In September the Mascoma Corporation’s Frontier Renewable Resources LLC wood-chips-to-ethanol project was issued an air permit by MDNRE, with construction scheduled to start next spring near Kinross and ethanol production expected in 2013. In early December an appeal of the permit decision was filed by the Sierra Club. Alleged permitting errors include the use of less stringent emission standards due to assuming only half the anticipated production and using corn ethanol production data when developing emission estimates for the wood ethanol production.  Frontier has recently announced that the Sierra Club has now withdrawn its petition.