Environmental Defense v. Duke Energy Corp., 549 U.S. 561 (2007)
The case of Environmental Defense v. Duke Energy Corp.
Does the Clean Air Act's PSD program require a permit for modifications to a plant that results in increased total annual emissions, even if there is no increase in the maximum hourly emissions rate?
A 'modification' under the Clean Air Act's Prevention of Significant Deterioration program is defined as any physical change in, or change in the method of operation of, a stationary source that increases the amount of any pollutant emitted. The EPA interprets this as changes that lead to an increase in total annual emissions, regardless of changes to hourly emissions rates.
The Supreme Court held that the Clean Air Act does require a permit for modifications that result in an increase in total annual emissions, independent of whether the change affects the maximum hourly emissions rate.
This case is significant for law students as it illustrates the complexities of statutory interpretation and administrative law, particularly how courts review agency interpretations of statutes. The Supreme Court's decision also underlines the importance of comprehensive environmental regulation and the balance of interests between industry and environmental protection. It showcases the legal challenges inherent in applying environmental statutes to technological and industrial developments, providing vital insights into how regulatory agencies can set and enforce policies.