Then charge a distribution fee. The should buy and sell power at the same rate and only charge for infrastructure use.
Utilities as they are monopolies the law forces me to buy from should not be for profit.
Not so. APS is one of the owners of the Palo Verde power plant, the largest nuclear plant in the U.S. That plant, for instance, has fixed costs to run no matter what level they are generating at. It is like when during the gasoline shortage that the States had to raise the taxes on gasoline because the lower income from reduced gas sales didn't cover the costs to maintain the roads. If electricity is supplied from outside, APS, Salt River, etc all still have to pay the costs of running and maintaining Palo Verde. If they can't get the costs from selling the power they generate, they will have to raise rates on their customers to cover that shortfall. I get my electricity from APS and for the record, I am also a retired APS employee. If all the power was generated by someone other than APS you would still have to pay APS to for the maintenance costs of their distribution system, expansion of that system for new houses built in their area, reading your meter and providing a billing mechanism. Capitalism doesn't work when there is one wire, or one pipe coming to your home. We pay for that service, water, landline telephone, sewer and Internet and hope the folks we elected to the Corporation Commission will have our best interests at heart and not let those utilities abuse us. Solar users are pumping their excess power into APS' grid and should have to pay their fair share of the cost to maintain it. It's not up to us non solar customers to subsidize it. This is my personal opinion not APS'.