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The next time your electricity bill prompts you to curse your local utility, here’s another target where you should direct your anger: JPMorgan Chase & Co., which has manipulated the California energy market for its own profit and at a cost to residents and businesses in the state that could be $100 million, $200 million or much more.

That’s the accusation leveled by the California Independent System Operator, which has jurisdiction over 80% of the state’s electrical transmission. The ISO, a nonprofit corporation controlled by the state government, estimates that JPMorgan may have gamed the state’s power market for $57 million in improper payments over six months in 2010 and 2011.