Solar + battery installation in Oklahoma

Net metering: Monthly netting at retail; surplus at avoided cost

The Oklahoma Corporation Commission requires investor-owned utilities, including OG&E and PSO, to offer net metering for solar systems up to 300 kW. The mechanism has two halves and they are worth separating. Within a billing period, your generation offsets your consumption at the retail rate, so midday production offsets evening usage in the same month before anything is treated as surplus. That is the valuable half, and it puts Oklahoma ahead of states like Georgia and Indiana that measure instantaneously. The second half is less favourable. The Commission rules do not require utilities to compensate genuine surplus at the full retail rate, and both major utilities credit excess beyond your usage at avoided cost, in the region of 3 to 5 cents per kWh against an Oklahoma residential average around 13.4 cents. PSO uses monthly netting with a twelve month carry-forward of excess credits, and OG&E runs an annual true-up, typically in April, at which remaining excess is compensated at avoided cost. The design conclusion follows directly and is unusually clean: build to your consumption and no further. A system matched to your annual usage captures the retail-rate offsetting almost entirely, while every kilowatt hour beyond that is worth roughly a third as much. Municipal utilities and rural electric cooperatives serve a substantial share of the state and set their own terms, so confirm which arrangement applies at your address.