The future should be a combination of wind, tidal, and solar, battery/hydrogen storage and generation IV nuclear. It's worth reading up about the Gen IV International Forum, they are working on some pivotal technology for future nuclear generation.
There's 50MW of battery storage been built on a coal/gas power station near me, a further 50MW is planned at another derelict coal fired station site nearby, as well as a significant solar farm and a renewable energy hub. Then there's another 50MW planned on the site of the power station next door, after it is flattened over the next 5 years... and 1600 houses too, but that's another story.