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PM Green Secures WBSEDCL Contract for 1,000 MWh Standalone Battery Storage Project in West Bengal

PM Green, a wholly owned subsidiary of Power Mech Projects, has emerged as the successful bidder in an auction conducted by the West Bengal State Electricity Distribution Company (WBSEDCL) for the development of a 250 MW/1,000 MWh standalone Battery Energy Storage System (BESS) at the Goaltore substation in Paschim Midnapore.

According to regulatory disclosures, PM Green is the lead member of the consortium that won the tender, which was originally issued in October 2025. The company has estimated revenue generation from the base project at approximately Rs15.63 billion ($173.55 million).

The award also includes a greenshoe option for an additional 250 MW/1,000 MWh BESS to be developed at the Durgapur Projects campus. If exercised, the combined capacity would double, taking the total potential revenue to around Rs31.26 billion ($347.08 million).

Project Design and Performance Requirements

The standalone BESS will be interconnected with the WBSEDCL network at the 132 kV bus of the Goaltore substation. PM Green is required to ensure a minimum monthly AC-to-AC round-trip efficiency of 90% and deploy only commercially proven and operational technologies to reduce technology-related risks and support timely project completion.

The system must be commissioned within 18 months from the signing of the Battery Energy Storage Purchase Agreement (BESPA). The agreement will remain valid for a 15-year term from the scheduled commissioning date.

Under the contract conditions, PM Green is permitted to undertake planned maintenance outages, provided a minimum one-month advance notice is given. However, cumulative planned outages must not exceed 34 hours in any two-month period.

The company must also specify the maximum recovery time between charge and discharge cycles, which cannot exceed one hour.

Operational Obligations

The BESS is required to deliver a minimum of four hours of continuous discharge at rated power. WBSEDCL will not request more than one full four-hour discharge cycle per day at rated capacity. Charging and discharging operations may be carried out either in a single continuous cycle or across multiple sessions.

Dispatch may occur at rated or lower power levels, based on WBSEDCL’s instructions. The total daily energy discharged will be governed by the agreed round-trip efficiency of the energy supplied for charging.

With this win, PM Green strengthens its presence in India’s fast-growing energy storage market, supporting grid reliability and renewable energy integration in West Bengal.