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Loss-of-Load Probability

The probability that system demand will exceed generating capacity during a given period.

Definition by NERC

Source: 1

Loss-of-Load Probability (LOLP) is the probability of system demand exceeding the generating capacity during a given period. If LOLP is the number of days on which there is expected to be a shortfall per year, it is the same as LOLE. However, other definitions of LOLP are also used.

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 ↩