Environmental Alert
(By Varun Shekhar and Gina Falaschi)
On the final day of its 2021-2022 term, the United States Supreme Court released its 6-3 ruling in West Virginia v. EPA that narrows the EPA’s authority to regulate greenhouse gas emissions from power plants.
A coalition of states and power and coal companies led by West Virginia’s Attorney General Patrick Morrisey petitioned the Supreme Court to review a 2021 decision from the United States Court of Appeals for the District of Columbia Circuit (D.C. Circuit).[1] That decision struck down the Trump administration’s 2019 Affordable Clean Energy (ACE) rule, which had replaced the Obama administration’s 2015 Clean Power Plan. Specifically, the petitioners asked the Supreme Court to revisit the D.C. Circuit’s holding that EPA’s ACE rule, and simultaneous repeal of the Clean Power Plan, was based on a “mistaken reading of the Clean Air Act”—namely, that the “generation shifting” scheme employed by the Clean Power Plan cannot be a “system of emission reduction” under Section 111 of the Clean Air Act.
Under the Clean Power Plan, EPA calculated rate-based (amount of carbon dioxide emitted per megawatt hour generated) and mass-based (total amount of carbon dioxide emitted per year) targets for each state through application of three “building blocks” that were deemed to constitute the “best system of emission reduction…adequately demonstrated” (BSER). These “building blocks” include: (1) improvements to heat rates (a measure of heat input to power output efficiency) achieved at individual power generation facilities; (2) shifting power generation to natural gas-fired or combined cycle (NGCC) facilities; and (3) increased power generation from renewable and zero-emitting sources. The latter two “building blocks” constituted the Clean Power Plan’s “generation shifting” scheme, such that the EPA determined that the BSER included restructuring the nation’s overall mix of electricity generation, to transition from 38 percent from coal-fired sources to 27 percent from coal-fired sources by 2030. …