Associated Press: Duke Energy detailed a strategy Tuesday to expand its renewable energy unit by selling 99 megawatts of electricity from a Wyoming wind farm and purchasing wind turbines to produce 150 megawatts of electricity at future projects. The Charlotte, N.C.-based company said it has signed a 20-year agreement to sell all electricity generated at a new wind farm near Casper, Wyo., to PacifiCorp to serve customers in Wyoming, Utah, Idaho, Oregon, Washington and California. Duke Energy …