Shares of EnerNOC (ENOC), which provides energy management applications, services and products for commercial, institutional, and industrial organizations, rose in early afternoon trading after the EPA finalized revisions to clean air standards for stationary engines. The Environmental Protection Agency said earlier today that the final revised rule will reduce the capital and annual costs of the original 2010 rules by $287M and $139M, respectively, while reducing harmful pollutants. Research firm Pacific Crest wrote in a note to investors on January 3 that the final EPA rule on the use of diesel backup generation for emergency demand response will have only a limited impact on EnerNOC, regardless of how the EPA rule looks. Pacific Crest said at that time that it thinks the company can meet its 2013 guidance and maintained an Outperform rating on EnerNOC shares. In early afternoon trading, EnerNOC rose $2.22, or 17.68%, to $14.78.