Green power from Norway will be powering hundreds of thousands of UK homes from 2021, National Grid has said.
Energy will travel via the world’s longest sub-sea electricity interconnector.
The €2bn (£1.4bn) project has been rubber stamped between National Grid and its Norwegian equivalent Statnett.
The UK aims to import enough hydro-power from Norway to provide 14% of yearly household electricity needs.
Alan Foster, director of European business development for National Grid, said: “Access to low-carbon energy from Norway hydro-power stations will help us meet the challenge of greener, affordable energy.
“It also adds to the diversity of energy sources for UK and potentially can reduce peak prices, with benefits for consumers and businesses.”