WBSEDCL’s Awards 250 MW/1,000 MWh Standalone BESS Order To PM Green

Kolkata; January 2026: 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 has 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 terms and conditions of the aforementioned read as:

• Bids must be submitted by November 14th, 2025. Bids will be opened on the same day.

• Bidders must submit ₹500,000 ($5,632) in addition to 18% GST as a document fee and ₹2,500 ($28) in addition to 18% GST as a document processing fee.

• They must also furnish ₹208,000 ($2,343)/MWh in addition to 18% GST as earnest money deposit.

• Selected bidders must submit ₹520,000 ($5,857)/MWh as a performance bank guarantee at least seven working days before signing the battery energy storage purchase agreement (BESPA).

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

• Developers must guarantee AC to AC round-trip efficiency of 90% on a monthly basis.

• Developers must use only commercially established and operational technologies to minimise the technology risk and to achieve timely commissioning.

• The BESS must be commissioned within 18 months of signing the BESPA.

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

• Developers can take planned maintenance outages, but must give at least 1 month’s notice. The total planned outage time cannot exceed 34 hours in any two months.

• Developers must state 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. The 4 hours of charging can be done in one stretch or split into multiple sessions. The 4 hours of discharging can also be in one stretch or split into 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.

• After the bidding is over but before the project starts operating, if WBSEDCL finds that a viability gap funding amount is available, it will inform the developers. In that case, developers must agree to lower the winning tariff by ₹40,000 ($450)/MW/month. Both parties will sign a short add-on agreement to record this change.

• The net worth of the bidders should be at least ₹8.32 million ($93,724) /MW, as of the last date of the previous financial year or at least seven days before the bid submission deadline.

• Bidders must have a minimum annual turnover of ₹5 million ($56,324) /MWh during the last completed financial year or as of at least seven days before the bid submission deadline.

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

At the present M/S PM Green must guarantee AC-to-AC round-trip efficiency of 90% every month. It must use only commercially established and operational technologies to minimise 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.

India also has an operational pumped storage capacity of 5 GW as of the time of the report’s publication. Strong policy support, including Tranche II of viability gap funding and the CEA’s mandate to include co-located storage in all solar tenders with a minimum duration of two hours, equivalent to 10% of solar capacity, is helping accelerate the adoption of energy storage across the country.

As of June 2025, Karnataka (33%), Chhattisgarh (24%), and Gujarat (16%) were the top three states in terms of cumulative installed energy storage capacity. 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.

As of June 2025, India had nearly 13.7 GWh of standalone battery storage, approximately 3.9 GWh of solar-plus-wind projects with storage capabilities, nearly 3.2 GWh of solar-plus-storage projects, over 1.4 GWh of solar-plus-wind projects with round-the-clock capabilities, and 415 MWh of renewable energy-plus-storage projects at various stages of development. Additionally, over 81 GW of pumped storage was in the development pipeline.

Gujarat had the largest pipeline of standalone battery storage capacity under development, followed by Maharashtra and Rajasthan. Various government agencies issued energy storage tenders totalling over 16 GW in 1H 2025 and auctioned more than 9 GW of projects, with or without associated renewable energy capacity. Solar-plus-storage tenders saw significant momentum, recording nearly 381% year-over year increase over tenders issued in 1H 2024.

Key Highlights from the India Research’s India’s Energy Storage Landscape 1H 2025 Report

• India’s cumulative energy storage capacity reached 490 MWh as of June 2025
• India added over 48 MWh of energy storage capacity in 1H 2025
• Solar-plus-storage systems accounted for approximately 56% of the cumulative installed energy storage capacity as of June 2025
• Karnataka led cumulative installed energy storage capacity, contributing over 33% of the total India had 5 GW of operational pumped storage capacity, with over 81 GW in various stages of development.
• In 1H 2025, more than 16 GW of energy storage projects were tendered, and over 9 GW were auctioned.

Team Maverick.