> what if the sun and wind stop simultaneously for 2 months Forget about two months, the cost to battery store just for two or three days is enormous. At the s

> what if the sun and wind stop simultaneously for 2 months Forget about two months, the cost to battery store just for two or three days is enormous. At the same time, it does not happen often enough to justify the cost over just using natural gas as a backup, so that is how it is done.