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
Then it’s just heat transfer medium for most of geothermal powerplants too, because from what i understand, most of the time condensed water is recycled (and source of energy is just “hot rocks” anyway)
then if you look at the bigger picture, all that energy can be traced back to either sun, nuclear fission (in reactors) or nuclear decay/primordial heat (geothermal)
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
Hydroelectric is just liquid steam, and wind is just cold, thin steam.
I’m referring to the root energy source, rather than how it’s transferred.
Then it’s just heat transfer medium for most of geothermal powerplants too, because from what i understand, most of the time condensed water is recycled (and source of energy is just “hot rocks” anyway)
then if you look at the bigger picture, all that energy can be traced back to either sun, nuclear fission (in reactors) or nuclear decay/primordial heat (geothermal)
“Root” energy source really just depends on where you draw boundaries of thermodynamic system in question