This completely revised and reworked second edition: incorporates the conclusions and consequences of the Sectoral Energy Competition Enquiry u contains an entirely reworked section on anti-competitive agreements and practices u examines in detail the developments in individual cases concerning long-term capacity reservation and sales/purchase agreements u considers recent developments on cases concerning collusion on price and quantity restrictions u looks into detail at the consequences of the Sectoral enquiry on abuse of a dominant position, particularly regarding discrimination in network access u revises the section on merger control to take account of developments in the methodology in defining markets and defining dominance/significant impediment of competition from the Sectoral enquiry u includes major new merger cases u updates the State Aid section to take account of new decisions on renewable support schemes and security of supply.