Sierra Power (Nevada) has net metering on the same extra-generation-is-a-gift basis.
But in addition to doing it monthly you can arrange for an annual net-meetering interval, so you can "store power" on the grid in sunny or windy months and consume it during darker, calmer times.
They also had a separate arrangement (from before the net metering days, when you needed a two-meter system) where you can have a separate drop to your genny site and group the bills, so you're effectively using the grid to get your power from a remote genny to your house in addition to using it as a big battery. I assume that's still available.
I'm not actually using either (or even generating my own juice at the moment). Don't plan to, either, unless the price of grid-tie inverters comes down a whole bunch or the price of power goes 'way up. Or if it turns out to be cost effective to use a grid-tie inverter to perform the automatic switchover for the emergency backup circuits to keep the fridge, well, and furnace alive during outages.
(I'd have gone with alternative power from day one except the damned contractor called the power company and spent the money earmarked for A.P. to run the line before I caught him.)