On November 28, 2014 - the Department of Energy issued a proposed rule that will impact commercial and industrial compressors. From the summary of the proposed rule:
"The U.S. Department of Energy (DOE) is considering establishing energy conservation standards for commercial and industrial compressors. To date, DOE has considered energy conservation standards only for compressors intended to compress air, rather than natural gas. As a result, DOE's current efforts have focused on air compressors. However, DOE is also aware that compressors used to compress natural gas may also use a substantial amount of energy. To improve its understanding of both the technology and market of natural gas compressors, DOE will hold a public meeting to discuss and receive further comments and supporting data about the characteristics and energy use of this equipment as described in the request for information (RFI) published by DOE on August 5, 2014 (79 FR 45377)."
More information on the rule can be found here.