Overview
The Velimalai Pumped Storage Hydro Electric Project is a 1,100 MW power plant planned in Kanniyakumari district, Tamil Nadu. It recently received Terms of Reference (ToR) clearance from the Union Ministry of Environment, Forest and Climate Change. This is Tamil Nadu’s first such project under a public-private partnership model. It will help manage peak electricity demand and support renewable energy.
Latest News: ToR Clearance Granted
Good news came for Tamil Nadu’s energy sector. The Union Ministry of Environment, Forest and Climate Change recently gave Terms of Reference (ToR) clearance to the Velimalai Pumped Storage Hydroelectric Project. This clearance is an early but important step. It means the project can now prepare detailed environmental studies. The 1,100 MW plant will come up in Kanniyakumari district.
Where Is the Project Located?
The project is located at Vellimalai in the Kanyakumari district of Tamil Nadu. This is the southernmost part of India. The area has hills and small water bodies, which are suitable for pumped storage projects.
What Is the Installed Capacity?
The project has an installed capacity of 1,100 MW. It will have an underground powerhouse with four units. Each unit will produce 275 MW. Together, they add up to 1,100 MW.
A First for Tamil Nadu: Public-Private Partnership
This is the first project in Tamil Nadu to be developed under the public-private partnership (PPP) model. The model is called build-own-operate-transfer (BOOT). This is done in accordance with Section 63 of the Electricity Act. In simple words, a private company will build, own, and run the plant. Later, it will be transferred to the government. This brings private efficiency to public energy needs.
Closed-Loop Off-River System: What Does It Mean?
The project is planned as a closed-loop off-river system. This is a smart and environment-friendly design. Let us understand:
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Closed-loop means water does not come from a river continuously. Instead, the same water moves between two reservoirs again and again.
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Off-river means the reservoirs are not built on a perennial river or stream. They are created away from natural flowing rivers.
This design has a big benefit. It does not disturb the natural flow of rivers. It also avoids displacing many people or harming river ecosystems.
The Two New Reservoirs
The project will build two new off-river reservoirs:
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Upper Reservoir
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Lower Reservoir
Both reservoirs are artificial. They will not take water from perennial rivers. Water will simply circulate between them in a controlled cycle. There is very little need for natural inflows.
How Does the Pumped Storage Work?
The working of this project is simple to understand:
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During off-peak hours (when electricity demand is low, usually at night), the plant uses extra electricity from the grid. This electricity runs pumps. The pumps push water from the lower reservoir to the upper reservoir. This takes about 6.94 hours. The volume of water moved is about 3.94 million cubic metres.
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During peak hours (when demand is high, like evening time), the plant releases water from the upper reservoir back to the lower reservoir. As water falls down, it spins turbines. These turbines generate electricity. This generation happens for six hours every day.
The estimated peak annual energy generation is 2,080.55 million KWh. That is a huge amount of clean power.
Why Is This Project Important?
This project helps in two main ways:
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Strengthening peak power management – Tamil Nadu faces high electricity demand during certain hours. This plant can generate power quickly when needed.
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Enabling round-the-clock integration of renewable energy – Solar and wind power are not available all the time. This plant stores extra renewable energy as “water in the upper reservoir.” When the sun is not shining or wind is not blowing, the plant releases water to generate power. This makes renewable energy reliable 24/7.
Exam-Focused Points
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Project name: Velimalai Pumped Storage Hydro Electric Project
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Capacity: 1,100 MW (4 units of 275 MW each)
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Location: Vellimalai, Kanyakumari district, Tamil Nadu
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Latest clearance: Terms of Reference (ToR) from MoEF&CC
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Type: Closed-loop off-river pumped storage system
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First in Tamil Nadu: PPP model on BOOT basis under Section 63 of Electricity Act
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Reservoirs: Two artificial off-river reservoirs (upper: 4.39 Mcum, lower: 4.91 Mcum)
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Water circulation: 3.94 Mcum pumped up in 6.94 hours; generation for 6 hours/day
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Annual energy generation: 2,080.55 million KWh
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Key benefit: Supports peak power management and 24/7 renewable energy integration
FAQs
Q1: Where is the Velimalai Pumped Storage Hydro Electric Project located?
Ans: It is located at Vellimalai in the Kanyakumari district of Tamil Nadu.
Q2: What is the installed capacity of the Velimalai Project?
Ans: The project has an installed capacity of 1,100 MW.
Q3: What type of system is planned for the Velimalai Project?
Ans: It is planned as a closed-loop off-river system.
Q4: Will the reservoirs of the Velimalai Project be located on perennial rivers?
Ans: No, the reservoirs will not be located on perennial rivers or streams. They are artificial and off-river.