Vismaya Renewables India Project, a subsidiary of UPC Renewables, Hexa Climate Solutions, Purvah Green Power, and Sprng Energy, have won Calcutta Electric Supply Corporation’s (CESC) auction to develop 600 MW of interstate transmission system (ISTS)-connected wind-solar hybrid projects across India under a build-own-operate model.

Vismaya Renewables won 100 MW at a tariff of ₹3.74 (~$0.0412)/kWh. Hexa Climate Solutions and Purvah Green Power secured 100 MW and 300 MW, respectively, at a tariff of ₹3.75 (~$0.0413)/kWh.

Sprng Energy was awarded 100 MW of the 200 MW quoted capacity under the bucket-filling method at a tariff of ₹3.75 (~0.0413)/kWh.

The tender was floated in November last year.

The scope of work covers the setting up of 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.

The solar and wind project components of the hybrid project may be located at the same or different locations.

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 (PPA) with the successful bidders.

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

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 from the Approved List of Models and Manufacturers (ALMM) List I, cells used must be from ALMM List II, 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.

In January last year, Purvah Green Power won a 150 MW ISTS-connected wind-solar hybrid power project from CESC. The project included an additional 150 MW of capacity under the greenshoe option.

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