With greenhouse gas caps on the horizon, more U.S. utilities now have another reason-besides tightening air pollution limits-to considering replacing some of their old coal-fired plants with less-carbon-intensive gas-fired capacity. Even local residents are pleased with the results of an Xcel Energy project to do just that in St.Paul, Minnesota. For Xcel, the key ingredient in the recipe for its recently commissioned High Bridge plant was hiring an EPC contractor smart enough to overcome formidable site constraints.