hydro works in the exact same way, just with water instead of steam, solar works using PV technology, so it's fairly novel.

And wind is basically the same thing, just using the air, instead of steam.

It's all mechanically the same at the end of the day, excluding solar. The primary difference is that we don't burn fuel for heat to make steam, we use potential, or kinetic energy from our environment instead.

Also to be clear, if we're being pedantic and nitpicky, when i say most i mean percent of production. The vast majority of production globally is through coal, oil, and natural gas. All using thermal processes. And some nuclear, though not as much as solar/wind though.