Government bureaucrats & commies think any reason is good enough to extort money form those who have it, but is it ethical?
Unless the house/building is disconnected from the grid it can and will draw power from the utility when the sun is not shining. Even if batteries are installed the grid is still there as a backup. The building may use less power but that just makes it’s share of the grid more expensive because the power company cannot recover infrastructure costs through electricity sales. Also, if regulation says that the power utility must buy back electricity at retail rates, those retail rates are in part determined by the cost of maintaining the infrastructure which a solar installation owner does not do.
Obamacare for utilities. ..
Saw it coming....
It is “ethical” only from the perspective of those parasites that receive it!