Government investigators have found that JPMorgan Chase devised “manipulative schemes” that transformed “money-losing power plants into powerful profit centers,” and that one of its most senior executives gave “false and misleading statements” under oath. The findings appear in a confidential government document, reviewed by The New York Times, that was sent to the bank in March, warning of a potential crackdown by the regulator of the nation’s energy markets. ...The JPMorgan case arose, according to the document, after the bank’s 2008 takeover of Bear Stearns gave the bank the rights to sell electricity from power plants in California and Michigan. It was a losing business that relied on “inefficient” and outdated technology, or as JPMorgan called it, “an unprofitable asset.” Yet under “pressure to generate large profits,” the agency’s investigators said, traders in Houston devised a workaround. Adopting eight different “schemes” between September 2010 and June 2011, the traders offered the energy at prices “calculated to falsely appear attractive” to state energy authorities. The effort prompted authorities in California and Michigan to dole out about $83 million in “excessive” payments to JPMorgan, the investigators said. The behavior had “harmful effects” on the markets, according to the document.