10 years from now, renewables will make up just 10% of capacity if we even manage to stick to what we've agreed to (and that doesn't mean 10% of what we need - peak energy times are the problem - 10% of our power means NOTHING if it's delivered at the wrong time or only intermittently).
When fossil fuels run out, how do you think you'll be able to MAKE those solar panels, electric cars etc. and transport them? It's a much bigger problem than "Oh, we'll just move onto something else" - literally catastrophic. And that's why pissing about WASTING MORE ENERGY by having incredibly inefficient electric cars (how much coal do you need to burn to make them move a mile, including production and servicing costs?) and all their requirements is actually just making the problem worse - not to mention driving us closer to shortage in plastics and rare-earth materials (Lithium, etc.).
The options? Nuclear. Cheap, simple, well-understood, hugely powerful (makes up the majority of current world production) at the (current) expense of only a single material (which is estimated to last longer than the oil), which can be recycled several times and doesn't pollute the atmosphere, and whose next generation of plants won't even burn that up (fusion is scientifically possible today and has a virtually infinite supply of raw material available to us today too).
But, no, apparently we have to scrap all our nuclear and have things be sloshed about by the waves, gently blown by the wind and slightly heated by the sun instead. You know why? Carbon credits, which we have signed up to, and which we HAVE to now spend money on to make us look go at actual energy-production (and, ironically, the environment's) expense.
Alternative fuels are currently shite. They can't cope with 10% of current demand if you add them all together (which means one fairly-modern bog-standard nuclear plant could actually outpace the entire investment and deployment of all renewable energy in the UK for the last 50 years). They won't cope with any rise required for electric cars and other shite (and, yes, RISE in demand). They also provide more problems than they solve because nuclear plants can be turned on, shut down and powered down. Wind, wave and solar work on their own schedules which are almost opposite to peak demands and have inherently transport/storage costs.
The renewable energy market is currently a subsidised money-grab for private firms and nothing more. We'll meet our carbon targets and STILL not be generating enough electricity by those methods to do anything useful on a national scale (while demand will still rise, possibly exponentially). They aren't providing anything near the existing production methods which we
have been trying to scrap for 100 years.
Sod wind, wave, solar. They just don't provide enough Watts per metre to ever be practical on such a large scale, even with ideal components. Replace them all, and whatever coal/oil plants we have, with a handful of nuclear stations and not have to worry about energy for the next 50 years or so at all.
But apparently, that's not "politically compatible" (i.e. no-one wants to live next to a nuclear plant, whereas fields of huge, creaking, noisy, spinning turbines that can take out your house if their brakes fail are just fine overhead).