InSolare Energy has won Solar Energy Corporation of India’s (SECI) auction to supply the balance of system (BoS) package for a 600 MW/1,200 MWh standalone battery energy storage system (BESS) project in Kolimigundla, Nandyal District, Andhra Pradesh.

The tender was issued in August this year.

The scope of work includes the design, engineering, procurement, supply, testing, civil works, installation, erection, commissioning, and performance demonstration of the BoS components with comprehensive operation and maintenance (O&M) for five years.

The O&M scope includes preventive and breakdown maintenance, spare parts, insurance, and compliance with service level agreements mandating 100% serviceability and a maximum 72-hour fault rectification window. The scope also provides for a defect liability period of 12 months and a latent defect liability period of five years covering design and manufacturing defects.

The BESS will be interconnected with the Kurnool-3 Substation of the interstate transmission system network to implement market-based operation of the BESS at Kolimigundla.

Recently, Pace Digitek won the auction for the same project to supply DC battery blocks with HVAC and fire protection systems, along with the power conversion, battery management, and energy management systems. Pace will also handle testing and commissioning of the full system, including performance demonstrations and trial operations. It will also provide comprehensive maintenance for fifteen years after commissioning.

India added 48.4 MWh of energy storage capacity in the first half (1H) of 2025, a 74% decline from 186 MWh added in the same period last year, according to the newly released India’s Energy Storage Landscape 1H 2025 Report by Mercom India Research.

Solar-plus-storage systems accounted for nearly 56% of India’s cumulative installed capacity. This was followed by more than 32% from solar-plus-wind projects with round-the-clock capability, and over 12% from standalone battery energy storage systems. The remaining share came from floating solar with storage, and solar-plus-wind projects with storage capabilities.

India’s cumulative installed energy storage capacity reached 490 MWh by the end of June 2025.