The Swansea tidal lagoon had an average guaranteed price per megawatt hour of £150 – more than double that of future offshore windfarms

Guaranteed price of power per megawatt hour, £

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Swansea tidal lagoon Guaranteed price, without Welsh government equity stake. Could be operational 2021 £150 Contract for 30 years

Offshore windfarms built 2017-19 Average guaranteed price awarded in 2015 117.07 Contract for 15 years

Hinkley Point C nuclear power station Average guaranteed price awarded in 2016, expected to be operational 2025-26 92.5 Contract for 35 years

Wylfa nuclear power station Expected guaranteed price, with UK government equity stake. Due to be operational in mid-2020s 77.50 Contract for 35 years

Offshore windfarms built 2021-2023 Average guaranteed price awarded in 2017 62.14 Contract for 15 years