Ha ha, I think you are right. Weird.

What's up with the key? Is it just random? That needs to be fixed, it's not beautiful.

Solar power. Use parabolic mirrors, track the sun, heat up the Stirling engine. The prototypes worked, and worked well. Better than photovoltaic cells.

The trick is manufacturing the Stirling engines, which.... is not easy.

I grew up in Amish country (even been to an Amish wedding reception), and know they use steam engines... never a Stirling engine. But those steam engines are beautiful.

I interviewed at a company that was planning on building Stirling engines back in 2008. They told me (no idea how true) that other than little toys and novelty sterling engines, there were less than 300 large sterling engines in the world (and they wanted to produce 3000 a month). They went out of business.

Wait? I wasn't aware that the Amish used sterling engines. I'd love to hear more. Do you have any info on these?

Did you mean steam engine? Sterling and steam are different...

Of course, steam engines are a solution that the Amish use... I've just never heard of the Amish using high tolerance machining to build a stirring engine.

Boom. You won't get a better, simpler answer than this.

Even tossed in the Stirling engine answer at no cost. (your fan is thermoelectric, but technically a Stirling engine would work.)