without driving up construction costs...
We probably can't
But really there are no other options.
You need to do something radical, like for eg. abandoning the market (Gasps from onlookers, ladies fainting and all) It really hasn't worked for energy, and we have given it 25 years or so and a few restarts when it turned out that 'trading types' turned out, by and large to be sociopathic crooks (who'd have thought).
To build a nuke you need to be able to flog the resulting nimble amps for an agreed price _for the productive life of the station_ thats why edf needed to be given extra time in the comfy chair and blowjobs all round to build hinkley, and walked away from sizewell. with a bogus market in place, such price guarantees are meaningless.
The real killer for us in the UK is the way the regulator is letting the renewable gravy train runaway at full speed!
Just you wait until you see what they have planned next... actually you probably wont see it, as the lights going out is going to be a far more frequent occurrence than even your average Nigerian is used to.
We are chucking billions at this non solution, basically softening the fall for all the developers that suffered a hard landing when their plans to cover every flood plain in the land with houses met the economic meltdown caused (in no small measure) by flogging dodgy mortgages to idiots seeking to buy jerry built houses on flood plains.
The one upside is that I'll almost certainly be gone by the time the shit really hit's the fan, so file under 'someone else's problem' :-)