Swansea Bay's tidal lagoon - in 60 seconds

The building of a £1bn tidal lagoon in Swansea Bay has been given the go-ahead by the UK Government.

Tidal Lagoon Power (TLP) says it will now negotiate how much subsidy will be paid for the energy.

That is still a big hurdle for the developers, who want five other lagoons on the west UK coast to harness power, to make the project financially viable.

There are also concerns about the impact on the environment and migratory fish.

BBC Wales environment correspondent Iolo ap Dafydd explains the nuts and bolts in 60 seconds.

Computer generated material from Tidal Lagoon Power