NTPC Green Energy Limited (NGEL), a wholly owned subsidiary of NTPC Limited, has invited bids for the development of a large-scale Battery Energy Storage System (BESS) project with a total capacity of 7,800 MWh. The project will be developed at the NTPC Renewable Energy Limited (REL) Bikaner Solar Plant in Rajasthan and will be executed through an Engineering, Procurement, and Construction (EPC) contract.
According to the tender notification issued on May 29, 2026, the bidding process will be conducted through domestic competitive bidding using a Single Stage Two Envelope system. This process includes a Techno-Commercial Bid and a Price Bid, followed by a Reverse Auction to determine the final successful bidder.
The proposed BESS capacity will be distributed across five separate blocks within the Bikaner solar facility. Block-1 will have a capacity of 500 MW/2000 MWh at PSS-1, while Block-2 will have a capacity of 550 MW/2200 MWh at PSS-2. Block-3 and Block-4, both located at PSS-3, will each contribute 300 MW/1200 MWh. Block-5 will also have a capacity of 300 MW/1200 MWh, taking the total storage capacity to 7,800 MWh.
The storage systems will be connected at the 33 kV level of the designated solar plants. The capacities mentioned in the tender represent the actual deliverable energy capacity that must be achieved at the Point of Interconnection (POI) on the Commercial Operation Date (COD).
The selected EPC contractor will be responsible for the complete project execution on a turnkey basis. This includes design, engineering, manufacturing, supply, transportation, storage, installation, testing, and commissioning of the battery energy storage systems. The bidder must also consider auxiliary consumption and transmission losses while determining the guaranteed discharge capacity. The tender specifies a mandatory consideration of 1% transformer losses and 0.25% transmission line losses.
NGEL has also outlined strict technical requirements for the project. The installed battery capacity for each block must be at least 110% of the specified energy capacity. The battery systems are required to have a design life of 25 years and support a minimum of 10,000 operating cycles.
In addition to project construction, the successful bidder will provide operation and maintenance services for 15 years under an Annual Maintenance Contract or Service Level Agreement. The system must maintain a minimum dispatchable capacity of 92% at the POI over the contract period, with 100% capacity at COD and 95% during the first year. The project must also achieve a minimum monthly round-trip efficiency of 80% and annual availability of 98%.
The bidding documents will be available for download from June 5 to June 15, 2026. The last date for bid submission is June 25, 2026, by 3:00 PM, while the Techno-Commercial bids will be opened on the same day at 3:30 PM through the electronic tender portal.
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