(Bloomberg) -- Millions of Californians might faceblackouts this summer unless energy providers take steps includingremoving natural gas from the Sempra Energy storage site, which wasclosed after a historic leak.

Without tapping the site, power plants may not have enoughaccess to natural gas on as many as 14 days to produce electricityin Southern California during certain peak-use times, according toa draft report issued Tuesday by agencies including the CaliforniaEnergy Commission, the California Public Utilities Commission, theCalifornia Independent System Operator and the Los AngelesDepartment of Water and Power. Fifteen billion cubic feet of gas isstored at Sempra’s Aliso Canyon field near Los Angeles.

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Other recommended measures to limit energy shortages includeencouraging customers to conserve use during the hottest summerdays. The agencies will take public comment before completing theactions, which were spurred by Governor Jerry Brown’s executiveorder in January, said Robert Weisenmiller, chairman of the energycommission, in a conference call with reporters Tuesday.

Site’s role

“Aliso Canyon plays an essential role in maintaining both naturalgas and electric reliability in the greater Los Angeles area,” saidMark Rothleder, vice president of the California Independent System Operator, during thecall. “The facility’s limited current operations create a distinctpossibility of electric service interruptions in the coming summermonths.”

The Aliso Canyon leak, whichlasted almost four months, sickened residents and spewed theequivalent of a year’s worth of greenhouse-gas emissions from morethan 500,000 cars. The leak was plugged in February.

In response, state agencies called for a stop to more storage atthe site until a safety review of its wells is completed, limitingthe use of one of the largest reservoirs in the country.

State officials said in a statement that its plan to addressshortfalls, which include 18 measures, “will reduce, but noteliminate, the risk of gas shortages this summer that are largeenough to cause electricity interruptions.

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