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See-Through Windows Make Clean Electricity From Raindrops
(cleantechnica.com)
This is a most excellent place for technology news and articles.
Honestly, if this was all it did I'd want it. Our house is south facing and the front of the house gets very hot in summer. Windows that effectively limited the amount of heat that could come through would help a lot - even if, as you say, it doesn't actively cool
That kind of window has been around for a long time already. Also, let me introduce you to window awnings