| Definition: | ability to supply the required total electric power and energy, without exceeding system component ratings or system operating limits, and with bus voltages and system frequency maintained within tolerances, taking into account planned outages and unplanned outages of the system components 
Figure 1 – Relationship between service reliability, system adequacy and system security Note 1 to entry: Adequacy can be quantified by measures given in Section 692-11 "Supply performance measures". Note 2 to entry: This entry was numbered 191-21-01 in IEC 60050-191:1990.
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