Warask Hydroelectric Power Project was completed under Colombo Plan in two phases, financed by Canadian Government. The first phase was completed in 1960 at a total cost of Rs.394.98 million, consisting of construction of Dam, Irrigation tunnels, civil works four Generating Unit for capacity of 40 MW each and 132 K.V transmission system.
In 2nd Phase, Two additional generating units each of 41.48 MW were added in 1980-81 at a cost of Rs.106.25 Million.
In general the Project consists of a mass concrete gravity Dam with integral spillway, Power tunnel, Power Station, a concrete lined 10 feet diameter Irrigation on right bank and a 3 feet diameter steel pipe Irrigation conduit on the left bank of the reservoir. The 250 feet high and 460 feet long dam with reservoir of 4 square miles as a live storage capacity of 25,300-acre feet of water for irrigation of 119,000 acres of land and meeting power generation requirement. A spillway with 9 gates is capable to discharge 540,000 cosecs of flood. The Project is plying a vital role in the development of the country by providing cheap power to the National Grid. The Project has delivered 38629.512 million units to the power system unto August 2011 since commissioning.