@sonhouse saidpower output 3-4 mW...so a nice gimmick and maybe a solution for remote sensing devices.
https://techxplore.com/news/2019-02-flags-energy-sun.html
Flexible solar cells coupled with piezo effect.
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@Ponderable
Don't forget, that is for openers. That technology could be used on sailing ships too.
I dreamed of sails that were solar cells also. Adding piezo would make for that much more energy.
I was thinking a sail ship where the sails were also solar, could charge batteries that could get you out of the doldrums without having to fire up a fossil fuel engine. Get you into port when there was no wind.
I wonder if that kind of tech would ever be legal on the America's cup? Power only from the sun and wind, no fossil fuel burning.