I dunno last time I checked that bright thing in the sky sure does pump out a lot of energy.
Not so much at night.
Renewables are variable, tidal would be a good one for the UK to invest in but we aren't for some reason. You still need a consistent source to make up the shortfalls of renewable energy production, at night / winter, when winds drop etc.
Germany seems to be looking at getting coal power plants ready to take over from gas, dirty short term to go greener long term.