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State Atty. Gen. Kamala Harris has issued subpoenas to oil refiners as part of an investigation into unusually high gasoline prices in California during the last year.

Chevron's El Segundo Refinery is seen on April 28, 2006. (Credit: David McNew/Getty Images)
Chevron’s El Segundo Refinery is seen on April 28, 2006. (Credit: David McNew/Getty Images)

California drivers paid pump prices that were as much as $1.50 higher than the rest of the nation since last summer.

Gordon Schremp, senior fuels analyst for the California Energy Commission, said he was aware of Harris’ investigation of the state’s refiners. He said the attorney general’s office has requested significant information dating back to 2015 on the oil refineries, their imports and exports.

Kristin Ford, a spokeswoman for Harris’ office, said she could neither confirm nor deny whether the agency is investigating the refineries; news of the probe was first reported Thursday by the Wall Street Journal.

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