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SACRAMENTO, Calif. (AP) _ California's attorney general sued four more energy companies Tuesday for more than $1 billion, accusing them of overcharging the state during its power crisis.

The lawsuit brought by Bill Lockyer names Mirant Corp., Williams Energy Marketing and Trading Cos., Coral Power and Powerex Corp. Lockyer is suing under the state's unfair business practices law.

California went through rolling blackouts more than year ago in a power crunch blamed in part on soaring wholesale prices and California's attempt at deregulation of the energy industry.

Last month, Lockyer sued Mirant, Williams, Reliant Energy and Dynegy, accusing them of double-billing California for electricity purchases.

Mirant, Williams and Coral did not immediately return calls. Powerex had no comment.