To appreciate what's going on there, you need to understand the capacity factor. That's the percentage of a power plant's maximum potential that's actually achieved over time.
Consider a solar project. The sun doesn't shine at night and, even during the day, varies in brightness with the weather and the seasons. So a project that can crank out 100 megawatt hours of electricity during the sunniest part of the day might produce just 20 percent of that when averaged out over a year. That gives it a 20 percent capacity factor.
One of the major strengths of fossil fuel power plants is that they can command very high and predictable capacity factors. The average U.S. natural gas plant, for example, might produce about 70 percent of its potential (falling short of 100 percent because of seasonal demand and maintenance). But that's what's changing, and it's a big deal.
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