Table 1: Key statistics
Installed capacity |
690MW |
Annual electricity production |
Approx. 4600GWh |
Turbines |
6 Francis vertical axis |
Rated discharge per unit |
24m3/sec |
Rated output per unit |
115MW |
Hlsln reservoir area |
57km2 |
Hlsln reservoir length |
25km |
Hlsln reservoir live storage |
2100Mm3 |
Hlsln full supply level (FSL) |
625m a.s.l. |
Hlsln minimum operating level |
575m a.s.l. |
Hlsln catchment area |
1806km2 |
Average inflow to Hlsln |
107m3/sec |
Krahnjkar dam maximum height |
193m |
Krahnjkar dam length |
730m |
Krahnjkar fill materials |
8.5Mm3 |
Desjarr dam maximum height |
60m |
Desjarr dam length |
1100m |
Desjarr fill materials |
2.8Mm3 |
Saudrdals dam maximum height |
25m |
Saudrdals dam length |
1100m |
Saudrdals fill materials |
1.5Mm3 |
Ufsarln reservoir area |
1km2 |
Ufsarln maximum water level |
625m a.s.l. |
Ufsarln pond catchment area |
430km2 |
Average inflow to Ufsarln |
31m3/sec |
Ufsar dam maximum height |
37m |
Ufsar dam length |
620m |
Ufsar fill materials |
0.6Mm3 |
Keldurln reservoir area |
7.5km2 |
Keldurln FSL |
669m a.s.l. |
Keldurln live storage level |
60Mm3 |
Keldur dam maximum height |
26m |
Keldur dam length |
1650m |
Keldur fill materials |
0.8Mm3 |
Tunnels |
Approx. 72km |
Headrace from Hlsln (dia: 7.27.6m) |
39.7km |
Headrace from Ufsarln (dia: 6.5m) |
13.3km |
3 adits to headrace (dia: 7.27.6m) |
6.9km |
2 diversion tunnels and adit at dam |
2.4km |
Grouting galleries at dam |
0.5km |
Surge tunnel (dia: 4.5m) |
1.7km |
2 diversion tunnels Hraunaveita (dia: 4.5m) |
3.7km |
2 vertical pressure tunnels (dia: 4.0m) |
0.8km |
Access tunnel to power station (dia: 7.5m) |
1.0km |
Tailrace tunnel (dia: 9.0m) |
1.3km |
Cable tunnel (dia: 4.0m) |
1.0km |
Total head |
599m |
Maximum rated discharge |
144m3/sec |
Average discharge |
110m3/sec |