Joined Cases C-798/18 and C-799/18: Judgment of the Court (Fifth Chamber) of 15 April 2021 (requests for a preliminary ruling from the Tribunale amministrativo regionale per il Lazio — Italy) — Federazione nazionale delle imprese elettrotecniche ed elettroniche (Anie) and Others (C-798/18), Athesia Energy Srl and Others (C-799/18) v Ministero dello Sviluppo economico and Gestore dei servizi energetici (GSE) SpA (References for a preliminary ruling — Environment — Articles 16 and 17 of the Charter of Fundamental Rights of the European Union — Principles of legal certainty and of the protection of legitimate expectations — Energy Charter Treaty — Article 10 — Applicability — Directive 2009/28/EC — Article 3(3)(a) — Promotion of the use of energy from renewable sources — Production of electricity from solar photovoltaic installations — Alteration of a support scheme)