The Calcutta Electric Supply Corporation (CESC) has invited bids to develop 600 MW of interstate transmission system (ISTS)-connected wind-solar hybrid projects under a build-own-operate model.

The last date to submit bids is January 19, 2026. Bids will be opened on January 20.

Bidders must submit an earnest money deposit of ₹2 million (~$22,417.4)/MW per project. They must also submit a performance bank guarantee amounting to ₹2.3 million (~$25,780)/MW for the solar component and ₹3.2 million (~$35,867.8)/MW for the wind component of the projects.

They must also submit a bid processing fee of ₹500,000 (~$5,604.35) plus 18% GST for each project, and a document fee of ₹29,500 (~$330.6).

The scope of work covers the setting up of the wind-solar hybrid projects, including the transmission network up to the interconnection point.

It also entails identifying the land, installing and owning the projects, and obtaining the approvals.

The power generated from the projects will help CESC meet its renewable power and renewable consumption obligations.

Selected bidders must bid for a minimum capacity of 50 MW and a maximum of 300 MW.

The projects must be designed for interconnection with the ISTS transmission network at a voltage level of at least 220 kV.

CESC will sign a 25-year power purchase agreement with the successful bidders.

Successful bidders may be developers who have already commissioned wind-solar hybrid power projects or are in the process of constructing such projects and have untied capacities.

The wind and solar components of the projects must be n the ratio of at least 2:1.

The projects must maintain a minimum annual capacity utilization of 50%.

The projects must be completed within 20 months from the signing of the power purchase agreement.

Successful bidders must use only commercially established and operational technologies to minimize technological risk and achieve timely project completion.

The projects must use modules listed in the Approved List of Models and Manufacturers, and wind turbines listed under ALMM (Wind).

The modules must provide peak output wattage of at least 90% at the end of 10 years and 80% at the end of 25 years. They must be warranted for failures due to material defects and workmanship for at least 10 years, and the solar system’s mechanical structures, electrical works, and overall workmanship must be warranted for up to five years.

The inverters used in the projects must have a warranty of at least five years.

GPS-enabled automatic weather stations must also be set up along with the projects.

Bidders must have a net worth of at least ₹9.4 million (~$105,362)/MW for the solar component and ₹12.98 million (~$145,489)/MW for the wind component.

They must have a minimum annual turnover of ₹9 million (~$100,878)/MW in the last financial year or at least  seven days before the bid submission deadline.

They must also have profit before depreciation, interest, and taxes of at least ₹1.8 million (~$20,175.7)/MW in the last financial year or within seven preceding the bid submission deadline.

In January 2025, Purvah Green Power, a subsidiary of CESC, won a 150 MW ISTS-connected wind-solar hybrid power project from CESC. The project includes an additional 150 MW of capacity under the greenshoe option. The project was awarded in accordance with the guidelines for tariff-based competitive bidding for grid-connected wind-solar hybrid power projects issued by the Ministry of Power.

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