The UK government can’t adequately show that biomass generators comply with sustainability requirements, according to the National Audit Office (NAO). The “lack of evaluation” of the effectiveness of generators — such as Drax Group — to burn wood pellets at power stations needs to be addressed, the agency said in a report. Ministers are consulting on extending biomass subsidies beyond 2027, and the report recommends an impact assessment should be published before a decision is made. “If biomass is going to play a key role in the transition to net zero, the government needs to be confident that the industry is meeting high sustainability standards,” Gareth Davies, head of the NAO said. The report “serves as a reminder of the scale of financial support required by the sector, especially Drax”said Jenny Ping, at Citigroup. She added that any government decisions around this could be delayed especially due to the upcoming election.