> Because the individualized incentives do not take into account the community benefits.

Only if the utility company is pricing things incorrectly.

If the price of electricity is ~free during the day and expensive in the evening then the individualized incentives for installing a battery line right up.

> Your attitude that somehow taxation is theft is a very silly Ayn Randian Objectivism outgrowth that has never been true, even in the most "free" US states.

Whether it's theft or not doesn't change the arithmetic. When you're paying them the money they're paying you, it was your money to begin with.