The Midcontinent Independent System Operator (MISO) and the Tennessee Valley Authority (TVA) have forged an unprecedented pact, allowing the exchange of “emergency energy” between the two entities, a development officially documented in a filing with the Federal Energy Regulatory Commission (FERC) on Thursday.
However, notable complexities arise from existing legal constraints within the TVA Act. This act hinders the TVA from directly supplying emergency energy to MISO due to longstanding limitations, which only permit exports to neighboring electric systems with established power exchange agreements dated before July 1957.
In light of these constraints, the newly minted agreement empowers Ameren and Entergy—both MISO members complying with TVA Act requirements—to procure electricity from the TVA. This arrangement will come into play during critical energy emergencies, thus enabling MISO to effectively mitigate potential power deficiencies.
MISO emphasized the urgent need for this collaboration, particularly in response to the evolving dynamics of the electrical grid and recent adversities, such as the catastrophic Winter Storm Elliott. The operator articulated, “Recent extreme weather events and the changing grid landscape have underscored the necessity for enhanced coordination and planning to safeguard reliability during emergencies.” The interplay of MISO and TVA’s procurement strategies aims to bolster the reliability of their respective transmission systems and, ultimately, protect the integrity of the vast Eastern Interconnection.
Recalling the harrowing circumstances brought on by Winter Storm Elliott in December 2022, approximately 7,000 MW surged from MISO into TVA’s infrastructure as the storm wreaked havoc. During this crisis, TVA undertook sweeping measures, enacting nearly eight hours of rolling blackouts that peaked at an alarming 3,000 MW.
Under the accord, the invocation of emergency energy is strictly confined to scenarios where an Energy Emergency Alert Level 2 or higher is officially announced. This approach mirrors similar agreements MISO holds with other grid balancing authorities, marking a strategic alignment in operational response.
“Emergency Energy is reserved for the direst situations where grid reliability hangs in the balance, and options are rapidly dwindling,” MISO articulated. Both MISO and TVA are bracing for potential future scenarios that may test this threshold, knowing that the ability to transact emergency energy could very well be the linchpin for enhanced grid stability and preventing power outages.
In light of these developments, MISO has formally requested FERC to endorse the agreement, seeking an activation date set for December 24.