A UK government spending watchdog has questioned the value of the multibillion pound subsidies granted to the Drax power plant in North Yorkshire – and said plans to hand over billions more may not represent value for money. The government has provided about £22bn of public money to businesses and households that burn biomass pellets as fuel over the past three years, including £6.5bn for the owner of the Drax plant. The power plant, which generates about 5% of the UK’s electricity, is expected receive more than £10bn in renewable energy subsidies between 2015 and the end of 2026 – despite ongoing concerns that wood pellets are not always sustainably sourced. The Public Accounts Committee has said that biomass generators have been left to “mark their own homework” when it comes to proving that their fuel met the sustainability standards set by the subsidy scheme.