Loss of load in an electrical grid is a term used to describe the situation when the available generation capacity is less than the system load.
[1] Multiple probabilistic reliability indices for the generation systems are using loss of load in their definitions, with the more popular[2] being Loss of Load Probability (LOLP) that characterizes a probability of a loss of load occurring within a year.
Multiple reliability indices for the electrical generation are based on the loss of load being observed/calculated over a long interval (one or multiple years) in relatively small increments (an hour or a day).
The total number of increments inside the long interval is designated as
In the US, the threshold is set by the regional entities, like Northeast Power Coordinating Council:[11] resources will be planned in such a manner that ... the probability of disconnecting non-interruptible customers will be no more than once in ten yearsThis electricity-related article is a stub.