Water isn't the only resource running short in California. The drought-stricken state is also low on natural gas.
With a move that usually comes in the height of summer when temperatures are soaring and air conditioners blasting, Californians were urged to voluntarily cut their electricity use after frigid weather across the U.S. and Canada caused a shortage of natural gas at Southern California power plants.
The so-called Flex Alert, in which residents are asked to turn off unneeded lights, avoid using large appliances or equipment, and turn off electrically powered heaters, was allowed to expire at 10 p.m. Thursday, nine hours after it began.
(Read more: Cold blast pushes record natural gas demand)
The shortage was only in Southern California, but the north was asked to do its part too.