At to end of the day it comes down to this:

Is it cheaper to store steel stock in a warehouse or terrawatt-hours of electricity.

Is it cheaper to perform maintainance on 2 or 3x the number of smelters or is it cheaper to maintain millions of battery or pumped hydro facilities?

I’m sure production companies would love it if governments or electrical companies bore the costs of evening out fluctuations in production, just like I’m sure farmers would love it if money got teleported into their bank account for free and they never had to worry about growing seasons. But I’m not sure that’s the best situation for society as a whole.