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| Plant & Energy Generation |
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The Erathna Small Hydropower Project is located in the Kuruwita Divisional Secretariat in the District of Ratnapura. The plant is 'run-of-the-river' and utilizes the water flow of the upper reaches of the Kuru Ganga, which originates at the Adams's Peak at an elevation of 2100 meters above mean sea level. The river leaves the boundary of the sanctuary at an elevation of 1030 meters and continues onward as a tributary of the Kalu Ganga.
The hydro plant infrastructure is sited on a total land extent of approximately 4.0 ha, spanning two villages; Pelendakanda and Adavikanda. The land extent covers the land trace from the weir through the headrace channel up to the forebay Tank, the penstock path, the powerhouse and the tailrace path. The powerhouse is located on the right bank of the river at Adavikanda and easily accessible by road.
The water catchment area of the plant is estimated to be 14.5 square kilometres in extent. The water diversion point and the weir are at an elevation of 840 meters above mean sea level. Diverted water flows through the intake and along a covered terrace channel to the forebank tank. It is then channelled down through a penstock to the powerhouse.
The generated power is fed through two primary transformers and transmitted though an 18 km long cable to the Kosgama-Ratnapura 33 kV line.
Currently the plant generates approximately 42 gWh of energy annually.
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