Tehri Hydro Power Complex (2400 MW)
Tehri Hydro Power Complex (HPC) is a multipurpose hydro power complex developed by THDC India Limited (THDCIL) on the Bhagirathi River in Uttarakhand. With a total installed capacity of 2,400 MW, the complex comprises Tehri HPP (1,000 MW), Koteshwar HEP (400 MW) and Tehri Pumped Storage Plant (1,000 MW). The complex supports peak power generation, irrigation and drinking-water requirements of the region and contributes significantly to grid balancing and renewable energy integration.
Tehri Hydro Power Plant (1000MW)
Tehri Hydro Power Plant (HPP) is a storage-based hydropower project comprising a 260.5 m high earth and rockfill dam across the River Bhagirathi and an underground powerhouse equipped with four 250 MW Francis turbine-generator units. Commissioned during 2006–07, Tehri HPP provides valuable peaking power to the Northern region of the country and supports the irrigation and drinking-water requirements in the region. The reservoir has also contributed to flood moderation during periods of heavy rainfall.
SALIENT FEATURES
| Nature of Scheme: | Storage scheme |
| Hydrology |
| Normal Annual Rainfall | 1016 to 2630 mm. |
| Maximum recorded flood discharge | 3800 Cumecs |
| Adopted maximum flood for diversion during monsoon period | 8120 Cumecs |
| Probable maximum flood | 15540 Cumecs |
| Routed Flood | 13040Cumecs |
| Reservoir |
| Full Reservoir Level (FRL) | EL 830 m. |
| Maximum Level during design flood (MFL) | EL 835 m |
| Dead Storage Level | EL 740 m. |
| Gross Storage | 3540 MCM |
| Dead Storage | 925 MCM |
| Live Storage | 2615 MCM |
| Water Spread at full Reservoir Level EL.830 m. | 44 Sq.km. |
| Water Spread at dead Storage Level EL.740 m. | 18 Sq.km. |
TECHNICAL FEATURES
| Diversion Tunnels |
| Type | Horse shoe |
| Left Bank | 2 Nos. 11.0m dia, 1774 &1778 m long |
| Right Bank | 2 Nos. 11.0m dia, 1298 &1429 m long |
| Diversion Flood Discharge | 8120 Cumecs |
| Dam |
| Type | Earth and Rock fill dam |
| Top Level | EL 839.5 m |
| Height | 260.5 m |
| Width at riverbed | 1125 m |
| Width at top | 25.5 m flared to 30.5 m at abutments |
| Length at Top | 575m |
| Slope |
| Upstream | 1: 2.5 |
| Downstream | 1: 2 |
| Spillways |
| Chute Spillway: | |
| Crest Level | EL 815.0 m |
| Waterway | 3 bays of 10.5 m width |
| Design Discharge | 5500 Cumecs |
| Type & No. of Gates | Radial Gates, 3 Nos |
| Right Bank Shaft Spillway: | |
| Type | Ungated 2 Nos |
| Crest Level | EL 830.2 m |
| Dia of Shaft | 12.0 m |
| Design Discharge | 3850 Cumecs |
| Left Bank Shaft Spillway: | |
| Type | Gated 2 Nos |
| Crest Level | EL 815.0 m |
| Dia of Shaft | 12.0 m |
| Design Discharge | 3650 Cumecs |
| Type of Gates | Radial gates |
| Intermediate Level Outlet: | |
| No. and size | One; 8.5 m dia |
| Discharge capacity ( at EL. 830.0 m) | 1100 Cumecs |
| Intake Works: | |
| Location | Left Bank of river Bhagirathi |
| No & Type of Structure | 2 Nos. Submerged Structure |
| Crest Elevation | EL 720 m. |
| Head Race Tunnels: | |
| Size and Number | 8.5m. dia, 2 Nos, |
| Total Length | 1634 m |
| Penstocks: | |
| Number and Size | 4 Nos., 5.75 m. dia each |
| Total Length | 1040 m |
| Power House |
| Machine Hall: | |
| Type | Underground |
| Location | Left Bank, under ground |
| Number & Units | 4 Nos, 250 MW each |
| Size | 197 m long, 22.0 m wide, 47.2m. high |
| Head | Maximum 231.5 m ,
Minimum127.50 m ,
Design 188.0 m. |
| Transformer Hall: | |
| Type | Underground |
| Size | 161m.longX 18.5m.wide X 29.0m high |
| Step-up Transformers: | |
| Capacity | 306 MVA |
| Number | 4 |
| Voltage Ratio | 15.7/400 KV |
| Switchyard: | |
| Location and Type | Indoor SF-6 Switchgear |
| Tail Race Works: | |
| Number and size of tail race tunnels | 2 Nos. , 9.0 m. dia each |
| Length of Tunnels | 862.5 m & 747.5 m |
| Invert Level of TRT Outlet | EL. 603.0 m. |
| Installed Capacity : | 1000 MW (4x250 MW) |
| Benefits from the Tehri Hydro Power Complex |
· Addition to the installed generating capacity in the Northern Region;
(1000 MW on completion of Tehri Stage-I); | 2400 MW |
- Annual energy availability (Peaking)
(2797 MU on completion of Tehri Stage-I)
| 5220 MU |
| 2.70 Lac.ha. |
- Stabilisation of existing irrigation
(besides above)
| 6.04 Lac.ha. |
- Additional Generation in downstream Projects
| 200 MU |
- 300 Cusecs (162 million gallons per day) of drinking water for Delhi which will meet the requirements of about 40 lac people.
|
- In addition, 200 Cusecs (108 million gallons per day) of drinking water for towns and villages of U.P. which will meet the requirement of 30 Lac people.
|
|
| · Integrated development of Garhwal region, including construction of a new hill station town with provision of all civic facilities; improved communication, education, health, tourism, development of horticultures, fisheries, and afforestation of the region. |
| S.No. | Description | Generation (MU) |
|---|
| 1 | Generation during July 2026 | 191.07 |
| 2 | Cumulative Generation during FY 2026-27 (up to July 2026) | 595.68 |
Last Updated on 18/8/2026
