This paper presents the results of an investigation of the direct short-term impacts and costs incurred by industrial, commercial and residential customers resulting from local random supply interruptions. The study used a direct survey in The Southern Power Corporation of the Electricity of Vietnam (EVNSPC) to determine the customer assessment of electric service interruptions to analyze interruption costs. The variation in interruption cost with the characteristics of interruptions, such as duration, time of day, week of year, advanced warning and reliability history, and with the characteristics of the users was also investigated. These results of surveys and interruption costs of customers are included in the paper.
