The world’s first power-generating Tidal Lagoon is to be built in Swansea Bay, UK, to harness the bay’s powerful Atlantic Ocean tides. The lagoon will cover over 11 square kilometers of sea off the coastline of South Wales. As the tide flows into and out of the lagoon, it will power turbines generating enough power for a whole city — over 155,000 homes. That’s equivalent to 90% of Swansea Bay’s annual domestic electricity use. And that’s just one power station. This will be the first project of its kind in the world. (