These Regulations are made in exercise of the powers conferred by section 8 of the European Union (Withdrawal) Act 2018 in order to address failures of retained EU law to operate effectively and other deficiencies (in particular under paragraphs 2 (a), (b), (c), (d) and (g) of section 8) arising from the withdrawal of the United Kingdom from the European Union.
Link: The Greenhouse Gas Emissions Trading Scheme (Amendment) (EU Exit) Regulations 2019
Source: Legislation .gov.uk