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The government may have pushed up costs for consumers by awarding billions of pounds worth of contracts for renewables without any competition, the spending watchdog has said.
Eight long-term renewable energy deals with a total value of £16.6 billion were awarded early to avoid delays in investment as the government brought in the new "contracts for difference" scheme, which guarantees an agreed price for electricity generated by low-carbon energy.
The contracts were awarded to develop five offshore wind farms, for two coal plants to convert to burning biomass and for one new biomass combined heat and power plant, the National Audit Office said.
The NAO believes the scale of the contracts - awarded without competition between developers - may have increased costs for consumers, who have to meet the price of developing low-carbon power through their energy bills.
If it gets the go-ahead, the tidal lagoon energy project in Swansea Bay could be the first of a series of five developments around the UK coast which could generate as much as 10% of the UK's electricity by 2023.
Tidal Lagoon Power, the company behind the project, said it was hoping that 65% of expenditure would be in the UK, boosting a homegrown supply chain and a possible future export market. The company has produced a video to explain the scheme:
The project includes creating a 10km sea reef, the reintroduction of the native oyster to Swansea Bay, an offshore visitor centre and national triathlon and water sports facilities.
According to the developers, research as part of the project's initial stages found that 86% of local residents were in favour of the scheme. The Swansea Bay project would save 236,000 tonnes of carbon a year and create 1,850 construction jobs.
Plans have been submitted to develop the world's first tidal lagoon energy project in the UK, which would provide renewable power for 120,000 homes for 120 years.
The developers of the £750-850 million project in Swansea Bay say their application is the first step to developing lagoon technology that could meet 10% of the UK's electricity needs from the tides.
The scheme would involve a six-mile (9.5km) wall built around Swansea Bay, creating a lagoon in the Severn Estuary with turbines that can harness the incoming and outgoing tides to generate power 14 hours a day.
The UK Independence Party has called the cut to onshore subsidies a "political stunt" to buy off voters opposed to turbines "despoiling the British countryside".
Energy spokesman Roger Helmer said the change "fails to address the real argument which is the nonsensical and frankly dangerous energy policy this Government is forcing upon UK taxpayers".
He said the taxpayer would still have to fund "this wasteful and downright ridiculous technology to be built out of sight".
An industry body representing the renewable energy sector has said that Government changes to subsidies are good news:
Today is actually a good news day for renewable electricity and renewable heat.
The real reason that support for solar and onshore wind will go down is that they are leading the race for cost-competitiveness with fossil fuels. Government policy is working and bringing down costs.
The important thing is that decisions are evidence-based, not purely political, and we need to see the methodology to assess that.