This book examines the issue of capacity withdrawals in the electricity wholesale market. Electricity generators can exercise market power in the wholesale market either by withdrawing generation capacity, or by pricing above competitive levels in order to achieve a higher market price and, thereby, increase revenues. After a comprehensive explanation of capacity withdrawal practices and the issues that arise when proceeding under competition law, the book analyses whether an increased state of transparency, as provided for in the REMIT and Regulation 543/2013, could facilitate the efficient functioning of electricity wholesale markets and the investigation of capacity withdrawal practices. It also examines the effect of the prohibition of market manipulation as prescribed in the REMIT in dealing with abusive capacity withdrawals in the electricity wholesale market.