The Mahatma Phule Renewable Energy & Infrastructure Technology (MAHAPREIT) has invited bids to install 100 MW of behind-the-meter (BTM) rooftop solar projects, with or without battery energy storage systems, in Maharashtra.

The projects must be developed under the renewable energy service company (RESCO) model.

The last date to submit bids is June 23, 2026. Bids will open on June 24.

Bidders must furnish bid security of ₹225,000 (~$2,363)/MW and a performance guarantee of up to 2.5% of the contract value for the quoted package.

They must submit a tender document fee of ₹10,000 (~$105) and a tender processing fee of ₹100,000 (~$1,050)/MW.

Successful bidders must furnish a facilitation charge of 6% of project cost of the allotted capacity.

The scope of work covers the design, engineering, supply, financing, installation, testing, and commissioning of solar systems, with or without battery energy storage, along with comprehensive operations and maintenance for 25 years.

It also includes installing a generation meter and a net meter for the project.

The project has been divided into four packages of 25 MW each: 20 kW to 100 kW solar projects (A1-S); 20 kW to 100 kW solar projects with 30% battery storage for 2 hours (A1-B); and 101 kW to 250 kW solar systems (A2-S). It also includes 101-250 kW solar systems with 50% battery storage for 2 hours (A2-B).

The estimated project cost of solar systems under the A1-S package is ₹50 million (~$525,087)/MW, ₹70 million (~$735,121)/MW for A1-B, ₹50 million (~$525,087)/MW for A2-S, and ₹80 million (~$840,139)/MW for A2-B.

The battery energy storage system must be designed to supply at least 2 hours of continuous discharge. It must also have a battery management system with cell-level monitoring, thermal management, and fault isolation.

Bidders can quote for a minimum capacity of 5 MW and a maximum capacity of 75 MW. They must quote at least 10% of the capacity from solar systems under the A1 package

The Maharashtra Renewable Energy Policy 2025–36 has set a target of a 65% share of renewable energy by the financial year 2035–36 and energy storage equivalent to at least 10% of DISCOM demand by FY 2036.

Bidders must ensure a rated battery energy storage capacity of at least 80% at the end of 10 years and 70% at the end of 15 years. They must quote tariffs accounting for battery cell/module replacement costs to meet these guarantees. They must also maintain a capacity utilization factor of at least 19%.

Solar systems with capacities ranging between 10 kW and 100 kW must be interconnected at the 415 V three-phase level, and solar systems with capacities exceeding 100 kW must be interconnected at the HT/EHT level of 11 kV, 33 kV, or 66 kV.

The project must use modules and cells that comply with the approved list of models and manufacturers and must be commissioned within 12 months.

Bidders must have  commissioned a cumulative capacity of at least 2 MW of grid-connected rooftop, ground-mounted, or BTM solar systems in the last five years. At least one of the systems must have been operational for at least one year.

They must also demonstrate the capability to provide O&M for solar-plus-battery energy storage systems over a 25-year period.

For packages with a battery storage component, bidders must have commissioned a battery energy storage system of at least 0.5 MW/1 MWh in the last five years.

Alternatively, they may have signed a memorandum of understanding or agreement with a battery energy storage system original equipment manufacturer or system integrator with BIS/IEC 62619 certification.

They must also submit an undertaking to facilitate online prior intimation on the Maharashtra State Electricity Distribution Company’s Renewable Energy portal for each system to obtain a Central Electricity Authority/Electrical Inspector compliance certificate or a licensed electrical contractor certificate for systems up to 200 kW.

Bidders must have a minimum net worth of ₹2.5 million (~$26,255)/MW in FY 2025 and an annual turnover of at least ₹10 million (~$105,017)/MW in the last three financial years.

Solar modules for the project must be from the Approved List of Models and Manufacturers (ALMM) List I, and solar cells must be from ALMM List II.

In February 2026, MAHAPREIT invited bids to set up 2 MW of rooftop solar projects under the RESCO model at the buildings of the Valsad District Cooperative Milk Producers’ Union in Nagpur, Maharashtra.

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