NTPC Renewable Energy Limited, a subsidiary of NTPC Limited, has announced a major tender for developing a large Battery Energy Storage System at the Khavda Solar Park. The company has released an Invitation for Bids for an Engineering, Procurement, and Construction package to set up a 100 MWh Vanadium Redox Flow Battery Energy Storage System. The notice was issued on 18 November 2025, and the detailed bidding documents were made available from 20 May 2025 on the government and NTPC tender portals. This tender marks an important step toward building advanced storage infrastructure to support India’s growing renewable energy capacity.
The project aims to install a 16.7 MW / 100 MWh grid-connected storage system based on Vanadium Redox Flow technology. This technology has been chosen because it offers long operational life and strong cycling performance, which are essential for large-scale grid use. The contractor selected through this bidding process will be responsible for the complete turnkey delivery of the system. This means the contractor must handle the full process from design and engineering to supply, construction, installation, testing, and commissioning.
The new storage system will be integrated with the existing 33 kV pooling substation at the solar park. This is important to ensure smooth evacuation of stored power and proper coordination with the current grid setup. The project requires strict compliance with all technical and safety standards, considering local conditions such as high temperatures and corrosive environments. The system will include several important components, such as the Battery Management System, Energy Management System, Power Conversion System, and other civil and electrical works needed to keep the plant running safely and efficiently. Firefighting systems and auxiliary power systems are also included to ensure smooth and safe operations.
One of the key features of this tender is the long-term outlook for the project. The BESS system, including the battery, is designed for a life of 25 years from the date it is commissioned. Along with this, the contractor must provide ten years of operation and maintenance services. This ensures that the system remains reliable and maintains guaranteed performance levels. These performance guarantees include limits on annual degradation and requirements for Round Trip Efficiency.
The bidding process will follow a Single Stage Two Envelope system. In this method, bidders submit their technical proposals and financial proposals in separate envelopes, allowing NTPC REL to evaluate them in phases. The technical evaluation is carried out first, followed by the financial evaluation of only the qualified bidders.
Through this large-scale storage project, NTPC REL is showing its commitment to strengthening India’s renewable energy sector. Developing a long-duration, high-capacity storage system like the Vanadium Redox Flow BESS is crucial for supporting solar energy, which depends on weather conditions. This project will help the grid handle the variability of renewable energy and ensure a stable power supply. The tender highlights how India is moving ahead with advanced technologies to build a strong energy storage foundation for the future.
Discover more from SolarQuarter
Subscribe to get the latest posts sent to your email.
