Author: PPD Team Date: 12/03/2025
The transmission system for evacuating power from pumped storage projects (PSPs) in Sonbhadra District, Uttar Pradesh, is being planned to support renewable energy generation. Two major developers, Greenko and Avaada, have submitted applications for connecting a total of 3732 MW capacity from the Robertganj area in Sonbhadra.
Greenko has submitted three applications for a combined capacity of 2016 MW (3×672 MW), while Avaada has submitted two applications for 1716 MW (1120 MW + 596 MW). These PSP projects are expected to begin operations progressively between November 2026 and March 2028. However, Avaada has requested an extension for the connectivity start date, pushing it to December 2030.
The transmission system being planned will cater to the current and future power requirements of these projects. It will support up to 4 GW of PSP connectivity, ensuring that the electricity generated can be efficiently transmitted. The transmission scheme will allow optimal utilization of the system, keeping in mind the generation schedules of the projects.
One challenge highlighted by the CMD of Grid India is that large machines like the 672 MW units have not yet been integrated into the Indian power system. However, the transmission system for evacuating power from these projects has been agreed upon and will be implemented under the TBCB (Tariff-Based Competitive Bidding) route.
The proposed transmission system will include several key infrastructure elements:
- Robertsganj Pooling Station: A 765/400 kV station will be established near Robertganj, with provisions for 4×1500 MVA transformers, bus reactors, and ICT bays. This station will serve as the main hub for transmitting power from the PSPs.
- 765 kV Lines and Reactors: The system will also include 765 kV lines connecting Robertganj to other substations, along with switchable line reactors to ensure stable power transmission.
- LILO Connections: Two LILO (Line In Line Out) connections will be made to the 765 kV Varanasi-Gaya line and to the 765 kV Prayagraj line, ensuring seamless power transfer to other regions.
REC Power Distribution Company Limited (REC PDCL) has been designated as the project’s bid process coordinator (BPC).
The entire project is estimated to cost around Rs 36.26 billion and is expected to be completed within 34 months from the date of allocation, with some elements, such as the 765/400 kV ICT at Robertsganj PS expected to be completed by December 2030.