YOU have to pay the energy company for the extra electricity you put into the grid! Like… What‽‽‽

That might be logical in some situations. Where there’s surplus in the grid and it plays the role of amortizer of what you give it. They can’t just shut you off when they are getting too much load. Or they can but prefer to have a soft curve where you get less and less until you start paying for what you give.

Like water is a resource, but you do pay for water disposal (that is, I live in Russia, and there’s a separate line on the bill for what goes into sewers), or, if someone provides passive cooling service somewhere, you might pay for the heat you give away. Even if that’s energy.