Edison International, owner of California’s largest electric utility, said it will be difficult to keep increasing its use of renewable energy as the latest goal set by Governor Arnold Schwarzenegger stretches limits on the ability to manage such power sources.

“It’s a goal we should be behind,” Chief Executive Officer Ted Craver said today in an interview in New York. “The issue isn’t to try to kill it or try to knock it out of the box, but to try to figure out how to satisfy that in a way that doesn’t put the system at undue risk.”

Under a November proposal that legislators may make law this year, Schwarzenegger said utilities should derive 33 percent of their power from renewable sources by 2020. California regulators already are considering allowing use of tradable renewable energy credits to help utilities meet a 20 percent renewables mandate by the end of next year.

Edison will have to tap into additional clean power sources outside the state to meet expanded mandates and keep costs under control, Craver said.

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