquid European certificate market. For companies operating on an international level, this system facilitates the procurement of renewable electricity across geographically dispersed operations while ensuring the maintenance of a consistent accounting framework. Consequently, the standardization of certificates and the potential for cross-border market access have emerged as key factors in promoting the extensive utilization of Guarantees of Origin within corporate renewable electricity procurement strategies.¹⁹

3.2.3 Growing corporate climate commitments

A significant factor contributing to the rise in the use of Guarantees of Origin is the increasing number of corporate climate commitments adopted by companies across various sectors. In recent years, numerous organizations have declared ambitious climate targets, including net-zero commitments, renewable electricity sourcing targets, and comprehensive climate neutrality strategies. These commitments are often influenced by investor expectations, regulatory developments, and the increasing importance of environmental, social, and governance (ESG) criteria in corporate decision-making.⁴ ²⁸

In the context of corporate decarbonization strategies, the procurement of renewable electricity has emerged as a key measure for mitigating greenhouse gas emissions. Electricity consumption frequently constitutes a significant proportion of a company’s indirect emissions under the Scope 2 accounting framework. Consequently, the procurement of electricity from renewable energy sources is frequently identified as a viable strategy for companies to demonstrate progress toward climate targets and emission reduction commitments.⁴ ⁶

To implement these climate commitments in practice, companies require reliable mechanisms that allow them to verify and document renewable electricity consumption. Guarantees of Origin provide such a mechanism by certifying the renewable origin of electricity generation and enabling companies to match renewable attributes with their electricity consumption. The substantiation of renewable electricity claims and the operationalization of corporate sustainability strategies can be achieved through the purchase and cancellation of certificates.³

3.2.4 Market transparency and disclosure requirements

Another significant motivator for the development and adoption of Guarantees of Origin is the necessity for transparency in electricity markets and the imperative to disclose the origin of electricity supplied to consumers. In liberalized electricity markets, electricity from different generation sources is physically mixed within the grid, making it impossible to directly trace the origin of electricity delivered to end users. To address this issue, disclosure systems were introduced to ensure that the renewable origin of electricity can be documented and communicated in a standardized manner.³

Within this framework, Guarantees of Origin function as a certification mechanism that links renewable electricity generation with electricity consumption. Each certificate represents one megawatt-hour of renewable electricity and can be issued, transferred, and cancelled through electronic registry systems. These registries serve to guarantee that renewable attributes are enumerated only once, thereby averting the occurrence of double counting of renewable electricity in electricity disclosure systems.¹¹

The utilization of GoOs thus fosters transparency within electricity markets by offering a standardized and verifiable approach for the documentation of renewable electricity generation and consumption. Electricity suppliers have the option of utilizing certificates to substantiate the proportion of their electricity products derived from renewable sources and to divulge the provenance of electricity furnished to consumers. Furthermore, the system enables the consistent documentation of renewable electricity sourcing for companies and other electricity consumers.¹⁹

Beyond the disclosure of electricity, the transparency provided by Guarantees of Origin is also relevant for sustainability reporting and investor communication. As companies increasingly report on their energy consumption and climate strategies, verifiable documentation of renewable electricity sourcing becomes important for credible sustainability disclosures and stakeholder information.⁷ Notwithstanding the aforementioned factors, the implementation and impact of Guarantees of Origin are influenced by numerous obstacles and systemic impediments.

3.3 Barriers and limitations

3.3.1 Additionality debate

One of the most frequently discussed criticisms of Guarantees of Origin concerns the question of additionality. The crux of this debate lies in determining whether the acquisition of renewable electricity certificates (RECs) effectively results in increased renewable electricity generation. The concept of additionality in the context of policy instruments and market mechanisms pertains to the notion that the implementation of such instruments or mechanisms should result in the generation of renewable energy that would not have occurred otherwise.⁶ ⁷

In the case of GoOs, critics contend that a significant proportion of certificates originate from renewable electricity plants that were constructed independently of certificate demand. Hydropower plants and other facilities with long-standing renewable energy production often generate significant quantities of certificates that can be sold in the market without necessitating additional investment. Consequently, companies may be able to claim renewable electricity consumption through certificate purchases even though their procurement does not directly contribute to the construction of new renewable capacity.⁶ ⁷

This phenomenon prompts inquiries into the correlation between emissions accounting and the subsequent decarbonization outcomes. In the context of corporate greenhouse gas accounting frameworks, it is possible for companies to report reduced Scope 2 emissions in conjunction with the procurement of renewable electricity certificates. However, if the certificates are sourced from existing renewable installations, the purchase does not necessarily lead to additional renewable generation in the electricity system.⁶

Recent studies emphasize that the climate impact of voluntary renewable electricity certificates depends on the market context and the characteristics of the underlying generation assets. While the system provides a transparent mechanism for allocating renewable attributes, the extent to which it stimulates new renewable investment remains a subject of debate in the academic literature.⁴ ¹⁹

3.3.2 Temporal mismatch and hourly matching discussions

A foundational constraint of the prevailing Guarantees of Origin (GoO) framework pertains to the temporal disconnection between renewable electricity generation and real-time electricity consumption.⁸ In the extant framework, the accounting of green electricity is predominantly reliant on annual volumetric matching. This indicates that certificates generated at any point during a year can be used to cover consumption at any other time within that same year.⁸ For instance, the prevailing regulations permit companies to use certificates from solar over-production during summer months to offset electricity consumed during winter months or at night.⁸ This annual matching approach has historically been accepted due to the prevailing perspective that temporal accuracy in electricity disclosure is often considered secondary to administrative feasibility.¹¹ As illustrated in Figure 5, this conceptual discrepancy allows companies to report full renewable coverage on paper, while masking significant physical supply gaps during winter months.

Figure 5: Conceptual comparison of annual volumetric matching versus monthly profile matching of renewable electricity (own illustration based on Bjørn et al.).⁶

However, the extensive implementation of annual matching introduces significant risks to the credibility of corporate greenhouse gas accounting and science-based targets.⁶ The Assertion that companies consume 100% renewable energy based on annual certificate purchases frequently exaggerates the extent to which global emissions are mitigated. This is due to the fact that the certificates do not accurately reflect the physical electricity flow or the real-time emission intensity of the local grid.⁶ Consequently, the reporting of significant market-based emission reductions through time-independent certificates does not inherently correspond to genuine decarbonization in the real world.⁶

Moreover, the inherent temporal discrepancy in annual accounting has been demonstrated to diminish the economic incentives necessary to enhance energy system resilience and flexibil-ity.⁸ Given that GoOs presently offer producers time-independent returns, there is minimal financial incentive to invest in battery storage systems or demand-side management, which could assist in balancing supply and demand over time.⁸ Furthermore, it has been demonstrated to diminish price signals that would otherwise incentivize off-peak renewable generation, such as the implementation of photovoltaic panels oriented westward or eastward, as opposed to the exclusive orientation towards the south, which is typically employed to optimize peak output.⁸ In order to address the aforementioned structural shortcomings, an ongoing academic and industry debate exists regarding the implementation of a closer temporal alignment, which is often referred to as granular or hourly matching.⁸ Hourly matching would accurately reflect real-time scarcity in the green electricity market, thereby raising the value of energy attribute certificates during night-time or winter hours.⁸ A transition to hourly matching would result in an increase in overall system costs. However, intermediate steps, such as quarterly matching, have the potential to enhance the system by reflecting seasonal variations and incentivizing the integration of long-term storage solutions into the certificate value chain.⁸

3.3.3 Oversupply and weak price signals

Another frequently discussed limitation of the Guarantees of Origin system pertains to the oversupply of certificates and the resulting weak price signals in the market. In numerous European countries, a significant volume of GoOs is issued from renewable electricity installations that have been operational for an extended period, particularly hydropower plants and other well-established renewable energy facilities. These installations frequently generate certificates irrespective of prevailing market demand, thereby contributing to a significant surplus of tradable renewable electricity attributes.²³

The high availability of certificates can result in relatively low market prices for GoOs. When certificate prices remain low, the additional revenue that renewable electricity producers receive from selling certificates becomes relatively limited in relation to overall project revenues. Consequently, the economic motivation engendered by certificate trading might prove inadequate to substantially impact investment decisions in novel renewable energy initiatives.²⁵

This scenario prompts considerations of the potential roles of GoOs in fostering the expansion of renewable energy sources. While the system provides a transparent mechanism for allocating renewable attributes and enabling renewable electricity claims, low certificate prices reduce the likelihood that certificate revenues alone can stimulate new renewable capacity development. Consequently, the investment impact of GoOs is contingent on market conditions and the broader policy framework within which the certificate system operates.¹⁹

3.3.4 Regulatory uncertainty

Another challenge associated with the Guarantees of Origin system concerns regulatory uncertainty and the evolving policy environment in which the certificate market operates. The design and functionality of the GoO framework are closely associated with European energy and climate policy. Consequently, alterations in regulatory frameworks may influence the issuance, trade, and utilization of certificates within corporate sustainability strategies.

Policy developments at the European level, including revisions of renewable energy legislation and discussions about future design adjustments, contribute to an environment in which market participants must continuously adapt to changing regulatory conditions. Moreover, methodological debates concerning greenhouse gas accounting and renewable electricity certification may result in further modifications to the evaluation of renewable electricity claims within corporate reporting frameworks.⁸

This creates a state of uncertainty that can impede the ability of companies and investors to engage in long-term planning. In the event of alterations to regulatory frameworks, accounting standards, or certificate eligibility criteria, the economic value and strategic role of GoOs may also undergo modification. This uncertainty may affect expectations regarding certificate prices, compliance requirements, and the future role of certificate markets within the broader decarbonization policy landscape.²⁵

Consequently, regulatory uncertainty has the potential to influence corporate renewable electricity procurement decisions and investment strategies. Companies may hesitate to rely heavily on instruments whose regulatory framework could evolve in response to changing climate policy priorities or market design reforms.¹⁹

3.3.5 Greenwashing and credibility concerns

Beyond the economic and regulatory challenges, the use of Guarantees of Origin has also generated debate regarding the credibility of claims pertaining to renewable electricity. Critics contend that companies may rely on renewable electricity certificates to convey ambitious sustainability commitments without necessarily implementing significant changes in energy production or consumption patterns. In this context, the use of certificates has been associated with potential greenwashing risks. The primary concern is that companies may be able to claim renewable electricity consumption through certificate purchases even when their actual electricity supply remains linked to the conventional electricity mix. As these certificates are traded independently from the physical electricity flows, firms may present their electricity use as renewable while the underlying electricity system continues to rely on a combination of different generation sources. The distinction between accounting-based renewable electricity claims and physical decarbonization has been highlighted in several studies examining the environmental integrity of renewable electricity certificates.⁶ ⁷

These credibility concerns assume particular relevance in the context of corporate sustainability communication. Companies are increasingly disclosing their renewable electricity sourcing as part of sustainability reports, climate transition strategies, and investor communications. If stakeholders perceive that renewable electricity claims are primarily based on certificate purchases without broader decarbonization efforts, this may undermine trust in corporate sustainability narratives and affect ESG evaluations.²⁸

Consequently, greenwashing concerns underscore the need for transparency, methodological clarity, and reliable reporting. Corporate renewable electricity claims must be accurately documented and communicated to maintain stakeholder confidence.⁷

3.4 Structural design limitations of the GoO system

As discussed in the preceding sections, the barriers and practical shortcomings identified are not merely transient market imperfections; rather, they are structural limitations embedded deeply in the regulatory design of the Guarantees of Origin (GoO) system.

3.4.1 Disclosure versus investment incentives

In short, the fundamental purpose of GoOs was to serve as a financial and accounting instrument, with the objective of preventing double counting. This objective was prioritized over its role as a financial support mechanism intended to stimulate new investments in capacity.¹¹

The system’s design, in which environmental attributes are assigned ex post, engenders the frequently criticized lack of additionality as a direct consequence of the regulatory design. This design empowers consumer choice while not inherently mandating system transformation.¹¹

3.4.2 The decoupling of physical and virtual markets

Another structural limitation is attributed to the physical indistinguishability of electricity within a shared grid network.¹⁸ This necessitates a “book and claim” system, where the environmental attributes are traded completely independently of the physical electron flow.¹⁸ The decoupling of physical and virtual markets facilitates temporal and geographical mismatches in corporate procurement.

The pervasive reliance on annual matching standards signifies a deliberate regulatory trade-off, wherein temporal accuracy in electricity disclosure has historically been subordinated to administrative feasibility.¹¹

3.4.3 Systemic risks of dual reporting

In conclusion, the governance and credibility challenges associated with GoOs are compounded by the prevailing dual reporting standards.⁶ The utilization of market-based accounting, which relies on certificates, in conjunction with location-based accounting, which relies on grid averages, within the same geographic regions gives rise to structural risks of double counting.⁶ Attributes might be claimed by one corporation via certificates while still implicitly lowering the perceived emission intensity of the residual grid for other consumers who do not actively purchase certificates.¹⁹

In short, while the GoO system does facilitate critical transparency, its structural separation of physical and virtual markets precludes its ability to single-handedly promote a physical decarbonization of the energy system in the absence of complementary, investment-driven energy policies.

3.5 Overall assessment and implications

3.5.1 Evaluation of GoOs as a disclosure instrument

This subsection evaluates Guarantees of Origin based on their original normative purpose. Rather than treating GoOs as an investment instrument, the assessment examines whether they perform effectively according to their intended regulatory design. The evaluation proceeds along two dimensions: the clarity of their normative objective and their effectiveness as a transparency mechanism. GoOs were introduced as a transparency instrument within the European renewable energy framework. Their primary objective is to certify the renewable origin of electricity, prevent double counting, and enable standardized tracking across member states. GoOs function as electronic certificates representing one megawatt-hour of renewable generation and can be transferred independently of physical electricity flows.

Within RED II and RED III, Guarantees of Origin (GoOs) are explicitly defined as disclosure instruments rather than renewable support mechanisms.³⁵ Their purpose is to ensure traceability and comparability in liberalized electricity markets, not to directly stimulate new generation capacity. Previous analyses of European certificate systems have also emphasized their role as harmonized tracking instruments rather than drivers of investment.³ ¹¹

From a regulatory design perspective, GoOs’ intended function is clearly defined: they provide a common framework for attributing renewable electricity generation to consumption within the internal market. When evaluated based on this design objective, the system performs largely as intended. The registry structure ensures that certificates are issued, transferred, and canceled in a traceable manner. Double counting is prevented through cancellation requirements and cross-border coordination mechanisms.¹¹ Standardization at the EU level supports interoperability across member states and enables cross-border trading.

The widespread corporate adoption of Guarantees of Origin indicates acceptance of the system within the market. Significant expansion of corporate renewable procurement suggests that firms consider the system reliable enough for sustainability reporting and disclosure purposes.⁴ Recent assessments confirm that the GoO framework provides a harmonized accounting infrastructure across Europe as renewable energy use increases.¹⁹

Within their designated regulatory scope, GoOs effectively operate as transparency and allocation mechanisms. However, certain functional boundaries become visible even within their normative design. Separating renewable attributes from physical electricity flows creates geographic decoupling between generation and consumption. While this flexibility improves tradability, it weakens the connection between renewable claims and local system effects.⁸

Temporal decoupling between generation and consumption limits the extent to which annual certificate matching reflects real-time system conditions. While this does not undermine accounting consistency, it raises questions about the extent to which the system is represented.⁸

Furthermore, governance discussions suggest that perception issues and methodological debates could impact the legitimacy of renewable claims under specific circumstances.⁷ The distinction between accounting-based emission reductions and physical decarbonization remains central to this debate.⁶ These limitations do not contradict the system’s transparency function. Rather, they demonstrate that the effectiveness of disclosure does not automatically translate into broader climate impact.

Taken together, the analyses indicate that Guarantees of Origin fulfill their core normative purpose to a significant extent. They provide a standardized, traceable, and harmonized Framework for disclosing renewable electricity across the European Union. At the same time, the evaluation clarifies a conceptual boundary: transparency should not be equated with transformation. GoOs are institutionally robust as a disclosure mechanism. However, their broader climate relevance depends on complementary policy instruments, corporate procurement strategies, and evolving governance standards. In this sense, Guarantees of Origin are effective within their intended design logic yet limited in their capacity to independently drive structural decarbonization.

3.5.2 Alignment with EU climate and energy policy objectives

While Section 3.5.1 examined whether Guarantees of Origin (GoOs) fulfill their transparency function as designed, this subsection shifts the focus to the broader European decarbonization framework. Rather than asking whether GoOs function properly as disclosure instruments, we ask how they position themselves within the EU’s overall climate strategy and policy architecture. The European climate framework centers on the European Green Deal, the “Fit for 55” legislative package, and the legally binding goal of achieving climate neutrality by 2050 Interim targets require substantially increasing the share of renewable energy by 2030 under RED II and its revision, RED III.³⁵

Within this framework, GoOs are legally embedded but not defined as primary steering instruments. RED II and RED III establish rules for issuance, transfer, and cancellation; however, they do not assign GoOs the function of driving renewable capacity expansion.³⁵ Historically, capacity growth in Europe has been driven by targeted support schemes rather than certificate-based tracking systems.³ More recent assessments likewise describe GoOs as an accounting and allocation layer within the renewable energy framework rather than as a structural policy lever.¹⁹ Accordingly, GoOs occupy a supporting position within the EU climate architecture. They enhance system transparency, but they do not determine the direction of renewable expansion. A clearer understanding of system alignment emerges when examining the interaction between Guarantees of Origin (GoOs) and renewable energy policies.

The deployment of renewables has primarily been stimulated by feed-in tariffs, auction systems, contracts for difference, and other national instruments designed to create Investment stability and correct market failures.¹³ Comparative policy analyses demonstrate that these instruments are explicitly designed to influence investment decisions and accelerate capacity de-ployment.³ ¹¹ GoOs do not provide guaranteed remuneration or revenue certainty. They operate alongside support schemes but do not replace them. Their function is ex post certification rather than ex ante investment steering.

In systemic terms, Guarantees of Origin constitute an informational and accounting layer within a policy-driven expansion regime. They interact with support instruments, but they do not substitute for their investment function. Therefore, the contribution of GoOs to EU climate targets must be considered indirect and conditional. Significant expansion of corporate renewable procurement may signal a long-term market preference for renewable electricity.⁴ This type of demand can reinforce political visibility and contribute to the normalization of renewable sourcing. However, certificate procurement does not automatically lead to the development of additional capacity. The distinction between reported emission reductions and physical decarbonization remains central.⁶ Furthermore, governance analyses indicate that the climate relevance of voluntary certificate markets depends heavily on institutional design and integrity standards.⁷ Temporal considerations also influence alignment. For example, annual matching frameworks may not fully reflect real-time system decarbonization needs, which limits the depth of physical system integration.⁸

Thus, GoOs can amplify renewable demand signals; however, they do not guarantee structural transformation. Their contribution to the 2030 and 2050 targets depends on the effectiveness with which voluntary demand interacts with investment support mechanisms and regulatory safeguards. Therefore, demand articulation should be understood as a reinforcing mechanism rather than a primary driver of capacity expansion. Ongoing reform discussions explore whether closer alignment with EU climate objectives could enhance systemic relevance. Proposals such as granular or hourly matching aim to reduce temporal decoupling and strengthen the connection between renewable energy claims and actual system conditions.⁸ Other debates focus on stricter integrity standards and clearer methodological boundaries to preserve coherence within sustainability reporting frameworks.⁸ ¹³

These adjustments could increase consistency between accounting practices and physical system dynamics. Nevertheless, even under refined design conditions, the role of GoOs would remain embedded within — and dependent upon — the broader climate policy architecture. Within the European decarbonization framework, Guarantees of Origin can be characterized as a transparency mechanism that enables policy-driven transformation. While they support traceability and demand articulation, the direction and pace of decarbonization are primarily determined by investment-oriented policy instruments and carbon pricing frameworks. This systemic positioning directly affects how the instrument is interpreted and applied at the corporate level, a topic examined in the following subsection.

3.5.3 Implications for corporate sustainability strategies

While Sections 3.5.1 and 3.5.2 evaluated the functional logic and policy alignment of Guarantees of Origin, this section translates the analysis into strategic implications for corporate sustainability management. The central question is no longer whether GoOs function as designed, but how they should be positioned within a coherent corporate decarbonization strategy.

The preceding analysis suggests a necessary repositioning of Guarantees of Origin in the corporate context. GoOs are not a transformation instrument per se. They primarily serve as a disclosure and accounting mechanism. Their strategic relevance depends on how they are embedded within broader sustainability and investment frameworks. Corporate renewable procurement has expanded significantly, particularly among firms pursuing Net-Zero commitments.⁴ Procurement decisions are frequently shaped by flexibility, cost efficiency, and compatibility with sustainability reporting frameworks rather than long-term asset development objectives.⁵

At the same time, reliance on certificate-based Scope 2 accounting may not always correspond to structural emission reductions.⁶ Governance analyses further underline legitimacy challenges in voluntary certificate markets.⁷ In summary, GoOs are a necessary but not sufficient component of corporate climate strategy. While they enable consistent emissions accounting and market-based allocation of renewable attributes, they do not automatically ensure physical decarbonization.

Reliance on GoOs alone may also create strategic risks. Companies may face reputational exposure if certificate-based claims are not perceived as sufficiently linked to real-world Emission reductions. Additionally, regulatory adjustments, such as those regarding accounting standards or integrity criteria, could affect long-term procurement planning.⁸ Therefore, their strategic function is context-dependent; they enhance disclosure credibility but do not replace investment-oriented transition measures. Not all companies pursue the same sustainability strategies. The role of GoOs varies depending on corporate orientation. Compliance-oriented firms primarily aim to meet regulatory or disclosure requirements. For these firms, GoOs may be a cost-efficient, administratively straightforward solution.

Reputation-oriented firms focus on stakeholder perception and Environmental, Social, and Governance (ESG) evaluations. For these firms, the methodological robustness and defensibility of renewable claims become increasingly relevant, particularly as sustainability disclosure becomes more important in capital markets.²⁸

Transformation-oriented firms pursue structural decarbonization that goes beyond accounting metrics. For these firms, relying exclusively on GoOs is unlikely to be sufficient. Instead, renewable procurement must be linked to long-term investment strategies and physical system change.⁴ These differentiated corporate pathways directly influence procurement decisions. The analysis indicates that renewable procurement strategies should not rely on a single instrument. GoOs provide high flexibility, low transaction costs, and scalability for operations that are geographically dispersed. They are particularly well-suited for short-term balancing and aligning with sustainability metrics.⁵

In contrast, Power Purchase Agreements (PPAs) can provide long-term revenue certainty for renewable projects, thereby contributing more directly to new capacity development.⁴ On-site generation integrates renewable capacity directly into corporate operations, strengthening structural decarbonization. The strategic distinction lies in capital commitment. GoOs primarily allocate renewable attributes. PPAs and on-site installations, however, contribute to asset formation and long-term capital deployment. Therefore, a coherent corporate sustainability strategy requires a mix of instruments that align accounting tools with investment decisions and long-term capital allocation.

Finally, the analysis has governance implications. Emissions accounting does not automatically equate to climate impact. Disclosure mechanisms can enhance comparability and oversight.

However, without integrity standards and investment linkage, they risk becoming compliance-driven exercises.⁷ Further methodological refinement, such as improved temporal alignment or stricter accounting standards, may influence stakeholder expectations and corporate reporting practices.⁸

Regarding corporate sustainability governance, certificate procurement should be embedded in broader transition roadmaps that address physical emission sources, long-term transformation planning, and capital allocation priorities. At the strategic level, the managerial implication is clear. Although Guarantees of Origin can strengthen the consistency and accountability of renewable electricity claims, credible climate leadership requires embedding them within investment oriented decarbonization pathways rather than relying on them as standalone accounting instruments.

3.5.4 Trade-offs between flexibility, credibility and investment impact

The preceding subsections evaluated Guarantees of Origin (GoOs) based on their normative design, position in the EU climate architecture, and implications for corporate strategy. This subsection synthesizes these findings by explicitly identifying the structural trade-offs that arise from the design and implementation of GoOs. The guiding question is: What tensions arise between flexibility, credibility, and investment impact in the functioning of GoOs? As illustrated in Figure 6, the GoO system faces a structural trilemma where maximizing one of these core objectives inherently compromises the others.

Figure 6: The structural trade-offs between flexibility, credibility, and investment impact in the GoO system (own illustration).

Finally, the identification of these systemic trade-offs highlights significant avenues for future research. While recent techno-economic modelling has explored the theoretical impacts of hourly matching, there remains a critical gap regarding empirical, ex-post evaluations of how granular certificate markets perform in practice and whether they definitively trigger new physical investments.⁷ Furthermore, as global policy landscapes grow more complex, the interactive effects and coupling mechanisms between voluntary certificate markets, mandatory Renewable Portfolio Standards (RPS), and Carbon Emission Trading (CET) systems require deeper academic investigation to fully understand multi-market equilibriums and prevent overlapping regulations from diluting investment signals.²¹

The defining strength of Guarantees of Origin is their flexibility. They can be traded across borders, procured through short-term contracts, and scaled across multinational corporate operations. This flexibility has facilitated widespread corporate adoption and rapid market growth.⁴ Procurement decisions are often shaped by adaptability, cost efficiency, and compatibility with reporting frameworks.⁵ However, this flexibility can weaken long-term investment commitment. Certificate prices are generally modest compared to total project revenues, providing neither stable nor predictable cash flows comparable to those of dedicated support instruments.²³ In contrast, feed-in tariffs and auction-based mechanisms are explicitly designed to secure capital investment and reduce financing risk.³

Thus, a structural trade-off becomes apparent. The easier an instrument is to access and scale, the lower its capacity to bind capital and generate strong investment signals. Flexibility improves usability but reduces investment depth. A second tension arises between market scalability and perceived credibility. The GoO system is designed to function across member states, enabling a broad, liquid market. Such scalability increases market participation and supports widespread renewable claims. However, large and liquid markets also intensify scrutiny. Scope 2 accounting practices have been criticized for permitting reported emission reductions without corresponding physical decarbonization.⁶ Governance analyses emphasize that voluntary certificate markets require continuous methodological robustness to maintain legitimacy.⁷

Temporal decoupling between generation and consumption contributes to the ongoing debate about system representativeness.⁸ Thus, the structural tension lies in the relationship between market expansion and methodological scrutiny. While greater scalability increases accessibility and standardization, it also amplifies credibility debates and integrity expectations. A third, more fundamental trade-off concerns the relationship between transparency and transformation. Guarantees of Origin were introduced as disclosure instruments. According to this design logic, they are effective in enabling traceable and harmonized renewable energy accounting across the EU.¹⁹ However, transparency does not automatically produce structural decarbonization. The distinction between accounting consistency and physical system transformation remains central.⁶

This reflects a deeper institutional boundary. Transparency is a prerequisite for credible governance; however, it cannot substitute for investment-oriented climate policy or capital allocation decisions. The strength of GoOs as a harmonized tracking mechanism simultaneously limits their capacity to function as transformative investment drivers. Taken together, these tensions demonstrate that the design strengths and limitations of Guarantees of Origin are structurally linked. Their flexibility facilitates corporate adoption but weakens investment commitment. Their scalability increases market participation but intensifies credibility debates. Their transparency supports governance but does not guarantee physical transformation. These trade-offs do not render the instrument invalid. Rather, they define the boundaries within which it operates. Understanding these structural tensions is essential to interpreting the policy role of GoOs and their strategic application at the corporate level.

References

1
Fouquet, D. & Nysten, J. V. Guarantees of Origin and Green Electricity Certificates in Flanders and in Sweden – national design weaknesses or violation of European rules? Eur. Energy Clim. J. 3, 72–79 (2013).
2
Kanellakis, M., Martinopoulos, G. & Zachariadis, T. European energy policy—A review. Energy Policy 62, 1020–1030 (2013).
3
Ragwitz, M., del Río González, P. & Resch, G. Assessing the advantages and drawbacks of government trading of guarantees of origin for renewable electricity in Europe. Energy Policy 37, 300–307 (2009).
4
Paris, A., Hechelmann, R.-H. & Buchenau, N. Exploring the effect of Guarantees of Origin on the decarbonization of corporate electricity procurement: A case study of Germany and Norway. J. Ind. Ecol. 28, 1657–1669 (2024).
5
Calikoglu, U. & Aydinalp Koksal, M. Green electricity and Renewable Energy Guarantees of Origin demand analysis for Türkiye. Energy Policy 170, 113229 (2022).
6
Bjørn, A., Lloyd, S. M., Brander, M. & Matthews, H. D. Renewable energy certificates threaten the integrity of corporate science-based targets. Nat. Clim. Change 12, 539–546 (2022).
7
Langer, L. et al. Does the purchase of voluntary renewable energy certificates lead to emission reductions? A review of studies quantifying the impact. J. Clean. Prod. 478, 143791 (2024).
8
Blaschke, M. J. & Scholta, H. F. Shedding Light on Green Claims: The Impact of a Closer Temporal Alignment of Supply and Demand in Voluntary Green Electricity Markets. (2024).
9
Toke, D. Are Green Electricity Certificates the Way Forward for Renewable Energy? An Evaluation of the United Kingdom’s Renewables Obligation in the Context of International Comparisons. Environ. Plan. C Gov. Policy 23, 361–374 (2005).
10
Ringel, M. Fostering the use of renewable energies in the European Union: the race between feed-in tariffs and green certificates. Renew. Energy 31, 1–17 (2006).
11
Raadal, H. L., Dotzauer, E., Hanssen, O. J. & Kildal, H. P. The interaction between Electricity Disclosure and Tradable Green Certificates. Energy Policy 42, 419–428 (2012).
12
Nielsen, L. & Jeppesen, T. Tradable Green Certificates in selected European coun-tries—overview and assessment. Energy Policy 31, 3–14 (2003).
13
origin for Europe’s renewable energy targets. Renew. Sustain. Energy Rev. 205, 114850 (2024).
14
Menanteau, P., Finon, D. & Lamy, M.-L. Prices versus quantities: choosing policies for promoting the development of renewable energy. Energy Policy 31, 799–812 (2003).
15
Ganhammar, K. The effect of regulatory uncertainty in green certificate markets: Evidence from the Swedish-Norwegian market. Energy Policy 158, 112583 (2021).
16
Annual reports overview | AIB. https://www.aib-net.org/news-events/annual-re-ports?year=2024.
17
Darmani, A., Rickne, A., Hidalgo, A. & Arvidsson, N. When outcomes are the reflection of the analysis criteria: A review of the tradable green certificate assessments. Renew. Sustain. Energy Rev. 62, 372–381 (2016).
18
Morthorst, P. E. National environmental targets and international emission reduction instruments. Energy Policy 31, 73–83 (2003).
19
Holzapfel, P. K. R., Bánk, J., Bach, V. & Finkbeiner, M. Relevance of guarantees of
20
Chen, K.-T. & Jou, S.-C. Institutional frameworks for renewable energy certificates: Insights from Japan and South Korea. Energy Rep. 13, 5792–5801 (2025).
21
Voluntary Renewable Power Procurement | Energy Systems Analysis | NREL The State of the U.S. Voluntary Power Market (2024 Data). https://www.nrel.gov/analysis/renewable-power (2025).
22
Wang, Y., Wang, B. & Cui, L. Applauded not acclaimed? Implementation effectiveness of the tradable green certificate in renewable energy policy of China. Energy Econ. 145, 108504 (2025).
23
Google LLC. 2023 Environmental Report. https://sustainability.google/reports/google-2023-environmental-report/ (2023).
24
Wimmers, A. & Madlener, R. The European Market for Guarantees of Origin for Green Electricity: A Scenario-Based Evaluation of Trading under Uncertainty. Energies 17, 104 (2024).
25
Helgesen, P. I. & Tomasgard, A. An equilibrium market power model for power markets and tradable green certificates, including Kirchhoff’s Laws and Nash-Cournot competition. Energy Econ. 70, 270–288 (2018).
26
Hulshof, D., Jepma, C. & Mulder, M. Performance of markets for European renewable energy certificates. Energy Policy 128, 697–710 (2019).
27
Science Based Targets initiative (SBTi). Evidence Synthesis on Environmental Attribute Certificates. https://files.sciencebasedtargets.org/production/files/Evidence-Synthesis-Re-port-Part-2-Environmental-Attribute-Certificates-Electricity.pdf (2025).
28
Huang, G. et al. Do Tradable Green Certificates Promote Regional Carbon Emissions Reduction for Sustainable Development? Evidence from China. Sustainability 16, 7335 (2024).
29
De Villiers, C., Principale, S., Galeotti, R. M. & Cicchini, D. Accounting for Renewable Energy: Investigating Emerging Topics and Research Pathways. Bus. Strategy Environ. 34, 4597–4621 (2025).
30
NewClimate Institute. Navigating the Nuances of Corporate Renewable Electricity Procurement. https://newclimate.org/resources/publications/navigating-the-nuances-of-corpo-rate-renewable-electricity-procurement (2024).
31
Wills, T. Corporate Procurement of Renewable Energy: Implications and Considerations. https://www.theccc.org.uk/publication/corporate-procurement-of-renewable-energy-im-plications-and-considerations/ (2020).
32
Bergek, A. & Jacobsson, S. Are tradable green certificates a cost-efficient policy driving technical change or a rent-generating machine? Lessons from Sweden 2003–2008. Energy Policy 38, 1255–1271 (2010).
33
Scope 2 Guidance | GHG Protocol. https://ghgprotocol.org/scope-2-guidance.
34
Amundsen, E. S. & Mortensen, J. B. The Danish Green Certificate System: Some Simple Analytical Results. Energy Econ. 23, 489–509 (2001).
35
2025 Environmental Sustainability Report | Microsoft. Corporate Responsibility

1
Fouquet, D. & Nysten, J. V. Guarantees of Origin and Green Electricity Certificates in Flanders and in Sweden – national design weaknesses or violation of European rules? Eur. Energy Clim. J. 3, 72–79 (2013).
2
Kanellakis, M., Martinopoulos, G. & Zachariadis, T. European energy policy—A review. Energy Policy 62, 1020–1030 (2013).
3
Ragwitz, M., del Río González, P. & Resch, G. Assessing the advantages and drawbacks of government trading of guarantees of origin for renewable electricity in Europe. Energy Policy 37, 300–307 (2009).
4
Paris, A., Hechelmann, R.-H. & Buchenau, N. Exploring the effect of Guarantees of Origin on the decarbonization of corporate electricity procurement: A case study of Germany and Norway. J. Ind. Ecol. 28, 1657–1669 (2024).
5
Calikoglu, U. & Aydinalp Koksal, M. Green electricity and Renewable Energy Guarantees of Origin demand analysis for Türkiye. Energy Policy 170, 113229 (2022).
6
Bjørn, A., Lloyd, S. M., Brander, M. & Matthews, H. D. Renewable energy certificates threaten the integrity of corporate science-based targets. Nat. Clim. Change 12, 539–546 (2022).
7
Langer, L. et al. Does the purchase of voluntary renewable energy certificates lead to emission reductions? A review of studies quantifying the impact. J. Clean. Prod. 478, 143791 (2024).
8
Blaschke, M. J. & Scholta, H. F. Shedding Light on Green Claims: The Impact of a Closer Temporal Alignment of Supply and Demand in Voluntary Green Electricity Markets. (2024).
9
Toke, D. Are Green Electricity Certificates the Way Forward for Renewable Energy? An Evaluation of the United Kingdom’s Renewables Obligation in the Context of International Comparisons. Environ. Plan. C Gov. Policy 23, 361–374 (2005).
10
Ringel, M. Fostering the use of renewable energies in the European Union: the race between feed-in tariffs and green certificates. Renew. Energy 31, 1–17 (2006).
11
Raadal, H. L., Dotzauer, E., Hanssen, O. J. & Kildal, H. P. The interaction between Electricity Disclosure and Tradable Green Certificates. Energy Policy 42, 419–428 (2012).
12
Nielsen, L. & Jeppesen, T. Tradable Green Certificates in selected European coun-tries—overview and assessment. Energy Policy 31, 3–14 (2003).
13
origin for Europe’s renewable energy targets. Renew. Sustain. Energy Rev. 205, 114850 (2024).
14
Menanteau, P., Finon, D. & Lamy, M.-L. Prices versus quantities: choosing policies for promoting the development of renewable energy. Energy Policy 31, 799–812 (2003).
15
Ganhammar, K. The effect of regulatory uncertainty in green certificate markets: Evidence from the Swedish-Norwegian market. Energy Policy 158, 112583 (2021).
16
Annual reports overview | AIB. https://www.aib-net.org/news-events/annual-re-ports?year=2024.
17
Darmani, A., Rickne, A., Hidalgo, A. & Arvidsson, N. When outcomes are the reflection of the analysis criteria: A review of the tradable green certificate assessments. Renew. Sustain. Energy Rev. 62, 372–381 (2016).
18
Morthorst, P. E. National environmental targets and international emission reduction instruments. Energy Policy 31, 73–83 (2003).
19
Holzapfel, P. K. R., Bánk, J., Bach, V. & Finkbeiner, M. Relevance of guarantees of
20
Chen, K.-T. & Jou, S.-C. Institutional frameworks for renewable energy certificates: Insights from Japan and South Korea. Energy Rep. 13, 5792–5801 (2025).
21
Voluntary Renewable Power Procurement | Energy Systems Analysis | NREL The State of the U.S. Voluntary Power Market (2024 Data). https://www.nrel.gov/analysis/renewable-power (2025).
22
Wang, Y., Wang, B. & Cui, L. Applauded not acclaimed? Implementation effectiveness of the tradable green certificate in renewable energy policy of China. Energy Econ. 145, 108504 (2025).
23
Google LLC. 2023 Environmental Report. https://sustainability.google/reports/google-2023-environmental-report/ (2023).
24
Wimmers, A. & Madlener, R. The European Market for Guarantees of Origin for Green Electricity: A Scenario-Based Evaluation of Trading under Uncertainty. Energies 17, 104 (2024).
25
Helgesen, P. I. & Tomasgard, A. An equilibrium market power model for power markets and tradable green certificates, including Kirchhoff’s Laws and Nash-Cournot competition. Energy Econ. 70, 270–288 (2018).
26
Hulshof, D., Jepma, C. & Mulder, M. Performance of markets for European renewable energy certificates. Energy Policy 128, 697–710 (2019).
27
Science Based Targets initiative (SBTi). Evidence Synthesis on Environmental Attribute Certificates. https://files.sciencebasedtargets.org/production/files/Evidence-Synthesis-Re-port-Part-2-Environmental-Attribute-Certificates-Electricity.pdf (2025).
28
Huang, G. et al. Do Tradable Green Certificates Promote Regional Carbon Emissions Reduction for Sustainable Development? Evidence from China. Sustainability 16, 7335 (2024).
29
De Villiers, C., Principale, S., Galeotti, R. M. & Cicchini, D. Accounting for Renewable Energy: Investigating Emerging Topics and Research Pathways. Bus. Strategy Environ. 34, 4597–4621 (2025).
30
NewClimate Institute. Navigating the Nuances of Corporate Renewable Electricity Procurement. https://newclimate.org/resources/publications/navigating-the-nuances-of-corpo-rate-renewable-electricity-procurement (2024).
31
Wills, T. Corporate Procurement of Renewable Energy: Implications and Considerations. https://www.theccc.org.uk/publication/corporate-procurement-of-renewable-energy-im-plications-and-considerations/ (2020).
32
Bergek, A. & Jacobsson, S. Are tradable green certificates a cost-efficient policy driving technical change or a rent-generating machine? Lessons from Sweden 2003–2008. Energy Policy 38, 1255–1271 (2010).
33
Scope 2 Guidance | GHG Protocol. https://ghgprotocol.org/scope-2-guidance.
34
Amundsen, E. S. & Mortensen, J. B. The Danish Green Certificate System: Some Simple Analytical Results. Energy Econ. 23, 489–509 (2001).
35
2025 Environmental Sustainability Report | Microsoft. Corporate Responsibility