It seems like an unreservedly good thing if people with home batteries can help prevent brownouts and reduce prices for everyone else. Also, I believe the $150/day figure was during a rare heatwave event when prices had surged to 100x their typical value ($5/kWh). It’s like any other investment where you outlay cash upfront and hope to make it back over time, whether via reduced costs for your own electricity usage or selling it back to the grid when doing so is profitable.

Makes sense to me. Peaker plants are typically expensive (even at idle) and polluting.

During peak need, renting some capacity from subscribers already on your grid means you don't need to build another peaker plant.

What is wrong with this?

Yes, only the billionaires have the right to make money. Think of the horror of any person making money by producing/storing energy!

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