do you alsl expect a paleontological museum to only employe dinosaurs?

I don't, but I wish they did.

It doesn’t say “coal mining is a great technology of the future”.

I mean, it very well might. Wouldn't be the first museum bankrolled by the wealthiest industry in town. But saving money on electricity costs is a thing a lot of businesses do for their own bottom line while advocating other people stick to the expensive way.