Solar Energy Corporation of India’s (SECI) auction for setting up 2,000 MW ISTS-connected Solar PV projects with 1,000 MW/4,000 MWh Energy Storage Systems (ESS) (Tranche-XX) has discovered an L1 (lowest bid) price of INR 2.86/kWh.

This is about nine percent lowered than the earlier L1 in Plus 4-Hours of BESS category. The last price discoveries for Solar Plus 4-Hours of BESS were INR 3.52/kWh (SECI), INR 3.32/kWh (SJVN) and INR 3.13/kWh (NHPC).

Welspun Renewable Energy, MB Power (Madhya Pradesh), Shivalaya Construction, Oswal Cables, Purvah Green Power, Banyan Insolation (Datta Infra), LC Infra Projects, Stockwell Solar Services, SAEL Industries, GH2 Solar, and Navayuga Green Energy have emerged as winners.

Welspun Renewable Energy, MB Power (Madhya Pradesh), Shivalaya Construction, Oswal Cables, Purvah Green Power, Banyan Insolation (Datta Infra), LC Infra Projects, and Stockwell Solar Services have quoted INR 2.86/kWh to secure 200 MW, 150 MW, 600 MW, 50 MW, 300 MW, 100 MW, 50 MW, and 80 MW, respectively.

SAEL Industries and GH2 Solar have bagged 300 MW and 50 MW, each, at a tariff of INR 2.87/kWh.

Navayuga won 120 MW out of the quoted capacity of 300 MW under the bucket filing method at a tariff of INR 2.87/kWh.

The tender for this was floated in June 2025.

Selected bidders must develop a transmission network up to the interconnection point at 220 kV or above, including land identification, project installation, ownership, and securing all necessary connectivity and approvals with the ISTS network.

Each project must include an energy storage system with a minimum capacity of 0.5 MW/2 MWh for every 1 MW of installed capacity, either owned by the developer or arranged through a third-party provider. The system must maintain a minimum capacity utilization factor (CUF) between 19 percent and 30 percent.

SECI will enter into a 25-year power purchase agreement (PPA) with the selected bidders, with full project supply scheduled to begin within 24 months of the PPA’s effective date. Only solar cells and modules listed in the Approved List of Models and Manufacturers (ALMM) should be used in the project.