. >> rising fuel bills have raised questions about how much of that is due to paying for renault will energy and other attempts to cut carbon emissions. some argue that technologies like wind turbines are too expensive and warned extra cost could see the bills going up by hundreds of pounds. the committee on climate change that advises the government says its analysis shows it is not the case. for dole few household, homes that use gas for heating have found bills of all have gone up by 455 pounds between 2004 and 2010, and of that, too lantern and 90 pounds were down to the rise in wholesale gas prices and 75 pounds, 16%, was due to low power, generation and energy efficiency improvement in homes. looking ahead, it says it's best estimate is low carbon policies will add a further 110 pounds to dual fuel bills by 2020, significantly more for those using only a lecture city. some analysts say there are too many assumptions and to many variables to reach such a conclusion -- how much will be built, what costs, what gas prices will be, and consumer groups say even at the levels predicted