Cap-and-trade programme
An Emission Trading System (ETS) – also known as cap and trade – is a tradable-permit system for GHG emissions. It sets a limit (the cap) on the GHG emissions that can be emitted. Entities covered by the ETS need to hold one emission unit (allowance) for each tonne of GHG emitted, but entities have the flexibility of selling and buying emission units. The total number of emission units reflects the size of the cap in the ETS. Under this approach, the price on carbon will depend on the balance between demand (the total emissions) and the supply (the emission units allocated and available). Once a cap is set, the government distributes the tradable permits among companies. These permits could be distributed for free (based on past emissions or performance standards) or be auctioned. The government decides the sectors of the economy and the GHGs that would be included in the system. Power and industrial sectors are the most commonly seen in the systems operating around the world. Carbon dioxide (CO2 ), as the most common GHG, is also usually covered by an ETS. Other GHGs include methane (CH4 ), nitrous oxide (N2O) and synthetic gases (SF6 , HFCs and PFCs).

Application Examples
Example title Country Related technology measure Source
Contract for Difference (2014-2020)
United Kingdom of Great Britain and Northern Ireland
EU Emissions Trading System (EU ETS)
Sweden