As the society gets more dependent on continuous electricity supply, the impacts of disruptions in the service yield significant economic losses for all customer segments. There is crucial need for understanding the worth of reliability improvements in the power systems for planning purposes of the transmission and distribution systems. That is why, there has been an increased attention by the researchers in the field of economic worth of electricity service reliability. This review summarizes the academic work done in the fields of worth of electric power reliability and customer interruption costs assessment techniques from the year 1990 to 2015
