Loss-of-Load Expectation

LOLE. The number of days per year for which the available generation capacity is insufficient.

Definition by NERC

Source: ¹

Loss-of-Load Expectation (LOLE) is generally defined as the number of days per year for which the available generation capacity is insufficient to serve the demand at least once during that day. This metric is not being reported as part of this assessment. A criterion of one day in 10 years is an often used standard for LOLE.

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Last modified: 2025-06-20

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1. NERC (2013). Probabilistic Assessment - Addendum to the 2012 Long-Term Reliability Assessment. https://www.nerc.com/comm/PC/PAWG%20DL/NERC_2012_Probabilistic_Assessment_Final.pdf ↩