By Rob Nikolewski, Los Angeles Times
 
California’s years-long drought put hydroelectric power flat on its back.

But one of the cleanest and cheapest energy sources may be poised for a comeback as the state has been drenched with rain and its mountains blanketed in snow in recent months.

Energy officials studying the numbers are cautiously optimistic the sector’s output may roar back to levels seen before drought decimated watersheds, streams and reservoirs.

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