The U.S. Federal Energy Regulatory Commission (FERC) ordered Barclays and four of its power traders to pay fines totaling $453 million on Tuesday, saying the bank manipulated California's electricity markets last decade.
The fine, first proposed in October 2012, must be paid within 30 days, FERC said on Tuesday.
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Barclays has contested FERC's findings and has previously said it will fight the order in court.
(Reporting by David Sheppard and Matthew Robinson; Editing by Jan Paschal)