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Sri Lanka experienced an island-wide power outage due to a failure in the transmission system at the Kerawalapitiya Grid-Substation which last long for more than 5 hr for some areas of the country. That has affected the operation of pump houses resulting in the low-pressure supply of water. The quality of the electricity supply in Sri Lanka improved significantly after the end of war and country world ranking toped to 54th place in 2013. Thereafter the quality value which ranged from 1 to 7, has fallen continuously except 2016, the resulting country to fell down to 96th place. Meanwhile, pear country Vietnam has gradually improved the index value as well as rank.