The renewable energy potential of the Severn estuary needs to be used to ensure the UK has enough electricity from energy suppliers in the coming years, according to one expert.
Mick Bates, Welsh Liberal Democrat spokesman on the environment and sustainability, said the tidal power of the estuary could provide energy to help plug a predicted national shortfall occurring within the next eight years.
A series of plans for barrages across the estuary have been under consideration for some time, although environmental campaigners have warned development could have a negative impact on local wildlife.
Mr Bates said: "The government has failed to provide serious investment in renewable energy, cushioned by oil and gas reserves and hoping that nuclear would be the answer to bridge the future energy gap."
A spokesman for the government said nuclear redevelopment is ongoing, while ten gigawatts of new electricity generation is being built at the moment and there are lots of incentives for clean energy projects.
The government recently announced plans to build additional offshore wind farms around the UK coastline to enable more people to switch energy to cleaner sources.
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