Reuters: Wal-Mart Stores Inc said on Thursday that it had entered into a partnership with Duke Energy to have wind power supply up to 15 percent of its energy load for roughly 360 of its stores and facilities in Texas. Wal-Mart, the world’s biggest retailer, said it expected by April to begin obtaining electricity from a Duke Energy wind farm under construction in Notrees, Texas. “We’re purchasing renewable power at traditional energy rates,” Kim Saylors-Laster, vice president of energy …