For most days in 2017, the share of electricity generated from natural gas has been near or below previous five-year (2012–16) minimums in the California Independent System Operator (CAISO) region. Rising hydro and solar power output lowered the overall contribution of gas, but there are fresh concerns over a repeat in gas shortfalls this summer, with operating restrictions on SoCalGas's Aliso Canyon field still in place.
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