Commission Decision (EU) 2026/994 of 4 May 2026 granting the Portuguese Republic a derogation from certain provisions of Directive (EU) 2019/944 of the European Parliament and of the Council on common rules for the Internal market for electricity and amending Directive 2012/27/EU in respect of the small isolated system of the island of Berlenga (notified under document C(2026) 2789)