The Tehri Dam is a rock and earth-fill embankment dam on the Bhagirathi River near Tehri in Uttarakhand, India. At a depth of around 800 ft, the dam is the highest in the country and distributes 270 million gallons of drinking water per day, irrigates thousands of acres of farmland and generates electricity to Uttar Pradesh, Delhi and other areas.
The 1,000 MW Tehri Pumped Storage Project (PSP) forms part of the 2,400 MW Tehri Hydro Power Complex being developed by THDC India, a joint venture of the Indian Government and the State Government of Uttar Pradesh. Made up of four reversible pump turbine units of 250MW each on the left bank of the Bhagirathi River, its operation is based on the concept of recycling water discharged between upper and lower reservoirs.
SMEC has been working on the project since 2013, addressing design issues encountered by another consultant and proposing alternate and ultimately successful first-of-their-kind designs.
For example, to address geological constraints, a team of global experts in hydropower, tunnelling, and dams designed a surge shaft chamber with the surge shaft slanting inward, in inverted form. This is the first time such a solution has been adopted in India, and potentially worldwide.
While the design solutions will help the project meet its deadlines and technical expectations, our digitally enabled approach also enhanced safety on the project. In particular, the complex 3D analysis done on the underground caverns ensured the safety of all involved during excavation and operation. Rock bolting was modelled for each round of excavation, replicating the actual underground conditions. As a result, and despite poor geological conditions, two caverns have already been excavated whilst ae third is under construction and more than 50% complete.
Collaborating with the surrounding communities on the project has led to many new job opportunities and associated development for the cities around the project location. Once complete, the Tehri Pumped Storage Project will further support the development of neighbouring areas, providing more reliable power supply that will boost employment and revenue.
- Uttarakhand, India
- Technical Area:
- HCC Ltd, THDC Ltd