CO2 Emissions Regulations from EPA Narrowed by Supreme Court
Since the US Supreme Court affirmed in 2007 that the Clean Air Act (CAA) provides the EPA with authority to regulate CO2 and other greenhouse gases, EPA has pursued a growing set of regulatory initiatives. In each, EPA has attempted to fit GHGs into statutory and regulatory programs originally designed for more conventional pollutants â and the entities it targets have sued the agency claiming the stretch to GHGs exceeds EPAâs authority. Each court decision has adjusted the contours of EPAâs CAA authority, legitimizing some stretches and vacating others.
On June 23, the US Supreme Court capped four years of litigation over EPAâs so-called Tailoring Rule (Utility Air Regulatory Group v. EPA). This decision affirms in part and reverses in part an underlying District of Columbia Circuit Court decision from 2012 (I wrote about that decision here).
What Did EPA’s Tailoring Rule Require?
EPA asserted authority to use GHG emissions as the sole basis for requiring a major source to obtain a Prevention of Significant Deterioration (PSD) permit for construction, and a subsequent Title V permit for ongoing operations. Both these permit programs are designed for conventional and hazardous air pollutants. EPA decided to âtailorâ the threshold emissions levels above which to require PSD and/or Title V permits, recognizing that emissions of CO2 and other GHGs are much higher per unit of fuel than other combustion generated, so that much smaller sources would be classified as âmajorâ if the standard thresholds were applied. The Tailoring Rule set the following thresholds:
- For sources emitting 100,000 tons per year of CO2 and CO2âequivalent other GHGs, even if no permit is required for other pollutants (much higher thresholds than the 10-100 tpy used for other pollutants (such as NOx and CO2).
- Add GHG control requirements to permits for sources that exceed thresholds for other pollutants (for example, fossil fuel power plants subject to NOx and SO2 controls), if GHG emissions exceed 75,000 tpy of CO2-e (âanywayâ sources).
What Did the Supreme Court Just Decide?
The nine justices split into three groups: Justice Scalia wrote the opinion, and was joined in full by Chief Justice Roberts and Justice Kennedy (3 votes); Justices Thomas and Alito joined for one part (2 votes); while Justices, Breyer, Ginsburg, Kagan and Sotomayor (4 votes) joined for the remainder.
- Five justices ruled that EPA cannot require PSD or Title V permits from a source that exceeds threshold emissions only for GHGs and not for other pollutants. They found GHGs to be fundamentally different than the conventional pollutants already subject to these requirements, and found EPAâs scramble to justify much higher permit thresholds as evidence of this difference and the unsuitability of GHG-only regulation under these programs. This majority also ruled that the administrative agency (here, EPA), cannot tailor away statutory requirements enacted into CAA by Congress. (the other four justices would have approved the Tailoring Rule completely)
- Seven justices ruled that EPA can add GHG restrictions to PSD and Title V permits for sources subject to those programs âanywayâ because of their other emissions. These justices decided that adding some regulatory controls to the small numbers of large facilities already subject to permitting is a reasonable exercise of EPAâs CAA authority. They also added an un-quantified condition that GHG emissions must be âmore than de minimisâ to justify the additional burdens, and left EPA to establish appropriate thresholds. (the other two justices would have rejected coverage of âanywayâsources).
This fragmented decision allows EPA to add regulatory limits on GHG emissions to permits for the largest sources â the Supreme Court repeated EPAâs estimate that these âanywayâ sources represent fully 83% of all stationary source emissions of GHGs. It prohibits stand-alone regulation of a small number of other sources â the Supreme Court repeated EPAâs estimate that this group accounts for an additional 3% of emissions. And it appears to foreclose application of standard PSD and Title V thresholds to GHGs as separate pollutants.
So it appears that the surviving version of these EPA rules will be able to achieve further reductions in GHG emissions, but not to expand the universe of facilities with regulated GHG emissions. Of course, EPA has many other regulatory initiatives underwayâŚ
Does my organization have any facilities that are subject to regulation as major sources of any air pollutants, subject to PSD and Title V?
- If so, do any of those sources also emit CO2 and/or other GHGs?
- If so, do any of these facilitiesâ permits already include restrictions on CO2 and/or other GHGs?
- If so, have those emissions been quantified (for comparison against future de minimis thresholds EPA may establish)?
Where Can I Go For More Information?
â˘ Supreme Courtâs Utility Air Regulatory Group v. EPA decision
â˘ EPA Climate Change webpage, with extensive links to regulatory and scientific information
Jon ElliottÂ is President ofÂ Touchstone EnvironmentalÂ and hasÂ been a major contributor to STPâs product range for over 25 years. He was involved inÂ developingÂ 16 existingÂ products, includingÂ Environmental Compliance: A Simplified National GuideÂ andÂ The Complete Guide to Environmental Law. Specialty Technical Publishers (STP)Â provides a variety of single-law and multi-law services, intended to facilitate clientsâ understanding of and compliance with requirements. These include:
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