The Tamil Nadu Green Energy Corporation (TNGECL) has floated a tender to set up 20 MW of grid-connected rooftop solar projects on government buildings across the state under the renewable energy service company model on a net feed-in mechanism.

Bids must be submitted by December 29, 2025. Bids will be opened on December 30.

Bidders must furnish an earnest money deposit of ₹125,000 (~$1,390.03)/MW.

Selected bidders must submit a performance bank guarantee of ₹1 million (~$11,119.78)/MW.

Bidders must quote a minimum capacity of 4 MW and can quote a maximum of 20 MW.

The scope of work entails the design, engineering, supply, storage, erection, testing, commissioning, and quality control of the solar projects. It also involves providing operation and maintenance services for 25 years.

Selected bidders must undertake the civil works. They must ensure net feed-in per the Tamil Nadu Electricity Regulatory Commission Regulation 2021, conduct site visits, rooftop site surveys, solar potential assessments, and finalize the feasibility report for the identified locations.

The rooftop area for project installation will range from 2,000 sq. ft to 10,000 sq. ft.

Successful bidders must obtain the necessary government approvals and consents for the projects. They must also take comprehensive insurance for the solar projects and their associated machinery during installation, as well as for the O&M phase, covering theft, pilferage, or damage.

The projects must maintain an average capacity utilization factor (CUF) of 17% during every operational year.

The scope of work also includes making arrangements for the evacuation of power from the solar projects to the government buildings.

Only commercially established technology operating for at least one year must be used for the projects.

Selected bidders must use only components that comply with the Approved List of Models and Manufacturers List-I.

The solar projects must include monitoring systems for data acquisition and for irradiance, temperature, and DC/AC parameters. They must also consist of string/array and remote monitoring systems. These monitoring systems must be integrated with TNGECL’s centralized server.

The projects must be commissioned within 180 days.

Delays in commissioning of up to 90 days will result in encashment of the performance bank guarantee on a per-day basis. If the delay exceeds 90 days, the contract will be terminated, and the performance bank guarantee will be encashed.

Successful bidders will be penalized for failing to meet the CUF requirement.

Bidders must have a positive net worth for the previous financial year or at least seven days before the bid submission deadline. They must have an average annual turnover of ₹10 million (~$111,197.8)/MW over the last three years from the previous financial year or at least seven days before the bid submission deadline.

In November this year, TNGECL invited bids to select developers to set up a 15 MW solar project, along with a 15 MW/45 MWh battery energy storage system, in Thiruvarur, Tamil Nadu.

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