Another attempt at Swansea Bay Tidal Lagoon

[dan_b]

Those south facing roofs you're talking about are the easy and cheap to do deployment to 90% renewables. After that it gets increasingly difficult and expensive to build out infrastructure that will give us the 100% 24/7/365 renewables/zero carbon grid that we need - ie when we no longer use gas as a plant of last resort and have several weeks of dispatchable storage.