Definition: | quotient of the energy not supplied by an electric power system during a given incident, by the annual peak load
NOTE – If the energy not supplied is expressed in megawatt-minutes and the annual peak load in megawatts, this index is often referred to in English as “system-minutes”. One minute of this quantity is equivalent, in energy, to an interruption of the total system load for one minute at the time when the annual system peak load occurs.
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