The 5% -> 25% was literally the easiest part. The big expensive downsides to renewables really aren't a factor. Intermittency is minor when you can fall back on

The 5% -> 25% was literally the easiest part. The big expensive downsides to renewables really aren't a factor. Intermittency is minor when you can fall back on 75%, if there's only 50% to fall back on that's a problem.