A compliance carbon market is created by law. Governments set a limit on how much regulated industries may emit, then let companies trade the right to emit within that limit. It’s the workhorse of global carbon pricing — and it operates very differently from the voluntary market most blog posts talk about.
How cap-and-trade works
The mechanics are elegant. A regulator sets a cap: the total tonnes of CO2 the covered sectors may emit this year. It issues allowances equal to the cap — each permitting one tonne — by auction or free allocation. Companies that cut emissions cheaply can sell spare allowances; companies that can’t must buy. Every year the cap shrinks, allowances get scarcer, and the price of emitting rises. The market finds the cheapest reductions automatically — that’s the whole point.
The major schemes
The EU Emissions Trading System is the oldest and most liquid, covering power, industry, aviation, and shipping across 30 countries. China’s national ETS is the world’s largest by emissions covered. California’s cap-and-trade links with Québec; the UK ETS split from the EU after Brexit; South Korea, New Zealand, and a growing list of others run their own. India’s Carbon Credit Trading Scheme (CCTS) is bringing compliance trading to one of the world’s biggest emitters. Per the World Bank, roughly 80 carbon pricing instruments now cover about 28% of global emissions.
Compliance vs voluntary: the key differences
Obligation. Compliance participation is mandatory for covered companies; voluntary buyers choose to participate. Instrument. Compliance markets trade government-issued allowances (plus limited approved credits); the VCM trades project-based credits from private standards. Price. Compliance prices are typically far higher and more stable — EU allowances trade at multiples of the average voluntary credit. Enforcement. Miss your compliance deadline and you face fines and must still surrender the allowances; break a voluntary pledge and you face, at most, reputational damage.
Can offsets be used in compliance schemes?
Sometimes, within strict limits. California allows a small percentage of compliance obligations to be met with approved offsets. Colombia lets taxpayers offset carbon tax liability. And the EU has proposed allowing high-quality international credits — governed by Article 6 of the Paris Agreement — to count toward a slice of its 2040 target. This blending of compliance demand with voluntary-style supply is one of the biggest structural stories in carbon markets this decade.
Why it matters to everyone else
Even if your business isn’t covered by an ETS, compliance markets set the tone: they anchor expectations of what carbon should cost, and mechanisms like the EU’s carbon border adjustment (CBAM) extend that price to importers worldwide. The direction of travel is unmistakable — more schemes, tighter caps, higher prices.
