A truce over wind farms...but how long will it last? Last night, Conservative sources claimed they have won the battle to keep green costs as low as possible, while making sure the lights stay on. They were saying that Liberal Democrats wanted the total costs on household and industry bills to be as high as £10 billion by 2020 - rather than £7.6 billion as agreed. However, the fact remains that Ed Davey, the Energy Secretary, was successful in pushing through his reforms of the electricity market despite many backbench Conservatives arguing that renewables are an expensive low-carbon source of energy. Official estimates suggest that bills will go up by an estimated £170 a year by 2030 under all the Government's green and fuel poverty policies, with the contribution to nuclear and renewables making up £95 by 2020. Liberal Democrat sources last night said the party is "extremely pleased" to have won support for the "really positive" reforms that will mean more wind farms and nuclear power stations are built. Securing a concrete deal will come as a boost to Mr Davey, after he clashed with Mr Hayes, the new Conservative energy minister, who promised to bring an end to the rash of wind farms "peppered" all over the countryside. It is also expected to be a big boon for jobs, with billions of pounds of investment needed to make sure closing coal stations are replaced with low-carbon sources. Mr Davey did, however, compromise in other areas. The Chancellor managed to secure key concessions that mean Britain will have the option of continuing to build more traditional gas power stations into the next decade. Mr Osborne threw out Liberal Democrat demands for the "decarbonisation" target that would have forced Britain to get all its power from green sources by 2030. In the final agreement, this will be decided in 2016 - after the next general election. Green groups are furious that this "decarbonisation" target has been scrapped, with Andy Atkins, executive director of Friends of the Earth, saying Mr Osborne's move "banged the final nail in the coffin of Cameron's pledge to lead the greenest Government ever. The lack of such a target also goes against the advice of the Committee on Climate Change, independent Government advisers, who warned that this will be necessary to help meet Britain's international obligations on reducing emissions. Mr Osborne also got an agreement that the UK will reconsider its "carbon budget" - another target on reducing carbon dioxide emissions - if it causes the causing the UK economy to lag behind other countries. In another win for the Chancellor, he will promote a "gas strategy" that will make clear Britain is committed to maximising its fossil fuel resources. When this document is published alongside Mr Osborne's autumn statement early next month, it could re-ignite the row with environmentalists again. And backbench Tories are still agitating for the brakes to be put on onshore wind generation, buoyed by Mr Hayes's promise that "enough is enough." So although the Conservatives and Liberal Democrats have found a truce for now, it remains to be seen how long that will last.