SUBANSIRI (LOWER)
Subansiri Lower HE Project is the biggest hydroelectric project undertaken in India so far and is a Run of River scheme with small Pondage on river Subansiri. The Project is located near North Lakhimpur on the border of Arunachal Pradesh and Assam. The nearest railhead is Nagaon and nearest airport is Lilabari / Dibrugarh. The estimated annual energy generation from the Project is 7421.59 MU in a 90% dependable year.
| Feature Name | Description |
|---|---|
| Location | Located in Lower Subansiri in Arunachal Pradesh and Assam |
| Approach | Nearest Rail Head is Nagaon& Nearest Airport is Lilabari / Dibrugarh |
| Capacity | 2000 MW (8x250 MW) |
| Design Energy | 7421.59 MU ( 90% dependable year) |
| Date of Commercial Operation (COD) | Project is likely to be completed in MAY 2026 |
| Project Cost | Rs.6285.33 Crores (December 2002 Price Level) Now Anticipated: Rs. 21247.54 Crores (at Completion cost) Level) |
- A concrete gravity dam 116 m high from river bed level.
- Head Race Tunnel - 8 Nos., 9.5m dia, horse shoe shaped, 7102m total length.
- Surge Tunnels - 8 Nos., 9.5 m dia., horse shoe shaped 3545m total length.
- Pressure Shaft- 8Nos., Circular, 9.5/8/7m dia, length 192m to 215m, 8 Nos., Vertical pressure shafts - each 48m deep..
- Surface power house to accommodate 8 units of Francis turbines of 250 MW capacity each.
- Tail race channel, 206 m x 35 m (W x L)