NTPC Green Energy Limited (NGEL), a subsidiary of NTPC Limited, has invited domestic competitive bids for the Balance of System (BOS) package for developing a 250 MW/1,000 MWh Battery Energy Storage System (BESS) at NTPC Kayamkulam. The tender was issued on November 9, 2026, under Invitation for Bids (IFB) No. NGEL-CS-5831-004(BESS BOS)-9.
The bidding process will follow a Single Stage Two Envelope system, involving separate techno-commercial and price bids, followed by a reverse auction. The project aims to establish a grid-connected battery storage facility with a capacity of 250 MW/1,000 MWh to support energy storage and power evacuation requirements.
The selected contractor will be responsible for the turnkey execution of the BOS package. The scope includes design, engineering, supply, packaging, inland transportation, customs clearance, unloading, storage, installation and commissioning of the BESS plant. However, the containerised battery system, including the Battery Management System (BMS), internal fire detection and Heating, Ventilation and Air Conditioning (HVAC), will be supplied by NGEL as free-issue equipment. The bidirectional grid-forming Power Conversion System (PCS) will also be provided by the company. The contractor will nevertheless handle local transportation of these components from Indian ports to the project site, along with erection and commissioning supervision.
The project will also require the construction of a new 220 kV Air Insulated Switchyard (AIS), supported by 220 kV/33 kV power transformers, pooling switchgear and associated power evacuation infrastructure up to the take-off gantry. The BESS facility will operate as a single integrated block with a capacity of 250 MW/1,000 MWh connected at the 220 kV level.
NGEL has specified a minimum designed plant life of 15 years from the completion of trial operations. The successful bidder will also be responsible for comprehensive operation and maintenance of the remaining BESS plant and electrical infrastructure for five years. Separate comprehensive Annual Maintenance Contracts (AMCs) for the battery system and PCS will be managed by NGEL.
Other project requirements include Energy Management Systems (EMS), Supervisory Control and Data Acquisition (SCADA), site grading, a control room building, civil construction, metering as per Kerala State Electricity Board Limited (KSEBL) standards, internal roads, earthing systems and complete CCTV coverage.
According to the tender schedule, document sales will begin on November 16, 2026, at 17:00 hours and close on November 27, 2026, at 17:00 hours. The deadline for bid submission is December 11, 2026, at 14:00 hours, while bids will open at 14:30 hours on the same day.
The abridged tender notice does not specify the Earnest Money Deposit (EMD) or Performance Bank Guarantee (PBG) requirements. Interested bidders must refer to the detailed bidding documents available through the Bharat Electronic Tender or NTPC tender portals for complete eligibility criteria, technical specifications and financial requirements.
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