Spinning Reserve

Spinning reserve is any back-up energy production capacity that can be made available to a transmission system within a few minutes’ notice and can operate continuously for at least two hours once it is brought online. Spinning reserve (SR) allows system operators to compensate for unpredictable imbalances between load and generation caused by sudden outages of generating units, errors in load forecasting or unexpected deviations by generating units from their production schedules.

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