Assessment of Cost of Unserved Energy for Sri Lankan Commercial Sector

The investments for the improvements of power system to fulfill the energy requirements of electricity customers need to meet the reliability improvement targets. Thus, it is essential to obtain a clear and accurate assessment of Cost of Unserved Energy as an input to the power system planning process. Sri Lanka is currently using an approximated value of Cost of Unserved Energy calculated in 2002 considering only the Industrial Sector. It is important to update this value. This research was conducted to assess the Cost of Unserved Energy based on consumer survey method. The survey and analysis parts are conducted in three separate categories as Industrial, Commercial and Residential. This paper presents the results for Commercial sector, separately for momentary, planned and unplanned non-momentary interruptions. It is expected that the results of this study helps the power sector to provide a better service, taking the views of the customers and the national importance of electricity as an esential input for economic growth.