Private citizens with solar panels or wind turbines are connected to the same power grid as everyone else. When their equipment produces more power than they need, they are reimbursed for that excess power by the power companies. They are selling power on the grid but don’t have to pay to maintain the grid. That shifts more of this cost to consumers not using renewable energy equipment.
We help pay for their equipment through tax incentives. If they are going to receive payment for energy they sell, they should also help with the cost of distributing that energy.