BBC.co.uk
18 July 2012 Last updated at 13:02 ET
Energy regulators have subpoenaed the
emails twice as part of an investigation
US authorities investigating claims JPMorgan manipulated the electricity market have challenged the bank's refusal to hand over subpoenaed emails.
The Federal Energy Regulatory Commission (Ferc) is looking into complaints from grid operators in California and 11 Midwestern states.
The bank is accused of profiting from loopholes in the bidding process to drive up prices by some $73m (£47m).
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