LOLE. The number of days per year for which the available generation capacity is insufficient.
Loss-of-Load Expectation (LOLE)
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.
Loss-of-Load Probability (LOLP)
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.
Loss-of-load events (LOLEV)
Loss-of-Load Events (LOLEV) is the number of events in which some system load is not served in a given year. A LOLEV can last for one hour or for several contiguous hours and can involve the loss of one or several hundred megawatts of load. TRE-ERCOT is the only Assessment Area to provide this metric in its regional assessment.