The Indiana Court of Appeals said CenterPoint isn't doing the right math when it comes to paying people with solar panels for the excess energy they deliver to the grid. The case could have big implications for other large utilities in Indiana.

The utility plans to close most of its coal units and get more than 60 percent of its power from solar, wind and battery storage by 2025.

The Indiana Office of Utility Consumer Counselor and six other groups want Indiana to deny CenterPoint Energy's request to give people with solar panels fewer credits for energy they deliver to the grid.

Vectren, which serves a significant portion of central and southern Indiana, has had some of the highest rates in the state. The merger with Houston-based CenterPoint Energy will not reduce rates immediately.