Here in TX (somewhat unusual, granted) I pay about $0.05/kWh for the wholesale power and about $0.04 for the "delivery charges" i.e. being hooked up to the grid

Here in TX (somewhat unusual, granted) I pay about $0.05/kWh for the wholesale power and about $0.04 for the "delivery charges" i.e. being hooked up to the grid, etc. The truly wholesale market tends to be $0.01/kWh any time other than 11am-7pm and anywhere between "some more" and "lots, lots more" than that during the 11am-7pm window. At some point it starts to become more economical to install extra solar to make sure I never touch the grid during the day. And eventually as battery prices come down and homes get more efficient it also becomes more economical to install batteries and even more solar to not touch the grid at night. This may not be how retail power is priced everywhere but I suspect that wholesale power is priced similarly in a lot of places that get some sun and some wind so long as you're not really, really remote. It'll be interesting to see how this all plays out over the coming 5-10 years.