112 list. Thereafter it promulgated CAMR under section 111. EPA’s removal of these EGUs from the section 112 list violates the CAA because
section 112(c)(9) requires EPA to make specific findings before removing a source listed under section 112; EPA concedes it never made such
findings. Because coal-fired EGUs are listed sources under section 112, regulation of existing coal-fired EGUs’ mercury emissions under section
111 is prohibited, effectively invalidating CAMR’s regulatory approach. Accordingly, the court grants the petitions and vacates both rules.
I.
In 1970, Congress added section 112 to the CAA. Pub.L. No. 91-604, § 4(a), 84 Stat. 1676, 1685 (1970). In its original form, section 112 required
reduction in emissions which can be achieved by application of [the] best available control technology,” S.REP. NO. 101-228, at 133, reprinted
in 1990 U.S.C.C.A.N. at 3518; see, e.g., CAA § 112(g)(2)(A), Congress imposed specific, strict pollution control requirements on both new and
existing sources of HAPs. Congress specified that new sources must adopt at minimum “the emission control that is achieved in practice by
the best controlled similar source, as determined by the Administrator.” Id. § 112(d)(3). Existing sources (with certain exceptions) must adopt
emission controls equal to the “average emission limitation achieved by the best performing 12 percent of the existing sources.” Id. §
[t]he Administrator shall perform a study of the hazards to public health reasonably anticipated to occur as a result of emissions by [EGUs]
of pollutants listed under subsection (b) of this section after imposition of the requirements of this chapter. The Administrator shall report
the results of this study to the Congress within 3 years after November 15, 1990. The Administrator shall develop and describe in the
Administrator’s report to Congress alternative control strategies for emissions which may warrant regulation under this section. The
Administrator shall regulate [EGUs] under this section, if the Administrator finds such regulation is appropriate and necessary after
Steam Generating Units, 65 Fed.Reg. 79,825, 79,827 (Dec. 20, 2000) (“2000 Determination”). “As a result the source category for Coal– and Oil-
Fired [EGUs] was added to the list of source categories under section 112(c)” on December 20, 2000. National Emission Standards for
Hazardous Air Pollutants: Revision of Source Category List Under Section 112 of the Clean Air Act (“2002 Notice of Listing”), 67 Fed.Reg. 6521,
6522, 6524 (Feb. 12, 2002).
In early 2004, EPA proposed two regulatory alternatives to control emissions from coal- and oil-fired EGUs. The first was similar to EPA’s