摘要：One of a power system’s subsystems is the generation subsystem consisting of power units, the reliability of which to a large extent determines the reliability of the power system and electricity supply to consumers.This paper presents definitions of the basic indices of power unit reliability used in Poland and in the world.They are compared and analysed on the basis of data published by the Energy Market Agency (Poland),NERC (North American Electric Reliability Corporation – USA),and WEC (World Energy Council).Deficiencies and the lack of a unified national system for collecting and processing electric power equipment unavailability data are also indicated.
