The Energy and Resources Institute (TERI) has issued two tenders to set up 12.5 MW/25 MWh and 43 MW/86 MWh battery energy storage systems (BESS) at the 33/11 kV Shivalik Grid Station and the 66/11 kV G5 Matiala, G7 Dwarka, and Goyla Khurd Grid Stations, respectively, in Delhi.

Bids for both projects must be submitted by December 30, 2025. Bids will be opened on January 1, 2026.

The tenders were issued on behalf of BSES Rajdhani.

Successful bidders must furnish a performance bank guarantee of 3% of the project cost.

The scope of work entails the design, supply, procurement, transportation, testing, installation, integration, and commissioning of the BESS projects. It also involves providing operation and maintenance services.

The tender expects the BESS projects to provide energy arbitrage/energy time-shifting, peak shaving, participation in the ancillary services market, voltage support, and black-start/backup support.

The inverters/power conversion system (PCS) to be used must mimic the inherent support structure (voltage and frequency) that traditional synchronous machines provide. The PCS must be able to initiate operations without reliance on the external grid and operate as Grid Forming Inverters.

Tender 1

Bidders must furnish an earnest money deposit (EMD) of ₹3.7 million (~$41,110).

Selected bidders must undertake the project site survey and planning. They must also provide insurance for the project.

Bidders must have commissioned and/or have under commissioning BESS of at least 1 MWh within the last five years before the bid opening date.

Bidders must have a minimum net worth of ₹120 million (~$1.33 million) as of the last date of the previous financial year or seven days before the bid submission deadline.

Tender 2

Bidders must furnish an EMD of ₹12.1 million (~$134,442).

They must have commissioned and/or have under commissioning BESS of at least 4 MWh within the last five years before the bid opening date.

Bidders must have a minimum net worth of ₹350 million (~$3.88 million).

Bidders for both projects must possess a valid type-test certificate and a battery test report from the Central Power Research Institute, the Electrical Research and Development Association, or an accredited international agency within the last five years. They must submit a “No Design Change” undertaking if the testing reports were received before this period. Reports older than 10 years will not be accepted.

Bidders must have an ISO 9001:2015 quality management system, an ISO 14001:2015 Environment management system, and an ISO 27001:2013 Information Security Management System certification.

Standalone storage systems comprised over 12% of India’s installed BESS capacity in the first half of 2025. The country had approximately 13.7 GWh of standalone battery storage under development as of June this year.