Use spare electricity to create hydrogen. This can then be used in heating houses and running cars.
The attached BBC weblink goes on about building a desalinasiation plant next to the wind turbines. This is not the best solution. Build one on land and make it bigger. Then it can be shared across any spare energy on the grid. Build it next to the sea to get your water.
Does the water need desalinisation before you can seperate the Hydrogen?