As of October 25, 2024, the Midcontinent Independent System Operator (MISO) and the Tennessee Valley Authority (TVA) will be able to send “emergency energy” to each other under an unprecedented agreement filed at FERC on October 24. [1] Because of TVA Act restrictions, the TVA is unable to supply emergency energy directly to MISO. The restrictions limit exports only to neighboring electric systems that the agency had power arrangements with as of July 1957. As a result, MISO members Ameren and Entergy will be able to buy electricity from the TVA during emergencies on behalf of MISO, since they meet the requirements of the TVA Act. During Winter Storm Elliot in December 2022, about 7,000 MW flowed to TVA’s region from MISO, according to FERC and NERC. The TVA instituted 8 hours of rolling blackouts at their peak during the winter storm. The agreement makes it so emergency energy can only be requested when an Energy Emergency Alert Level 2 or higher has been declared. The agreement is similar to those that MISO has with other balancing authorities.

[1] https://elibrary.ferc.gov/eLibrary/filelist?accession_number=20241024-5041&optimized=false