NTPC Renewable Energy Limited (NTPC REL), a wholly owned subsidiary of NTPC Green Energy Limited, has invited bids for the development of a large-scale Battery Energy Storage System (BESS) project at its Shimboo Ka Burj Solar Plant. The project involves setting up a 550 MW / 2200 MWh Inter-State Transmission System (ISTS)-connected BESS through a domestic competitive bidding process.
According to the Invitation for Bids (IFB), the selected contractor will be responsible for the complete Engineering, Procurement, and Construction (EPC) package on a turnkey basis. The scope includes design, engineering, supply, transportation, storage, installation, testing, and commissioning of the battery energy storage system. The contractor will also be required to integrate the BESS with the existing 550 MW solar plant and all associated Balance of System (BoS) infrastructure.
The project has been designed to strengthen grid stability and support the integration of renewable energy into the power system. As per the tender requirements, the battery storage system must have a design life of 25 years based on daily single-cycle operations. The system is also required to maintain a minimum monthly Round Trip Efficiency (RTE) of 80%, including auxiliary consumption at the termination point, along with a monthly availability of at least 98%.
In addition to the EPC work, the contract includes a comprehensive 15-year Operation and Maintenance (O&M) package. The O&M scope covers warranty services, annual maintenance support, performance insurance, and any necessary augmentation of the storage system. The selected bidder must ensure a minimum dispatchable capacity of 98% at the Point of Injection (POI) throughout the 15-year period, beginning with 100% capacity availability during the first year of operation.
The tender also specifies strict eligibility requirements for participating bidders. Technically, bidders must have supplied batteries with a cumulative capacity of at least 80 MWh, including one order of a minimum of 20 MWh, or have experience in executing relevant grid-connected renewable energy or process industry projects. Financially, bidders must demonstrate an average annual turnover of at least INR 3,640 million during the previous three financial years, while their net worth must be equal to or greater than their paid-up share capital.
The bidding process commenced on June 16, 2026, and documents can be downloaded until June 29, 2026. A pre-bid conference is scheduled for June 30, 2026, while bid submissions will close on July 9, 2026. Bidders are required to submit an Earnest Money Deposit (EMD) of INR 50 crore, while the bidding documents are available free of cost.
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