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The commission said a tidal lagoon demonstration project – the first in the world – would boost the economy and provide a better understanding of tidal power.

It would show the potential for tidal power and measure the impact on the local environment.

A historic dockyard has been transformed into a "world-class centre" for wind, wave and tidal power projects following a £60m upgrade.

Tidal power is getting closer to commercial viability, given the right price guarantees: wave power is further from market.

The generation mix, depending on where you are, can include natural gas, coal, oil, nuclear, hydroelectric, onshore and offshore wind, tidal power, solar and geothermal heat.