Access to more power producers over a wider range of the West could lower rates, but Wyoming regulators will monitor the market to see if it penalizes the state’s coal, oil and gas over the next five years.By Jake BolsterWyoming’s largest utility today began participating in a new ‘Extended Day Ahead Market’ for electricity on the Western grid, a potentially landmark shift in the way energy is sold in the state that could lower rates as energy costs soar.