A New Solar Panel Shield Made From Onion Peels Outlasted Industry Plastics in Tests
(www.zmescience.com)
I see you're making a joke about it actually being worse for the environment.
But serious answer: I think they'll be sourced from companies using bulk onions as an ingredient, who can now sell the skins for a profit, thus lowering the prices of those end products while keeping the prices of onions the same.