Competition Law and Carbon Credit Trading Market Concentration

1. Introduction

Carbon-credit trading markets are developing rapidly as governments, exchanges, financial institutions, project developers, brokers, technology platforms, and large corporate buyers participate in the creation, verification, trading, retirement, and financing of carbon credits.

From a competition-law perspective, market concentration becomes important where a small number of undertakings control a substantial share of:

• carbon-credit issuance;
• verification and certification;
• carbon-credit registries;
• exchanges and trading platforms;
• brokerage and aggregation;
• carbon-credit project development;
• corporate procurement;
• carbon-market data and benchmarks; or
• infrastructure necessary to access the market.

A particularly important distinction is between emission allowances, such as EU Allowances (EUAs), and voluntary carbon credits/offsets. Existing competition-law precedent is substantially richer for emissions allowances and adjacent carbon markets than for voluntary carbon-credit markets themselves. Therefore, several of the cases below are direct carbon-market precedents, while others provide important competition-law principles applicable by analogy.

The European Commission has expressly treated CO₂ allowance trading as a distinct market in its merger practice and has generally considered the geographic market to be EU-wide.

2. Meaning of Market Concentration in Carbon-Credit Trading

Market concentration refers to the extent to which market activity is controlled by a relatively small number of firms.

In carbon markets, concentration can arise at several different levels:

A. Trading-platform concentration

A small number of exchanges may control access to carbon-credit trading.

B. Broker concentration

A handful of brokers may intermediate a significant proportion of transactions.

C. Registry concentration

A single registry or a few registries may control the recording and retirement of credits.

D. Certification concentration

A limited number of verification and certification bodies may determine whether carbon credits can enter the market.

E. Project-developer concentration

Large developers may control substantial portfolios of high-quality credits.

F. Buyer concentration

Large corporations may collectively account for a substantial proportion of purchases from particular project categories.

G. Vertical concentration

The same undertaking may control several stages:

Project development → verification → certification → registry → exchange → brokerage → corporate purchasing.

This is potentially more problematic than simple horizontal concentration because vertical integration can create opportunities for foreclosure and discriminatory access.

3. Why Carbon-Credit Markets Raise Special Competition Issues

Carbon credits are not completely homogeneous products.

Two credits may each represent one tonne of CO₂-equivalent reduction or removal but differ substantially according to:

• permanence;
• additionality;
• methodology;
• geographical location;
• verification standard;
• vintage;
• project type;
• biodiversity or social co-benefits;
• corresponding-adjustment status;
• registry;
• reputational risk; and
• eligibility under particular regulatory schemes.

Consequently, conventional market-share analysis can be insufficient.

A competition authority may have to determine whether the relevant market consists of:

1. all carbon credits;
2. voluntary carbon credits;
3. compliance allowances;
4. removal credits;
5. avoidance credits;
6. nature-based credits;
7. engineered-removal credits;
8. credits satisfying a particular standard; or
9. credits accepted for a particular regulatory purpose.

4. Relevant Market Definition

4.1 Product market

A competition authority would ordinarily investigate whether different carbon instruments are substitutable.

For example:

Market A: All voluntary carbon credits

versus

Market B: High-integrity nature-based removal credits

versus

Market C: Permanently stored engineered carbon-removal credits.

The narrower the market, the greater the possibility that concentration will become significant.

The European Commission's carbon-market merger practice is particularly relevant because it has treated CO₂ allowance/emission-right trading as a separate product market. In its earlier merger analysis, the Commission considered EUAs and potentially Kyoto Certified Emission Reductions (CERs), while leaving the precise relationship open.

5. Geographic Market

The relevant geographic market may be:

• local;
• national;
• regional;
• EU-wide; or
• global.

Carbon trading can be inherently international because credits can be generated in one country and purchased by companies located elsewhere.

For EU CO₂ allowance trading, Commission practice has treated the market as EU-wide.

For voluntary carbon credits, however, geographic scope can be more complicated because eligibility, registry recognition, national carbon rules, Article 6 requirements and corresponding adjustments may restrict substitutability.

6. Competition Risks Created by Concentration

A. Higher transaction costs

A dominant exchange or broker may impose higher:

• commissions;
• clearing charges;
• listing fees;
• data fees; or
• access charges.

B. Reduced price competition

A concentrated market may reduce the ability of buyers and sellers to negotiate competitive prices.

C. Market foreclosure

A dominant platform may restrict access to competing:

• brokers;
• project developers;
• registries;
• verification bodies; or
• trading venues.

D. Information advantages

A platform controlling substantial transaction data could potentially obtain commercially sensitive information concerning:

• prices;
• volumes;
• customer identity;
• future demand;
• project pipelines.

This information can create competitive advantages over rivals.

E. Self-preferencing

A vertically integrated platform might favor credits that it owns, finances, certifies, or sells.

F. Buyer power

Large corporate purchasers could potentially exercise monopsony or oligopsony power against smaller project developers.

G. Quality foreclosure

A dominant undertaking might influence which methodologies or standards become commercially accepted.

7. Merger Control

A carbon-market merger may involve:

Horizontal merger

Two carbon-credit exchanges merge.

Vertical merger

A carbon-credit exchange acquires a verification or registry business.

Conglomerate merger

An energy company acquires a carbon-credit marketplace while also purchasing large quantities of credits.

Ecosystem merger

A major technology or financial company acquires several interconnected carbon-market businesses.

Competition authorities may examine:

• market shares;
• concentration indices;
• entry barriers;
• network effects;
• switching costs;
• access to carbon-market data;
• customer foreclosure;
• input foreclosure;
• interoperability;
• efficiencies;
• failing-firm arguments; and
• potential competition.

8. Six Important Case Laws / Decisions

1. Barclays plc / Tricorona AB — Irish Competition Authority, M/10/019 (2010)

This is one of the most directly relevant carbon-credit merger decisions.

Barclays proposed acquiring Tricorona, with both businesses active in carbon-credit trading. The Irish Competition Authority examined the transaction specifically in relation to carbon-credit trading.

The Authority noted that carbon credits could be sourced from numerous international developers, brokers, traders, exchanges, financial institutions and companies participating in emissions-trading schemes.

Barclays had an estimated 15–20% share of the global carbon-credit market, while Tricorona had less than 0–5%, producing a negligible increment. The Authority therefore concluded that the transaction would not substantially lessen competition in Ireland.

Competition-law significance

The case demonstrates:

• direct merger analysis of carbon-credit trading;
• importance of market shares;
• importance of the increment produced by a transaction;
• significance of alternative sources of carbon credits; and
• the importance of international competition.

Principle

A carbon-market acquisition does not necessarily create competition concerns merely because both parties trade carbon credits. The authority must examine actual market structure and competitive constraints.

2. EEX / Nasdaq Power — European Commission, M.11241

This transaction is particularly important for modern carbon-market infrastructure.

Nasdaq Power's business included activities facilitating trading and clearing of Nordic, French and German power derivatives and EU Emission Allowance derivatives.

The European Commission considered whether the proposed concentration fell within the EU Merger Regulation and invited third-party observations.

Competition significance

The case illustrates that carbon-market competition is not limited to ownership of carbon credits.

It can also involve:

• exchanges;
• derivatives;
• clearing;
• trading infrastructure;
• financial-market access.

Principle

Competition authorities may examine market infrastructure surrounding carbon allowances, especially where consolidation affects trading or clearing services.

3. Sev.en Energy / Huaneng-Yudean / InterGen — European Commission, M.9305

This transaction involved energy companies whose activities included trading CO₂ emission allowances.

The Commission's notification expressly identified:

• CO₂ emissions trading;
• electricity generation;
• wholesale electricity supply; and
• related energy activities. 

Competition significance

This case demonstrates the importance of considering carbon trading within a wider energy ecosystem.

A company can simultaneously be:

electricity generator + carbon-market participant + carbon trader.

That raises potential vertical and conglomerate concerns.

Principle

Carbon-market concentration should not necessarily be examined in isolation where the parties have substantial positions in related energy markets.

4. KGHM / Tauron Wytwarzanie / JV — European Commission, COMP/M.5979

The Commission examined a transaction involving electricity-generation activities and expressly considered the market for CO₂ allowances/emission-right trading.

The Commission's analysis treated CO₂ allowances/emission rights trading as a separate market and considered whether EUAs and CERs should be included within the same product market. It considered the geographic market to be EU-wide.

Competition significance

This is particularly useful for market-definition analysis.

It illustrates that:

• CO₂ allowance trading may constitute a distinct relevant market;
• different carbon instruments may not automatically be treated as identical;
• geographic scope can be wider than national borders.

Principle

The relevant market should be constructed according to economic substitutability, rather than simply treating every environmental credit as the same product.

5. DK Recycling und Roheisen GmbH v European Commission, C-540/14 P

Although this was not a conventional antitrust merger case, it is highly relevant to competition conditions in emissions markets.

The dispute concerned the EU ETS system and the allocation of free emission allowances.

The Court of Justice emphasized that preservation of conditions of competition in the internal market is an important sub-objective of the EU emissions-trading system. It also stressed the importance of harmonised sectoral allocation rules because inconsistent allocation could distort competition.

Competition significance

This establishes an important conceptual connection:

Carbon-market regulation itself must avoid creating unjustified competitive distortions.

Principle

Competition law is not concerned only with private-company mergers and cartels. The design and implementation of carbon-allocation mechanisms can also influence competitive conditions.

6. Romonta GmbH v European Commission, T-614/13

Romonta challenged the refusal of additional free emission allowances under the EU ETS.

The General Court recognised the competition implications of differing allowance allocations. It noted that granting additional allowances to some installations could distort or threaten to distort competition because undertakings covered by the ETS operate in an integrated market.

Competition significance

The case illustrates the relationship between:

• carbon allowance allocation;
• competitive neutrality;
• cross-border trade; and
• competitive distortions.

Principle

Differences in the allocation or treatment of carbon-market instruments can have consequences extending beyond the individual undertaking receiving them.

9. Additional Relevant Precedent

7. Commission v Estonia, C-505/09 P

The dispute concerned Estonia's national allocation plan for emission allowances.

The Court recognised that the EU ETS has multiple objectives, including preserving the integrity of the internal market and conditions of competition.

Relevance

This is useful where a carbon-credit or allowance market becomes affected by government allocation decisions.

It supports the proposition that carbon markets must operate consistently with competitive neutrality.

10. Concentration and Abuse of Dominance

Market concentration by itself is not unlawful.

Competition law generally distinguishes:

Having market power
from
abusing market power.

Therefore, a carbon-credit exchange with a very high market share is not automatically violating competition law.

Problems may arise where the dominant undertaking engages in conduct such as:

• discriminatory access;
• exclusionary rebates;
• tying;
• refusal to deal;
• self-preferencing;
• predatory pricing;
• exclusive dealing;
• discriminatory data access;
• interoperability restrictions; or
• discriminatory certification.

11. Essential-Facility Issues

Some carbon-market infrastructures could potentially become economically indispensable.

Examples include:

• a dominant carbon-credit registry;
• an indispensable certification system;
• a major trading platform;
• an unavoidable clearing infrastructure;
• unique carbon-market data.

If an infrastructure is genuinely indispensable and competitors cannot reasonably duplicate it, refusal of access may potentially raise essential-facility concerns.

However, the legal threshold for compulsory access is generally high.

The undertaking seeking access would ordinarily need to demonstrate factors such as:

1. indispensability;
2. absence of realistic alternatives;
3. inability to compete without access;
4. unjustified refusal; and
5. potential elimination of effective competition.

12. Data Concentration

Carbon markets increasingly depend on data concerning:

• project quality;
• carbon accounting;
• satellite monitoring;
• verification;
• historical prices;
• transaction volumes;
• retirement records;
• project performance;
• permanence;
• additionality.

If one company controls a uniquely valuable carbon-market dataset, it may acquire an important competitive advantage.

This creates possible competition issues involving:

Data foreclosure

Competitors cannot access essential information.

Data discrimination

The dominant firm gives better information to its own trading arm.

Data aggregation

Combining carbon-market data with energy, financial or corporate procurement information can strengthen market power.

13. Network Effects

Carbon trading platforms may display strong network effects.

More buyers attract more sellers.

More sellers attract more buyers.

More transactions create better price discovery.

Better liquidity attracts additional participants.

This can produce a cycle:

More users → more liquidity → better prices → more users → greater market power.

Consequently, an initially competitive carbon exchange can potentially evolve into a concentrated platform market.

14. Vertical Integration

A particularly important competition concern is:

Carbon-credit project developer + verifier + registry + exchange + broker + buyer

being controlled by one corporate group.

Potential risks include:

• preferential listing;
• discriminatory verification;
• preferential access to registry services;
• self-preferencing;
• access foreclosure;
• confidential-information advantages;
• discriminatory transaction fees.

Vertical integration is not automatically harmful, however. It can also create efficiencies through:

• lower transaction costs;
• improved verification;
• reduced fraud;
• better monitoring;
• faster settlement;
• improved market liquidity.

Therefore, authorities must examine the actual competitive effects.

15. Buyer-Side Concentration

Competition analysis should also examine buyers.

Suppose five multinational corporations purchase most credits generated by a particular category of carbon-removal projects.

They could potentially obtain bargaining power over project developers.

Possible effects include:

• lower prices paid to developers;
• unfavorable contractual terms;
• exclusivity requirements;
• control over future project supply;
• acquisition of project pipelines.

This resembles monopsony or oligopsony power.

The relevant question is not simply:

"How many buyers exist?"

but:

"Can sellers realistically switch to alternative buyers?"

16. Quality and Integrity as a Competition Parameter

Carbon-credit markets differ from conventional commodity markets because quality itself is a competitive variable.

Buyers may compete for:

• high-permanence removals;
• independently verified projects;
• high additionality;
• biodiversity benefits;
• jurisdictional credits;
• credits meeting particular international standards.

A dominant market participant could potentially influence the definition of what constitutes "high-quality" carbon.

This creates a competition issue if control over quality standards is used strategically to exclude rival suppliers.

17. Greenwashing and Competition

Competition law may also intersect with environmental claims.

A company may market carbon credits as:

• "high integrity";
• "net-zero compatible";
• "permanent";
• "additional"; or
• "carbon neutral."

If misleading claims are used to obtain competitive advantage, the issue may extend beyond traditional antitrust law into:

• consumer protection;
• unfair commercial practices;
• securities regulation; and
• environmental claims regulation.

Thus, carbon-market competition regulation may require coordination between competition and consumer-protection authorities.

18. Indian Perspective

India is developing a regulated carbon-market framework through the Carbon Credit Trading Scheme (CCTS).

The developing Indian framework is particularly important because the market infrastructure itself can influence competition.

Recent analysis of India's framework identifies the Indian Carbon Market and the role of power exchanges in carbon-credit trading, with CERC's 2026 regulations addressing purchase and sale of Carbon Credit Certificates and providing for compliance and offset market segments.

Competition issues may therefore arise concerning:

Exchanges

If trading becomes concentrated among a few exchanges, access and fee structures could become important.

Registry

Control over the registry could create an infrastructural bottleneck.

Verification

Concentration among accredited verification bodies could affect project entry.

Price discovery

Exchange rules and algorithms can affect transparency and liquidity.

Access discrimination

A platform could potentially disadvantage competing brokers or market participants.

Information concentration

A major exchange or intermediary could possess commercially sensitive trading information.

19. Application of the Competition Act, 2002

In India, the principal provisions potentially relevant to carbon-credit market concentration are:

Section 3

Restricts agreements having or likely to have an appreciable adverse effect on competition.

Potential examples:

• price-fixing among carbon-credit traders;
• allocation of carbon projects;
• bid-rigging;
• market-sharing agreements;
• collective exclusion of a competing exchange.

Section 4

Deals with abuse of dominant position.

Potential concerns include:

• discriminatory access;
• unfair pricing;
• denial of market access;
• tying;
• exclusionary conduct;
• discriminatory conditions.

Sections 5 and 6

Potentially relevant to combinations involving:

• carbon exchanges;
• carbon-market technology companies;
• registries;
• verification firms;
• major project developers;
• financial intermediaries.

20. HHI and Concentration Analysis

Authorities may use conventional concentration tools such as the Herfindahl-Hirschman Index (HHI).

For example, assume a hypothetical carbon-credit exchange market:

HHI:

45² + 30² + 15² + 10² = 3,250

That indicates a highly concentrated hypothetical market.

If A acquired C:

• combined share = 60%;
• the HHI would increase substantially;
• the authority would examine whether the transaction removes an important competitive constraint.

But market share and HHI should not be treated as automatic conclusions. Carbon markets may have unusual characteristics such as differentiated products, global supply, liquidity differences and rapidly changing regulatory eligibility.

21. Barriers to Entry

Carbon-market concentration becomes more significant where entry barriers are high.

Important barriers may include:

• regulatory approval;
• accreditation;
• capital requirements;
• access to registries;
• technological infrastructure;
• liquidity requirements;
• reputation;
• access to corporate customers;
• verification capacity;
• network effects;
• access to high-quality carbon projects.

If entry is easy, a high market share may be less concerning.

If entry is difficult, the same market share may confer considerably greater market power.

22. Potential Theories of Harm in a Carbon-Market Merger

A competition authority could investigate:

Horizontal unilateral effects

The merged entity could raise transaction fees or reduce service quality.

Coordinated effects

Fewer exchanges may make coordination easier.

Vertical foreclosure

A dominant registry could restrict competing exchanges.

Input foreclosure

A major project developer could refuse credits to competing marketplaces.

Customer foreclosure

A dominant exchange could lock in large corporate buyers.

Data foreclosure

The merged company could restrict access to critical market data.

Innovation harm

A merger could eliminate a nascent competitor developing superior carbon-accounting technology.

23. Possible Remedies

Competition authorities may impose:

Structural remedies

• divestiture;
• sale of a trading platform;
• separation of registry operations.

Behavioral remedies

• non-discriminatory access;
• transparent fees;
• interoperability;
• data-access commitments;
• firewalls;
• prohibition of self-preferencing;
• equal treatment of competing brokers.

Governance remedies

• independent oversight;
• conflict-of-interest rules;
• independent compliance systems.

The EU carbon-market framework itself emphasises transparent, non-discriminatory and orderly access to auctions and trading infrastructure.

24. Key Legal Principles From the Cases

25. Important Distinction: Carbon Credits vs Carbon Allowances

This distinction is essential in an examination answer.

Carbon allowances

Usually created under a mandatory emissions-trading scheme.

Example:

EU Allowances under the EU ETS.

Carbon credits

Generally represent verified emission reductions or removals generated by particular projects.

Examples may include:

• reforestation;
• methane capture;
• renewable-energy projects;
• carbon removal;
• industrial efficiency projects.

The competition analysis therefore depends heavily on the regulatory function and substitutability of the particular instrument.

26. Conclusion

Competition law has an increasingly important role in carbon-credit trading markets because concentration can occur not merely through ownership of credits but through control of the infrastructure that makes carbon trading possible.

The principal competition questions are:

1. What is the relevant carbon-credit market?
2. What is its geographic scope?
3. How concentrated is the market?
4. Are credits sufficiently substitutable?
5. Are there significant entry barriers?
6. Who controls trading infrastructure?
7. Who controls verification and certification?
8. Does one firm control critical data?
9. Does vertical integration permit foreclosure?
10. Does a merger eliminate an important competitive constraint?
11. Can buyers exercise monopsony power?
12. Are access conditions discriminatory?

The existing authorities demonstrate that carbon markets can be examined through ordinary competition-law concepts such as market definition, concentration, merger control, dominance, foreclosure and competitive neutrality. The particularly significant direct precedent is Barclays/Tricorona, while EU emissions-trading decisions such as KGHM/Tauron, Sev.en Energy/InterGen, DK Recycling, and Romonta demonstrate how competition considerations interact with carbon-market regulation. The EU framework also treats orderly, transparent and non-discriminatory market access as an important safeguard for carbon-market integrity.

Exam takeaway: Carbon-credit market concentration is not unlawful merely because the market is concentrated. The central competition-law inquiry is whether concentration gives an undertaking the ability and incentive to restrict access, exclude rivals, exploit buyers or sellers, manipulate market infrastructure, or otherwise substantially weaken effective competition.