Good idea. So you aren't storing it for later use, you're making use of the energy when you have it for a non-traditional purpose. You'd still be screwed in the cloudy wintertime.
The opportunities could come around a common waste product that can be melted or crushed slowly into something better.
So sawdust, wood chips, plastic, glass, aluminum cans, etc as a feed product that you put in a big hopper.
Turned into glass tiles, aluminum ingots, etc
Maybe run a pellet mill for making wood burning pellets?
An annoying one that I don't like is bitcoin mining.