Energy company RWE npower's new gas-fired Pembroke Power Station, the largest of its type in Europe, is seen during its completion ceremony in Pembroke, Wales September 19, 2012. The 2000MW station, which cost 1 billion pounds Sterling ($1.62 billion US dollars) will generate enough electricity to power 3.5 million homes. REUTERS/Rebecca Naden (BRITAINENERGY - Tags: ENERGY BUSINESS)