Case C-349/17: Judgment of the Court (Grand Chamber) of 5 March 2019 (request for a preliminary ruling from the Tallinna Ringkonnakohus — Estonia) — Eesti Pagar AS v Ettevõtluse Arendamise Sihtasutus, Majandus- ja Kommunikatsiooniministeerium (Reference for a preliminary ruling — State aid — Regulation (EC) No 800/2008 (General block exemption regulation) — Article 8(2) — Aid with an incentive effect — Concept of ‘start of work on the project’ — Powers of the national authorities — Unlawful aid — No decision of the European Commission or of a national court — Obligation on the national authorities to recover unlawful aid on their own initiative — Legal basis — Article 108(3) TFEU — General principle of EU law of protection of legitimate expectations — Decision of the competent national authority granting aid under Regulation No 800/2008 — Knowledge of circumstances excluding the eligibility of the aid application — Creation of a legitimate expectation — None — Limitation — Aid co-financed from a structural fund — Applicable legislation — Regulation (EC, Euratom) No 2988/95 — National legislation — Interest — Obligation to claim interest — Legal basis — Article 108(3) TFEU — Applicable legislation — National rules — Principle of effectiveness)