Case C-480/09 P: Judgment of the Court (Second Chamber) of 16 December 2010 — AceaElectrabel Produzione SpA v European Commission, Electrabel SA (Appeal — State aid — Aid declared compatible with the common market — Condition requiring prior repayment by the beneficiary of earlier aid declared unlawful — Concept of ‘economic unit’ — Joint control by two separate parent companies — Distortion of the pleas in law relied on in the application — Errors and defective reasoning)