This seems like an edge-case scenario. And, wide-spread home solar arrays might actually make EV systems more resilient in some disaster scenarios.
If you live in a disaster zone, an EV might be still be your daily commuter, even if you've got a Jeep with a winch, water-filters, and fully packed go-bags in the garage.
EIA says our power-grid is about 64 percent fossil fuels, so coal provides about 27.5 percent of the total electricity production and natural gas is about 35 percent; meanwhile nuclear is about 19.4 and renewables are about 16.9 percent.
Coal is decreasing rapidly, mainly out-competed by natural gas production, with solar and other renewables also growing rapidly. One note also, the EIA projected that by 2050, solar and natural gas will be the dominant energy sources in the U.S. and nuclear may collapse almost entirely.
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