One of the largest unions in Wales, Unite, has thrown its weight behind proposals to bring a tidal lagoon to Swansea Bay.
The £800m project could provide electricity for thousands of homes in Wales.
It's expected to be completed by 2018.
The union understands the project will create over 1900 full time jobs during the construction phase, with further jobs becoming available post construction.
You can see more on this story on Coast and Country tonight on ITV Cymru Wales at 8pm.
Plans for a massive tidal lagoon in Swansea Bay, able to generate electricity for over 120,000 homes, have been submitted to planners.
Developers behind the lagoon say if the project is successful, up to five other lagoons could be built along the Welsh coastline within the next decade.
Friends of the Earth Cymru have issued a cautious welcome to the Swansea Bay Tidal Lagoon project, which is submitting its planning application today.
The submission of a planning application today for a tidal lagoon in Swansea Bay marks a "major step" towards realising one of the UK's "most game-changing infrastructure projects", according to the CEO of Tidal Lagoon Power, Mark Shorrock.
The project would see a 9.5 km long sea wall built to capture enough renewable energy from incoming and outgoing tides to power over 120,000 homes for 120 years
The planning application for a tidal lagoon in Swansea Bay will be submitted today, which has been developed through "extensive consultation" over the last three years.
It will now be reviewed by the Planning Inspectorate before public examination and then determined by the Secretary of State for Energy and Climate Change. Natural Resources Wales will consider an application for the marine license that is required.
The project would see a 9.5 km long sea wall built to capture enough renewable energy from incoming and outgoing tides to power over 120,000 homes for 120 years.
Tidal Lagoon Power Limited has spent millions of pounds over the last three years developing its proof-of-concept project, alongside a consortium of internationally-renowned industrial businesses.
A new report says the development of a tidal lagoon in Swansea Bay could create nearly 2,000 jobs and bring £300m to the local economy.
But, concerns have been raised about the plans, with some locals questioning the environmental and visual impact the structure will have on the bay.
Tidal Lagoon Swansea Bay Ltd, the company behind the development, say the earliest work could start on the construction is 2015, should the UK Government give it the green light.
The firm behind plans for a massive tidal power station for Swansea Bay have revealed details of their proposals today.
The scheme would trap the tide in a vast lagoon and release it through turbines to generate electricity.
If it's given the go-ahead, the project would cost £750m and provide more than enough power for a city the size of Swansea.
The Chief Executive of Tidal Lagoon Swansea Bay has told ITV News that Wales could become a world leader in tidal energy.
It's an area that can boast the world's first global industrial city, the first passenger railway in the world and the UK's first area of outstanding natural beauty. Today Swansea Bay submitted its final bid to become the UK's city of culture in 2017. Megan Boot has the story.
A coach full of choristers, ice cream makers and football fans made their way from Mumbles to the Houses of Parliament yesterday, to show minsters what Swansea has got going for it.
Swansea Bay is competing against three other places - Dundee, Hull and Leicester - to be named Britain's City of Culture in 2017.
The prestigious title is held by a city every four years.