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Melissa Horne

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Melissa helps industrial and utility clients understand and navigate complex environmental requirements, with a focus on real-world implications for their business. She focuses her practice heavily on Clean Air Act and climate change issues, and advises clients on environmental justice and ESG matters.

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On the last day of what was already an historic term, the Supreme Court issued another significant decision impacting EPA’s authority under the Clean Air Act to regulate greenhouse gas emissions and address climate change. As EPA embarks on a third attempt at a rule targeting CO2 emissions from existing power plants that will pass legal muster, the question now is how the Court’s decision will affect that new rule.
Continue Reading West Virginia v. EPA: The Supreme Court Speaks Again on Climate

The Securities and Exchange Commission (SEC or Commission) published proposed rules on March 21 that, for the first time, would codify the Commission’s expectations regarding what kinds of climate-related disclosures public companies must make in their required filings to the SEC. Prior to now, companies have had to rely on 2010 guidance from the Commission to determine what information they should disclose to investors regarding their climate-related risks.
Continue Reading SEC Publishes Proposed Rule Requiring Climate Disclosures

In a proposed rule signed on February 28, but not yet published in the Federal Register, EPA proposed to significantly expand its current approach to regulating the interstate transport of ozone. Under the so-called “good neighbor” provision of the Clean Air Act, states are required to submit State Implementation Plans (SIPs) to EPA containing rules sufficient to prohibit emissions from their state that would either significantly contribute to another state’s nonattainment of national ambient air quality standards or interfere with another state’s maintenance of those standards. If a state submits a SIP that is insufficient to satisfy its good neighbor obligation, EPA must issue a Federal Implementation Plan (FIP) to fully address the problem.
Continue Reading EPA Proposes Significant Expansion to Interstate Ozone Transport Regulations

To help reboot after the holiday break, here is a list of air topics we expect to make news in 2022 with a short discussion of why each one may be important to you.
Continue Reading Welcome Back! These Are the Air Topics That Will Make News in 2022

In a final rule published in the Federal Register on November 24, the Environmental Protection Agency (EPA) quietly finalized a hotly contested proposed rule, adding natural gas processing facilities to the list of industry sectors required to report their releases of certain chemicals under Section 313 of the Emergency Planning and Community Right-to-Know Act (EPCRA), also known as the Toxic Release Inventory (TRI). Facilities must report releases and waste management of specifically listed chemicals to the TRI if they: (1) have 10 or more full-time employees, (2) have a primary Standard Industrial Classification (SIC) or North American Industry Classification System (NAICS) code listed in the regulations, and (3) manufacture, process, or otherwise use certain listed chemicals in the course of a calendar year in quantities exceeding identified thresholds.
Continue Reading Natural Gas Processors to Report to EPA’s Toxic Release Inventory Beginning 2023

Earlier this week, EPA published its proposed new methane regulations for the oil and gas sector. These new rules will have significant practical implications for the industry and have the potential to set new precedent for EPA’s authority under the Clean Air Act to address climate change for other industries as well. While the proposal is over 150 pages long, it does not include the actual text of the proposed rules, promising instead to provide proposed text in a supplemental notice early next year.
Continue Reading EPA Issues Highly Anticipated Methane Rule for the Oil and Gas Sector

The U.S. Supreme Court has elected to hear a legal dispute over the scope of the authority granted to the Environmental Protection Agency (EPA) under the Clean Air Act to regulate greenhouse gas (GHG) emissions from existing power plants. In orders issued October 29, the Court granted certiorari to four petitioners — West Virginia, North Dakota, the North American Coal Corporation, and Westmoreland Mining Holdings LLC — seeking reversal of a September 2020 D.C. Circuit Court of Appeals decision striking down the Affordable Clean Energy (ACE) rule.
Continue Reading Supreme Court Will Hear Controversy Over EPA Regulation of Greenhouse Gases from Existing Power Plants

The Biden EPA just did something unexpected — it decided to keep a Trump EPA rule, at least for the time being. The rule, known as “project emissions accounting” under the “New Source Review” (NSR) air permitting program, allows sources of air emissions to avoid permitting by using emission decreases to offset an increase that would otherwise need a permit. While largely procedural in nature, EPA’s decision to keep the rule is notable for a few reasons.
Continue Reading Biden EPA Decides to Keep a Trump EPA NSR Rule … For Now

At the end of September, the Environmental Protection Agency (EPA) issued yet another memorandum regarding emissions resulting from startup, shutdown, and malfunctions (SSM) at stationary sources of air pollutants, such as refineries, manufacturing facilities, and power plants. This newest memo announces a return to the policy EPA announced in 2015, when it asked 45 states and local jurisdictions to change their locally written and previously EPA-approved rules. EPA’s goal in 2015 was to eliminate state rules that allow relief from penalties for “SSM” emissions. In 2020, the Trump EPA issued a memo allowing such rules under certain circumstances, but the newest EPA memo puts those rules back on the chopping block. This post provides a brief recap of the long-running debate over SSM emissions and a look forward into what is to come under EPA’s latest policy shift.
Continue Reading Penalizing Unavoidable Air Emissions: The Fight Over SSM Continues

In their article “Are We There Yet? The Challenges of Litigating Clean Air Act Rules,” Mack McGuffey and Melissa Horne discuss the difficulties of getting final answers from the courts in the increasingly polarized political environment of Clean Air Act rulemaking.
Continue Reading Troutman Pepper Environmental Attorneys Author Articles in ABA’s Natural Resources & Environment Summer 2021 Edition