Reuters: The Intermountain Power Agency said on Thursday it will not continue efforts to seek an air permit for a third 900-megawatt coal-fired power unit at its plant in Utah. The Sierra Club said the once-proposed Unit 3 at the Intermountain power station 120 miles southwest of Salt Lake City is the 100th coal-fired power plant to be scuttled since 2002. IPA spokesman John Ward said allowing an application for an air permit to expire was a formality as plans for the plant have not …