The Rocky Mountains can be seen in the distance as wind mills generate electricity at the Ponnequin Wind Farm near Carr, Colo., on Monday, Jan. 29, 2007. A new report by two environmental groups warns that plans for more coalfired power plants in the Southwest will worsen the threat of global warming and undermine the states conservation efforts. A spokesman for a major Western electricity supply say that coal is economic and reliable but utilities are looking for ways to expand their use of renewable energy.