A committee formed by the California Energy Commission is looking into a “unexplained surcharge” that has costed California drivers upwards of $17 billion since February 2015. Severin Borenstein, the UC Berkeley professor who led the advisory committee that authored the report, believes the cost of gas in California has far outpaced other states, even after accounting for the Golden State’s taxes and regulations. A representative for the Western States Petroleum Association cited the law of supply and demand, and explained that many of California’s regulations raise the cost of production.

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