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TNGECL Invites Bids for 375 MW/1,500 MWh Standalone BESS Projects in Tamil Nadu

TNGECL has issued a tender to develop 375 MW/1,500 MWh of standalone BESS projects across Tamil Nadu under the BOO model. Bid submission ends on December 22, 2025.

November 19, 2025. By Mrinmoy Dey

TNGECL has floated a tender for developing seven standalone battery energy storage systems (BESS) of cumulative capacity of 375 MW/1,500 MWh in Tamil Nadu.

The projects will be set up under the build, own, operate (BOO) model and will be eligible for viability gap funding (VGF) support of INR 18 lakh/MWh.

A total of 800 MWh needs to be set up in Coimbatore across three substations – Anaikadavu SS (400 MWh), Karamadai SS (300 MWh) and Palladam SS (100 MWh). 400 MWh of BESS must be set up in Trichy – Thatchankurichi SS (200 MWh) and Thiruvarur SS (200 MWh). There will be one BESS project each in Madurai – Thappagundu SS (200 MWh) and Tirunelveli – N. Subbaihpuram SS (100 MWh).

Bidders must pay INR 15 lakh (plus GST) as a bid processing fee. Further, they need to furnish INR 2 lakh/MW as an earnest money deposit (EMD). Selected bidders must submit a Performance Bank Guarantee (PBG) for a value equivalent to 40 percent of the annual payment due to the developer prior to signing of BESPA.

The last date for submission of bids is December 22, 2025. The techno commercial bids will be opened on December 23, 2025.
The minimum bid size must be 25 MW x 4 hours (100 MWh). A maximum of 175 MW/ 700 MWh shall be allocated to a single bidder.

The BESSD shall be required to set up a BESS, with the primary objective of making the energy storage facility available to the buying entity, i.e., TNPDCL, for charging/ discharging of the BESS, on an ‘on demand’ basis. The BESPA shall be valid for a period of 15 years from the date of full commissioning of the project.

Land allocation for the Projects will be under the scope of TANTRANSCO. Setting up of the BESS and interconnection of the BESS with the STU network will be under the scope of the BESSD.

The application software of the Energy Management System (EMS) of the BESS must be developed indigenously within India. Further, the BESSD must ensure that the BESS installed is of requisite quality as per best industry practices, and refurbished battery cells are not used in the project.

The BESS shall be charged by drawing power from TANTRANSCO/TNPDCL and injecting power into the TANTRANSCO/TNPDCL network. TNPDCL will provide the required power for charging BESS, considering the minimum system efficiency under the agreement.

The bidder must ensure that the BESS can charge and discharge with a Crate of 0.25. Additionally, the BESS must be capable of being charged or discharged in groups from 25 MW/100 MWh to 50 MW/200 MWh, up to the total rated capacity specified in the agreement.

The BESSD must make the BESS available for 1.5 full operational cycles per day, i.e., 1.5 complete charge-discharge cycles per day. The BESSD must guarantee a minimum system availability of 95 percent on an annual basis.

The tender proposes to promote only commercially established and operational technologies to minimise the technology risk and to achieve the timely commissioning of the projects.

The net worth of the bidder must be at least INR 40 lakh/MWh of the quoted capacity (in MWh), as on the last date of FY25, or as on the day at least 7 days prior to the bid submission deadline.

Additionally, they must have a minimum average annual turnover of INR 50 lakh/MW of the quoted capacity during the previous three financial years. Alternatively, the bidders must demonstrate internal resource generation capability, in the form of Profit Before Depreciation Interest and Taxes (PBDIT) for a minimum amount of INR 5.38 lakh/MW as on the last date of FY25, or as on the day at least 7 days prior to the bid submission deadline.

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Energy Storage

TNGECL invites bids

TNGECL BESS tender

Standalone BESS tender

Standalone BESS in Tamil Nadu

BESS projects in Tamil Nadu