PM Green, wholly owned subsidiary of Hyderabad-based Power Mech Projects, won West Bengal State Electricity Distribution Company’s (WBSEDCL) auction to set up 250 MW/1,000 MWh standalone battery energy storage systems (BESS) at Goaltore substation, Paschim Midnapore.

The company pegged revenue generation from the project at ₹15.63 billion (~$173.55 million).

Since it also received the greenshoe capacity of an additional 250 MW/ 1,000 MWh to be established at the Durgapur Projects campus, the total potential revenue would rise to ₹31.26 billion (~$347.08 million).

The bourse filing mentions PM Green as the lead member of the consortium that won the auction.

The tender was issued in October last year.

The BESS should be designed for interconnection with the WBSEDCL network at the 132 kV bus at the Goaltore substation.

PM Green must guarantee AC-to-AC round-trip efficiency of 90% every month.

It must use only commercially established and operational technologies to minimize the technology risk and to achieve timely commissioning.

The BESS must be commissioned within 18 months of signing the battery energy storage purchase agreement.

The BESPA will be signed for 15 years from the scheduled commissioning date.

PM Green can take planned maintenance outages, but must give at least a month’s notice. The total planned outage time cannot exceed 34 hours in any two months.

It must specify the maximum time needed to bring the BESS back to readiness between cycles. This must not be more than 1 hour.

The BESS must be designed to provide at least 4 hours of discharge at rated power.

WBSEDCL will not ask for more than one full 4-hour discharge per day at rated power. Charging and discharging can be done in a single session or split across multiple sessions.

Charging or discharging may be at or below rated power, as WBSEDCL decides. The total energy discharged each day will be limited by the agreed round-trip efficiency of the energy supplied for charging.

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 India’s Energy Storage Landscape 1H 2025 Report by Mercom India Research.