Solar farms did start out as using the sun to boil water. Basically mirrors redirecting light to a central point to super-heat a pipe flowing with water.
Technically, as long as there's more than zero percent humidity I guess wind turbines are still powered by steam. And hydro is essentially steam, too, just the cooler version.
ACKSHUALLY you're not burning atoms in a nuclear reaction. You're creating a chain reaction of neutrons colliding with Uranium isotopes. No combustion.