A passing cloud can be curtains for a solar-electric system, suddenly cutting generation dramatically. Production shoots back up as soon as the cloud is past. Then it ends at sundown, only to resume at dawn. Wind energy is also intermittent.
Electric utilities can accommodate these fluctuations in modest amounts, but adding lots of distributed solar generation on rooftops and in backyards could complicate a system designed to keep electrical current flowing steadily.
via California Project to Demonstrate Use of Batteries to Store Solar, Wind Power.
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