The Erathna Mini 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 Adam’s Peak at an elevation of 2,100 meters above the mean sea level. The river leaves the boundary of the sanctuary at an elevation of 1,030 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. The Powerhouse is located on the right bank of the river at Adavikanda and easily accessible by road. The water catchments area for 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 the mean sea level. The diverted water flows through the intake and along a covered Headrace channel to the Forebay tank.

It is then channelled down through a penstock of 2.4 kilo meters long to the Powerhouse, which is at an elevation of 377 meters. This provides a total energy head of 463 meters. Before reaching the Powerhouse, the Penstock bifurcates into two pipelines that feed twin Pelton turbines. The turbines drive the synchronous electric generators. The expended water is then released along the Tailrace channel to the Kuru Ganga.

The generated power is fed through two primary transformers and transmitted via an 18 km long interconnection line connecting to the Kosgama – Ratnapura 33 kV power line. The plant consists of turbine machinery manufactured by Voith Siemens, a reputed German producer of turbine machinery. The entire plant is operated, regulated and monitored from water intake to power generation by means of a computerized control system.

 
Monthly Power Generation
2010
2011
2012
2013
2014
2015
2016
2017
 
Units
kWh
Units
kWh
Units
kWh
Units
kWh
Units
kWh
Units
kWh
Units
kWh
Units
kWh
 January
962,454
2,116,386
547,367
1,337,701
1,295,000
1,315,781
1,318,647
651,507
 February
801,984
1,702,117
603,883
1,170,096
603,663
1,633,422
509,117
360,468
 March
742,945
1,767,098
594,229
1,604,287
1,188,840
1,063,026
709,720
1,082,097
 April
2,223,339
3,204,934
4,133,819
2,060,601
1,485,012
3,233,260
1,320,043
1,685,293
 May
5,448,931
4,551,339
2,300,033
6,133,238
2,954,389
4,556,864
5,713,867
4,164,133
 June
6,091,350
5,154,091
4,022,233
6,996,320
6,057,312
5,002,834
5,513,819
5,941,390
 July
5,648,764
4,301,210
4,489,680
6,590,531
5,204,665
5,217,084
4,008,243
4,082,126
 August
4,439,212
5,155,713
4,381,056
4,372,854
6,332,665
4,708,884
4,731,918
6,493,852
 September
4,642,867
4,860,252
4,700,705
4,942,559
5,166,610
5,914,167
3,667,695
5,695,122
 October
4,540,150
3,348,808
4,683,185
4,529,847
5,643,707
5,824,991
3,634,485
 
 November
4,822,453
3,037,618
4,384,431
3,195,240
3,235,940
4,384,063
3,806,554
 
 December
4,219,154
1,611,353
2,225,780
1,937,480
3,435,607
2,760,978
947,011
 
 Total
44,583,603
40,810,919
37,066,401
44,870,754
42,603,410
45,615,354
35,881,119
30,155,988
Project Highlights

The Erathna Mini 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 Adam’s Peak at an elevation of 2,100 meters above the mean sea level. The river leaves the boundary of the sanctuary at an elevation of 1,030 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. The Powerhouse is located on the right bank of the river at Adavikanda and easily accessible by road. The water catchments area for 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 the mean sea level. The diverted water flows through the intake and along a covered Headrace channel to the Forebay tank.  

It is then channelled down through a penstock of 2.4 kilo meters long to the Powerhouse, which is at an elevation of 377 meters. This provides a total energy head of 463 meters. Before reaching the Powerhouse, the Penstock bifurcates into two pipelines that feed twin Pelton turbines. The turbines drive the synchronous electric generators. The expended water is then released along the Tailrace channel to the Kuru Ganga.

The generated power is fed through two primary transformers and transmitted via an 18 km long interconnection line connecting to the Kosgama – Ratnapura 33 kV power line. The plant consists of turbine machinery manufactured by Voith Siemens, a reputed German producer of turbine machinery. The entire plant is operated, regulated and monitored from water intake to power generation by means of a computerized control system.

 
Monthly Power Generation
2010
2011
2012
2013
2014
2015
2016
2017
 
Units
kWh
Units
kWh
Units
kWh
Units
kWh
Units
kWh
Units
kWh
Units
kWh
Units
kWh
 January
962,454
2,116,386
547,367
1,337,701
1,295,000
1,315,781
1,318,647
651,507
 February
801,984
1,702,117
603,883
1,170,096
603,663
1,633,422
509,117
360,468
 March
742,945
1,767,098
594,229
1,604,287
1,188,840
1,063,026
709,720
1,082,097
 April
2,223,339
3,204,934
4,133,819
2,060,601
1,485,012
3,233,260
1,320,043
1,685,293
 May
5,448,931
4,551,339
2,300,033
6,133,238
2,954,389
4,556,864
5,713,867
4,164,133
 June
6,091,350
5,154,091
4,022,233
6,996,320
6,057,312
5,002,834
5,513,819
5,941,390
 July
5,648,764
4,301,210
4,489,680
6,590,531
5,204,665
5,217,084
4,008,243
4,082,126
 August
4,439,212
5,155,713
4,381,056
4,372,854
6,332,665
4,708,884
4,731,918
6,493,852
 September
4,642,867
4,860,252
4,700,705
4,942,559
5,166,610
5,914,167
3,667,695
5,695,122
 October
4,540,150
3,348,808
4,683,185
4,529,847
5,643,707
5,824,991
3,634,485
 
 November
4,822,453
3,037,618
4,384,431
3,195,240
3,235,940
4,384,063
3,806,554
 
 December
4,219,154
1,611,353
2,225,780
1,937,480
3,435,607
2,760,978
947,011
 
 Total
44,583,603
40,810,919
37,066,401
44,870,754
42,603,410
45,615,354
35,881,119
30,155,988
Project Highlights

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