It was the first time in Huntsville Utilities’ history that it resorted to rolling blackouts that came at the behest of Tennessee Valley Authority to protect the electrical grid from overloading and shutting down.
Kelley addressed the city council to report on how the utility handled the record demand on its power system when wind-chill temperatures dropped below zero degrees.
Kelley said Huntsville Utilities had no choice but to implement the rolling blackouts after TVA put out the call for load reduction. “We did not get to that,” he said. “And that is to avoid a worst-case scenario, which happen past Step 60, where TVA loses control of the grid and it just starts shutting itself off. So all of this is actually a sign of success. The system worked as intended but it is a blunt tool.”
Huntsville Utilities had record electricity demands on the mornings of both Dec. 23 and Dec. 24, Kelley said. System-wide, TVA said it supplied more power on Dec. 23 than at any other time in its 90-year history. “When the weather got to them, they stopped that transmission of power to TVA. completely normal, this is not a disastrous thing. And then TVA was short, and so thus the need to implement interruptions. So again, they had a loss of a power plant – understandable, that happens. Some generation wasn’t available and then the importing of power was constrained due to transmission operations.”for the need for rolling blackouts. The federally-owned utility said it is reviewing the situation.
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