Opinion of Advocate General Wahl delivered on 17 January 2019.#Achema AB and Others v Valstybinė kainų ir energetikos kontrolės komisija (VKEKK).#Request for a preliminary ruling from the Lietuvos vyriausiasis administracinis teismas.#Reference for a preliminary ruling — State aid — Concept of ‘aid granted by a Member State or through State resources’ — Measures intended to compensate providers of public interest services in the electricity sector — Concept of aid ‘affecting trade between Member States’ and ‘distorting or threatening to distort competition’ — Concept of ‘selective advantage’ — Service of general economic interest — Offsetting of costs involved in the discharging of public service obligations.#Case C-706/17.