Assessment of cost of Unserved Energy for Sri Lankan Industries

The cost of unserved energy is an important parameter in long term generation planning. Indices produced based on this value are used in a wide range of management decisions throughout the utility. The value of cost of unserved energy currently used by Ceylon Electricity Board (CEB) is based on studies conducted over a decade ago. It is important to update such estimates. The paper presents an analysis of data on electricity interruptions for different industry categories based on their contribution to the economy and losses caused by electricity interruptions is presented. This data was then used to calculate cost of energy unserved in the selected industry categories. Data was gathered through a survey based study conducted on a stratified sample to cover the full spectrum of industries. The work included design of the questionnaire, selection of the sample, conduct of the survey, analysis and conclusions. The study developed a satisfactory methodology for calculating the cost of unserved energy.