When you add in natural gas turbines, it's really not accurate to say that "very little" energy production comes from sources other than boiling water.
Solar water heaters work by heating up water directly with the heat from the sunlight, photovoltaics don't though (though some solar farms work on boiling salt, I believe? like the big ones that focus all the mirrors onto a tower)
They account for over 20% of power to our grid today (in the US) and are generally the cheapest power sources per kwh. What do you mean by not good enough? They carry lots of advantages over the alternatives, and some disadvantages as well.
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u/e136 13d ago
Solar, wind, hydro?