According to Wald's article, "solar power is growing so fast in California...that it is turning the stat's power system upside down". This new system uses a technique we have known about for some time now, but it uses it in a more creative way, working in the opposite direction. The original idea was to "use batteries to store power at night form traditional sources...and run them down in the peak heat of late afternoon". But, in California, the sunset is when there is the most sun available, so the panels "keep operating in the late afternoon, when the output from solar panels eliminates the need for their electricity".
The only issue with this new method is that they sometimes find they have too much power than they have use for, called an "oversupply". As far as I can tell, it's better to have too much than not enough and it's impressive that California has such a handle on this innovative solar panelling technique, using their own resources to their best ability.
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