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By Isa Cordon, Environmental Intern
The withdrawal of EPA’s 2023 Affirmative Defense Rule restores an important compliance protection for power plants and other industrial facilities. While the change reopens a valuable avenue for mitigating enforcement risk associated with unavoidable excess emissions events, it does not lessen the expectation of continuous compliance. Instead, it reinforces the need for rigorous operational controls, accurate monitoring, and comprehensive documentation.
Affirmative Defense allows a facility to seek relief from potential penalties when an emissions exceedance results from a sudden, unavoidable, and unforeseeable emergency that is promptly corrected and reported. However, the defense does not eliminate the violation itself. Instead, it provides a mechanism for demonstrating that penalties should not apply due to circumstances beyond the facility’s control.
For the power generation sector, the significance of this change is substantial. Power plant operations routinely include events such as startup and shutdown activities, forced outages, and equipment malfunctions that challenge emission control systems despite prudent operation and maintenance practices. These events highlight the disconnect between the Clean Air Act’s expectation of continuous compliance and the technical and operational realities of running a power plant. Although the restoration of Affirmative Defense provides facilities with flexible options when responding to unavoidable emissions events, the legal standard of continuous compliance remains in full force. Deviations from permit requirements at any time must be supported by credible, defensible evidence.
Effective use of Affirmative Defense depends on robust records, including detailed operational logs, accurate emissions-monitoring data, maintenance histories, event reports, and corrective action documentation. This type of high-quality evidence is critical for demonstrating that an exceedance resulted from an unavoidable circumstance rather than operator error or inadequate maintenance.
For CAMS, complete and defensible recordkeeping helps reduce compliance risk while supporting reliable operations, stronger environmental performance, and better-informed operating decisions across our fleet. CAMS’s Operations Procedure OPO-002, “Environment over Production,” states that, “Compliance with Environmental Law takes precedence over Production at CAMS. CAMS is committed to operating in an environmentally responsible manner and in compliance with all applicable environmental requirements.” Affirmative Defense is not a substitute for permit compliance, but when paired with operational excellence and comprehensive documentation, it can serve as a safeguard for both environmental stewardship and reliable operations. The withdrawal of EPA’s 2023 Affirmative Defense Rule restores an important compliance protection for power plants and other industrial facilities. While the change reopens a valuable avenue for mitigating enforcement risk associated with unavoidable excess emissions events, it does not lessen the expectation of continuous compliance. Instead, it reinforces the need for rigorous operational controls, accurate monitoring, and comprehensive documentation.