Clean Air Act § 303 Coming into the Limelight 

Smoke Stack

Part 1: Legislative History and a Recounting of § 303 Uses

By Johanna Adashek

The Clean Air Act contains what can be considered an “Emergency Provision” or a “Substantial Endangerment Provision” that provides EPA with the authority to unilaterally issue orders to polluters substantially endangering the public health, welfare, or the environment. This broad and versatile power, while not frequently used, has demonstrated the potential to combat ongoing or imminent hazards from further harming the public or the environment. This post will review the legislative history of § 303 beginning with the emergency provision in the Air Quality Act of 1967 to the Clean Air Act of 1970 and two subsequent Clean Air Act amendments. After detailing how Congress has strengthened the emergency provision in Clean Air Act § 303, this post will then recount EPA’s use of § 303 over the past half century.

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Understanding the Proposed New Clean Air Act § 111 Rule on Fossil Fuel-Fired Electric Generating Units

EGU and transmission line

By Johanna Adashek

On May 23, 2023, EPA proposed a new rule that would regulate fossil fuel-fired electric generating units (EGUs). The regulations reflect different regulatory requirements that EPA has crafted using its authority under the Clean Air Act (CAA) § 111, often referred to as New Source Performance Standards or NSPS. This blog post will provide a brief explanation of the NSPS as well as factual background on the kinds of fossil fuel-fired EGUs that are treated differently for purposes of this proposed rule. The post will then discuss the five components of the new rule in the following order: (1) the revised NSPS for greenhouse gas emissions from new fossil fuel-fired stationary combustion turbine EGUs; (2) the repeal of the Affordable Clean Energy Rule; (3) the emission guidelines for existing fossil fuel-fired steam generating units; (4) the emission guidelines for existing large and frequently used stationary combustion turbine EGUs; and (5) the solicitation of comments on regulating existing smaller and less frequently used fossil fuel-fired combustion turbines.

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