Oh, I guess it'd been a couple years since I viewed the rate tables. In my mind peak prices were closer to $0.30. My mistake. The point is that the 1:1 ability

Oh, I guess it'd been a couple years since I viewed the rate tables. In my mind peak prices were closer to $0.30. My mistake. The point is that the 1:1 ability to exchange power you generate for power to consume is a better deal than anyone else gets: Half of the per-kWh cost of electricity PG&E sells goes toward transmission (aka maintaining poles and cables) and half toward the actual generation. If you produce 1 kWh at noon, and consume one at 8 pm, you pay 0, so contribute nothing toward the poles that provided that electricity to you when you needed it. So in the end, you paid $0 for that net neutral exchange, while PG&E received $0.40 from the other customer. They paid ~0.15 for the kWh they provided to you. Overall that means that they delivered 2 kWh over their lines and got $0.25, which is half of what they would have otherwise gotten for delivering 2 kWh over their lines.