DENVER (AP) -- An environmental group is asking a federal appeals court to review part of Colorado's plan for cutting air pollution and haze.
The U.S. Environmental Protection Agency last year approved Colorado's strategy, which included plans to retire some coal-fired power plants and switch others to run on natural gas.
WildEarth Guardians said Tuesday it is objecting to a section that it says requires Tri-State Generation and Transmission Inc. to install updated pollution controls on just one unit at its plant in Craig. It wants the 10th U.S. Circuit Court of Appeals to review whether the plan violates the Clean Air Act.
Tri-State spokesman Lee Boughey counters that the plan includes alternate measures with stronger emissions requirements. Boughey also says Colorado's haze plan had support from other environmental groups.
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