The United Kingdom Emissions Trading Scheme (the “UK ETS”) was established by the Greenhouse Gas Emissions Trading Scheme Order 2020 (the “UK ETS Order”). The UK ETS runs for ten “scheme years” beginning in 2021, divided into two “allocation periods”, the 2021-2025 allocation period and the 2026-2030 allocation period. Operators of certain industrial installations and certain aircraft operators are required to monitor, report on, and surrender “allowances” equivalent to, their greenhouse gas emissions in each scheme year.