Calcination can also use low-duty-cycle electric kilns that soak up spare solar panel electricity (from overprovisioning), at least once you have 2-3 days of st

Calcination can also use low-duty-cycle electric kilns that soak up spare solar panel electricity (from overprovisioning), at least once you have 2-3 days of storage to level solar fluctuations and day/night (big, cheap ovens take a while to heat up). In general, they are quite amenable to using electrically heated air in place of methane/air combustion exhaust.