16 Blades,
I agree with you we need to start building fusion reactors again (although based on the British designs not the U.S. ones - according to friends who work in the industry the AGRs are a lot safer than PWRs). However
So-called 'renewable' sources simply don't have the clout
The schemes currently being implemented don't but the scheme put forward for a tidal barrage power-generation scheme for the Severn estuary was estimated as being capable of priding 20% of the UK electricity requirements - that is quite a lot of 'clout'. And renews itself four times a day (twice in, twice out).