The government is under pressure to reconsider its commitment to a new generation of nuclear power stations after the cost of offshore wind power reached a record low. Experts said green energy had reached a tipping point in the UK after two windfarms secured a state-backed price for their output that was nearly half the level awarded last year to Britain's first new nuclear power site in a generation, Hinkley Point C. Vince Cable, the leader of the Liberal Democrats, said the breakthrough should prompt a rethink of the government's energy plans, which have pencilled in atomic plants at Wylffa in Wales, Sizewell in Suffolk and Bradwell in Essex. The spectacular drop in the cost of offshore wind is extremely encouraging and shows the need for a radical reappraisal by government of the UK's energy provision," he said. The government spending watchdog this year described Hinkley as a "risky and expensive" project that generations of British consumers will have to pay for through electricity bills. The auction results are unlikely to halt the Hinkley project. But they pose a serious dilemma for ... new nuclear power plants around the UK and are likely to feed into a flagship government review of energy costs out next month. Most industry watchers had expected future nuclear projects to cost 80-90 per MWh, a long way from the 62.14 average awarded to offshore windfarms. The price of building offshore windfarms has fallen by nearly a third since 2012 as the technology matured.