What about Wind Mills?

Hydro power uses running water not hot water.

Squeezing can be converter to electricity with pizeo electric. Heat difference can be converted into electric directly with peltier devices. Both of these are very inefficient ways to make electricy.

I guess aeolic energy also doesn't use steam (unless we count the air humidity), but still involves turning a turbine.

Piezoelectricity is the only other I can really think of. But it's not like we are out here smacking crystals with hammers to make power.

All power generation is either solar or 'make thing spin', unless we're including RTGs and Piezoelectrics.

It’s great for nuclear reactors. Hot rock make turbine go brrr

also almost non-corrosive, non-toxic, doesn't damage ozone layer, zero global warming potential, non-flammable etc (lots of organic rankine cycle fluids fail one or more of these. tradeoff is utilization of lower temperature sources)

and diodes

Solar is an exception I think

Geothermal power still uses steam to generate electricity. It's steams all the way down.

Steam just makes sense as a fluid for heat engines, thermal power plants are mostly steam, except when gas turbines are involved, but even then there's most of the time steam bottoming cycle. (gas turbine burns something, then exhaust is hot enough to power steam cycle) Unless thermal power plant is small, then it's more likely to be diesel engine (up to few MW). Only when it's photovoltaics, or hydropower, or wind farm (or tidal powerplant, or some other weird ones) there's no place for steam to be involved (solar thermal plants sometimes use steam cycle). Geothermal powerplants use steam if source is hot enough, otherwise it's something more volatile in organic Rankine cycle