A new report from the Treasury has revealed the Department of Energy and Climate Change (DECC) failed to spend £400m that had been assigned in the 2011/12 budget.
According to figures from the body, the DECC failed to spend nearly 14 per cent of its allowance, which represents the largest under-spend of any government department, the Guardian reports.
The DECC defended the move after concerns were raised by some green businesses that claimed the government has cut back unnecessarily on climate change spending.
A spokesperson for the body said: "The majority of DECC's under-spend is attributable to additional commercial revenues generated by the Nuclear Decommissioning Authority (NDA)."
Meanwhile, other factors affecting the allowance included an administration reduction and earlier than expected receipts on energy efficiency loans.
The NDA's latest annual report revealed "significant" progress has been made in decommissioning along with considerable savings for the taxpayer being noted.
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