By Nicole Friedman 

Louis Dreyfus Energy Services LP has agreed to pay $7.8 million in penalties in connection with a Federal Energy Regulatory Commission investigation into alleged market manipulation between November 2009 and February 2010, the commission said Friday.

The company didn't admit or deny any violations.

Louis Dreyfus Energy Services has agreed to pay $3.7 million to the Midcontinent Independent System Operator, which operates the power grid in the Midwest, and $4.1 million to the U.S. Department of Treasury, the commission said. A trader, Xu Cheng, will pay the Treasury Department $310,000, the commission said.

The commission's enforcement office said it found that Louis Dreyfus Energy Services "inflated the value" of financial instruments it had purchased to protect against fluctuations in power prices through virtual trades it placed with the power-grid operator in North Dakota. "This conduct manipulated the MISO market," according to the order issued Friday.

Louis Dreyfus Energy Services was a subsidiary of Louis Dreyfus Highbridge Energy LLC at the time. Louis Dreyfus Highbridge Energy was jointly owned by global commodities firm Louis Dreyfus Holding BV and J.P. Morgan Chase & Co.-owned hedge fund Highbridge Capital Management LLC. Louis Dreyfus Highbridge Energy was purchased in 2012 by DF Energy Acquisition LLC and renamed Castleton Commodities International LLC.

Castleton didn't immediately respond to a request for comment.

Louis Dreyfus Energy Services has no history of violations, according to the order, and agreed to stricter compliance measures and monitoring.

FERC has broadly cracked down on market manipulation in recent years. J.P. Morgan Chase & Co. agreed in July to pay $410 million to settle accusations that it manipulated electricity prices between 2010 and 2012.

Write to Nicole Friedman at nicole.friedman@wsj.com

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