The Colorado Sun Excel Energy’s Comanche Generating Station, shown here in a March 7, 2020 photo, is the largest power plant in Colorado. The steam-driven, coal-fueled plant, located in Pueblo, generates 1,410 megawatts of power. Mike Sweeney/Special to The Colorado Sun For more than a year, frustrated Colorado lawmakers and environmental groups have struggled to push the Polis administration to move faster to meet mandated cuts in greenhouse gas emissions. Now they are advancing a bill to set emission caps and deadlines — over the objections of the governor. The Senate Transportation and Energy Committee moved Senate Bill 200, which includes the caps and a one-year deadline to get them into rules, on to the finance committee on a 4-3 vote Tuesday, with all Democratic legislators supporting the measure and all Republicans opposing it.