Case C-767/19: Judgment of the Court (Tenth Chamber) of 3 December 2020 — European Commission v Kingdom of Belgium (Failure of a Member State to fulfil obligations — Directives 2009/72/EC and 2009/73/EC — Internal market in electricity and natural gas — Effective separation between the operation of electricity and gas transmission networks on the one hand, and supply and production activities on the other — Establishment of independent national regulatory authorities)