Lot of comments about RTGs, but I don’t think that’s what OP is asking. RTGs convert heat to electricity, same as a conventional power plants — they just do it in a solid state way instead of steam. In RTGs it doesn’t matter where the heat comes from; they are not really analogous to solar cells, as the title asks.
In fact, there are consumer products that use the same technology — you can buy a little electric fan that sits on top of a wood stove and, once up to temp, will start spinning. The electricity is generated by the thermal gradient using heat from the stove, essentially the same as an RTG.
I get that it’s a meme, but what’s the problem? I’m vegetarian/flirt with veganism; it’s purely for moral/ethical/environmental reasons.
Indian food is delicious. An Impossible burger on a pretzel bun dripping with grilled onions, avocado, vegan aioli and mustard with a side of steak fries? That’s also delicious, in my opinion.
Meat is delicious, and that’s not at all incompatible with my reasoning for being vegetarian.