Utilities need fast-reacting ways to deal with rapidly changing generation from sources such as wind and sun. Large users can get a big benefit from reducing their theoretical peak usage, reducing their grid connection charge. Both of these usages are economic today.

Utilities have to have excess capacity available to spin up instantly to meet demand. So you have to compare the cost and maintenance with a natural gas peaker plant. I think there is a place for Tesla's PowerPack to replace the least used peaker plants.

Tesla PowerPacks are already replacing three peaker plants (that I know of).

The more expensive the peaker, the faster the payback time.

One way would be the same sorts of regulations that have them paying to haul away old appliances.