Carbon Markets Explained: Compliance Schemes vs. Voluntary Offsets

Carbon markets have emerged as one of the central policy instruments in the global effort to reduce greenhouse gas emissions. By placing a price on carbon, these markets create economic incentives for emission reductions across the economy, directing investment toward the most cost-effective abatement opportunities and generating revenues that can be channelled into climate solutions. However, the landscape of carbon markets is complex, fragmented and rapidly evolving. Two fundamentally different types of market — compliance schemes, in which participation is mandatory for regulated entities, and voluntary markets, in which participants choose to offset their emissions for non-regulatory reasons — operate according to different rules, standards and price signals. Understanding the distinction between them is essential for any professional working in the sustainability, finance or energy sectors.

Compliance Carbon Markets and Emissions Trading

Compliance carbon markets are government-mandated mechanisms in which covered entities — typically large industrial emitters, power generators and, in some schemes, aviation operators — are required to hold sufficient carbon allowances or credits to cover their annual greenhouse gas emissions. The European Union Emissions Trading System, established in 2005, is the largest and most established compliance carbon market in the world, covering around 40 per cent of EU greenhouse gas emissions across power generation, heavy industry and intra-European aviation. Under the EU ETS, a declining cap on total emissions is set by regulators, and allowances are distributed partly through free allocation and partly through auction. Entities that can reduce emissions below their allocated allowance can sell surplus permits; those that exceed their allocation must purchase additional allowances from the market.

Similar compliance schemes operate in California and Quebec under the Western Climate Initiative, in the UK following Brexit separation from the EU ETS, in South Korea, New Zealand and China — where the world’s largest carbon market by volume was established in 2021, covering the power sector. These markets vary significantly in their sector coverage, price levels, cap stringency and design features. EU ETS carbon prices have ranged from below €5 per tonne to over €100 per tonne over the history of the scheme, reflecting the interaction of economic cycles, policy changes and supply-demand dynamics in the allowance market. Carbon price signals in compliance markets directly affect investment decisions in covered sectors, particularly in power generation where the relative economics of coal, gas and renewable generation are directly sensitive to carbon costs.

Building Capability in a Carbon-Constrained Economy

As carbon pricing expands across major economies, organisations are placing greater emphasis on developing internal expertise in emissions strategy, regulatory compliance and carbon cost management. Energy producers, industrial operators and financial institutions increasingly require professionals who understand allowance markets, offset quality, reporting obligations and long-term decarbonisation planning. This has increased demand for carbon management training courses that help teams build the practical knowledge needed to respond effectively to a rapidly evolving policy and commercial landscape.

Businesses that invest early in capability development are often better positioned to identify risks, capture incentives and make more informed investment decisions. Whether navigating emissions trading systems, preparing for border carbon adjustments or evaluating voluntary credit portfolios, professionals with specialist knowledge can create significant strategic value.

Voluntary Carbon Markets: Offsets and Additionality

Voluntary carbon markets operate outside mandatory regulatory frameworks, enabling companies, governments and individuals to purchase carbon credits representing verified emission reductions or removals to offset their own emissions as part of sustainability or net zero commitments. Credits in voluntary markets are generated by a wide range of project types — including avoided deforestation (REDD+), renewable energy, methane capture, improved cookstoves, soil carbon sequestration, blue carbon and direct air capture — and are certified by independent standards bodies including Verra’s Verified Carbon Standard, Gold Standard and the American Carbon Registry, each of which sets its own rules for project eligibility, measurement and verification.

The credibility of voluntary carbon credits depends fundamentally on the concept of additionality — the requirement that the emission reductions attributed to a carbon credit would not have occurred in the absence of the carbon finance provided by the credit sale. Demonstrating additionality is both conceptually and practically challenging, and has been the subject of extensive criticism of the voluntary carbon market, with high-profile investigations finding that some categories of credits — particularly certain REDD+ and renewable energy credits — may not represent genuine, additional emission reductions. The integrity crisis that emerged from these criticisms around 2023 led to significant market disruption, price falls and a broader rethink of standards and governance across the voluntary carbon market.

Market Reform and the Search for Integrity

In response to concerns about credit quality and market integrity, the voluntary carbon market has undergone significant governance reform in recent years. The Integrity Council for the Voluntary Carbon Market published its Core Carbon Principles in 2023 — a set of threshold quality criteria for carbon credits designed to provide a market-wide credibility benchmark. The Voluntary Carbon Markets Integrity Initiative developed guidance on corporate use of carbon credits, emphasising that credits should be used to complement rather than substitute for direct emission reduction efforts. Article 6 of the Paris Agreement, which provides a framework for international carbon market cooperation, is also gradually being operationalised, potentially creating linkages between voluntary and compliance markets and providing higher confidence around credit accounting and double-counting prevention.

The future structure of voluntary carbon markets remains uncertain. High-quality credit categories — particularly high-durability, technology-based removals such as biochar, enhanced weathering and direct air capture — are attracting premium prices and growing corporate commitments, while lower-quality nature-based credits face continued scrutiny. The market is bifurcating between high-integrity, high-cost removal credits and lower-cost but contested avoidance and reduction credits, with corporate buyers increasingly differentiating their portfolios accordingly. Regulatory clarity — on which credits can be used toward corporate net zero claims and how they should be disclosed — will be important in determining the market’s long-term trajectory.

New Markets and 2026 Milestones

The compliance carbon market landscape is expanding rapidly, with several significant milestones occurring in 2026. China, which launched the world’s largest carbon market by volume in 2021 covering the power sector, is actively expanding its scope to include additional industrial sectors and moving toward introducing absolute emissions caps — a significant tightening of its carbon market ambition. Japan’s GX Emissions Trading System launched in 2026, laying the foundations for the country’s industrial decarbonisation and creating the possibility of future linkage with other major compliance carbon markets. In Europe, the Carbon Border Adjustment Mechanism — which imposes a carbon price on imports from countries without equivalent carbon pricing — moved from a reporting-only transitional phase into full operational enforcement in 2026, fundamentally changing the trade economics of carbon-intensive goods entering the EU market.

The CBAM in particular represents a watershed moment for industrial carbon pricing globally. By placing a carbon cost on imports of steel, aluminium, cement, fertilisers, hydrogen and electricity, the EU is effectively extending the reach of its own carbon price beyond its borders and creating powerful incentives for trading partners to strengthen their own domestic carbon pricing regimes. For energy companies and industrial operators selling into EU markets — or competing with EU producers in global markets — understanding the mechanics, coverage and cost implications of CBAM is now an urgent commercial and regulatory priority. The combination of China’s expanding ETS, Japan’s new market and the EU CBAM means that the global coverage of meaningful carbon pricing is expanding meaningfully in 2026, with direct implications for investment decisions across energy-intensive industries.

Skills for Carbon Market Leadership

Carbon markets are becoming more sophisticated, more regulated and more commercially significant each year. Organisations therefore need leaders who can connect sustainability goals with financial performance and operational execution. Enrolling teams in carbon management training courses can strengthen expertise in carbon accounting, emissions reduction strategy, compliance frameworks and market-based climate solutions.

Developing these capabilities not only supports regulatory readiness, but also helps organisations demonstrate credible progress toward net zero commitments while maintaining competitiveness in a lower-carbon global economy.

Conclusion

Carbon markets, both compliance and voluntary, are becoming central features of the commercial landscape for energy companies and businesses across the economy. Understanding how these markets work, what drives carbon prices, how credit quality is assessed and how corporate carbon market engagement is governed is an increasingly valuable professional capability. As these markets mature, reform and expand, the professionals and organisations that have invested in developing deep carbon market expertise will be best positioned to manage risk, capture opportunity and demonstrate credible progress on climate commitments.