July 21 (Reuters) - Kinder Morgan said on Wednesday its second-quarter profit fell 62.4% from the previous quarter, when the U.S. pipeline operator saw a one-off demand surge for natural gas and electricity due to a winter storm in February. Adjusted profit stood at $516 million, or 23 cents per share, in the second quarter ended June 30, compared with a profit of $1.37 billion, or 60 cents per share, in the first quarter. Reporting by Rithika Krishna in Bengaluru; Editing by Krishna Chandra Eluri Our Standards: The Thomson Reuters Trust Principles.