That depends on how often you can use the equipment. The company I work with pours cast iron in one factory - if you get a job there you work the overnight shift because that is when power is cheap. Since energy is the main cost of melting iron (it takes a lot of energy to get to get over 1100c) we are willing to let the equipment be idle and pay the workers extra to work a shift that doesn't work with the rest of the world.

Planned maintenance in that factory is worked with the power company. I'm not sure if that means they are also doing maintenance on some power plant, or if that means during Christmas lights season.

If you can predict high wind times a week in advance I'll work my energy hungry production around your cheap energy prices. The only thing I need is some sort of guarantee that those times will happen "often enough". I can pay employees to work 60 hour weeks some months, and other months get paid vacation, so long as over a full year I get reasonable use of my factory and there is some prediction.