Julia Pyper for GTM:  A growing number of electric industry leaders agree that it’s only a matter of time before renewable energy resources dominate their grid systems.

In California, it’s already a reality, said Steve Berberich, president and CEO of California Independent System Operator Corporation. On a typical day, CAISO will pull about 30,000 megawatts of energy production, with around 6,500 megawatts from solar, 5,000 megawatts from wind and another 5,000 from geothermal and other services on the system. In addition, California’s grid system has roughly 4,000 megawatts of behind-the-meter solar, which is growing at a rate of about 70 megawatts per month.

In any given day, California gets more than 30 percent its electricity from renewable energy. On many days that amount climbs to 40 percent, and on some days renewables reach 50 percent, said Berberich.

“Now we have to think about the system as a renewable energy-based system complemented by other things,” he said, speaking at the Edison Electric Institute’s annual convention this week in Chicago.  Cont'd...