Earlier this week, the 10th Circuit Court of Appeals vacated EPA’s disapproval of Wyoming’s regional haze plan for the PacifiCorp’s Wyodak power plant. The basis for the disapproval was an issue near and dear to my heart. In rejecting Wyoming’s SIP, EPA repeatedly pointed to Wyoming’s failure to comply with EPA’s guidelines for determining Best Available Retrofit Technology, even though the guidelines were not enforceable regulations. … More