The Department for Energy and Climate Change says it has "needed to drive through reforms to secure investment in new generation to keep the lights on in the years and decades ahead" after suggestions it may have cost consumers by awarding eight renewables contracts too early.
A spokesperson said the National Audit Office's report recognises that the early deals were "designed to offer better value to bill-payers" by reassuring investors.
"Without that investment, projects would have been unable to go ahead or been significantly delayed - putting our future energy security at risk."
More top news
Food imports to the war-ravaged country are at an all time low and its people are at risk of catastrophic hunger, according to the charity.
A "life-size" baby Jesus has been found by police after the doll was stolen from its crib in a church nativity scene.
A man who has been on the run from the FBI for 10 years has been jailed for sexually assaulting a teenage girl in a Lancashire park.