Case C-92/19: Judgment of the Court (Seventh Chamber) of 17 September 2020 (request for a preliminary ruling from the Consiglio di Stato — Italy) — Burgo Group SpA v Gestore dei Servizi Energetici SpA — GSE (Reference for a preliminary ruling — Environment — Promotion of cogeneration — Provision of national law establishing a support scheme — Scheme supporting non-high-efficiency cogeneration plants extended beyond 31 December 2010)