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national security interests to ensure that this base has reliable power delivery. Clearly: maintaining the supply of reliable. affordable energy in South Dakota and across the country is crucial to national security. V. Conclusion Otter Tail and the Co-owners appreciate the opportunity to present reasons for which the Big Stone Plant should be exempt from MATS RTR compliance requirements for a two-year period. We respectfully request your consideration and are happy to answer any questions. Respectfully submitted, Bradley E. Tollerson Vice-President, Energy Supply Otter Tail Power Company Designated Representative, Big Stone Plant 8 Sierra Club FOIA 2025-EPA-04883 ED_018388_00000190-00008 SC_EVERSPLIT0005963