On June 13, the U.S. Environmental Protection Agency (USEPA) indicated that it would take additional time to review input on proposed greenhouse gas emissions limits on New Source Performance Standards for new and existing power plants. The Agency stated that it will propose the new rules by September 30, 2011, instead of the original deadline of July 26. USEPA still plans to finalize the rules in late May 2012.

New Source Performance Standards are technology-based emissions limits issued under Section 111 of the Clean Air Act that apply to new and in some cases existing facilities in a specific industrial sector. NSPSs are a set of rules distinct from (and potentially broader than) the Tailoring Rule, the set of regulations now in effect to control greenhouse gases from large industrial sources. The proposed NSPS will apply to all sources within a source category and, in this case, the source category is power plants. Currently, under the Tailoring Rule, USEPA only requires the largest industrial facilities to obtain prevention of significant deterioration permits under new source review provisions of the Clean Air Act when they expand or make modifications that increase emissions. Those permits require the facilities to install best available control technology, which is determined for each individual facility, while the NSPS impose uniform emissions limits for the industry nationwide.

The extension will also not affect USEPA's deadline to propose performance standards for petroleum refineries by December 15. As we discussed on the blog in December 2010, this is a separate settlement agreement that requires USEPA to issue the final petroleum refinery rule by November 15, 2012 (See American Petroleum Institute v. EPA, D.C. Cir., No. 08-1277, settlement reached December 23, 2010).