That's how net metering works for me in Oregon, too - I earn credits by over-producing all summer, and then use some of them up until Jan 1, as they won't roll

That's how net metering works for me in Oregon, too - I earn credits by over-producing all summer, and then use some of them up until Jan 1, as they won't roll over year-to-year. As a result I gave power away for free to the grid for several years, but now I have a plug-in hybrid to soak up the surplus.