The Solar Energy Corporation of India (SECI) has invited bids for the balance-of-system package for a 70 MW interstate transmission system-connected solar power project with a 25 MW/50 MWh battery energy storage system at Ramagiri in the Sri Sathya Sai district, Andhra Pradesh.

The last date to submit bids is July 24, 2026. Bids will be opened on the same day.

Bidders must submit an earnest money deposit of ₹38.12 million (~$402,400) and a tender processing fee of ₹29,500 (~$311.2) plus GST.

Successful bidders must furnish a contract performance guarantee equal to 10% of the value of the supply and services contract.

The scope of work covers design, engineering, procurement, supply, construction, erection, testing, and commissioning of the project.

It also entails comprehensive operation and maintenance (O&M) services for five years.

SECI will supply the solar modules for the project.

The battery storage systems must ensure a round-trip efficiency of at least 85% and maintain availability for more than 98%.

Bidders must meet the eligibility criteria through one of the following three routes:

Route I

The bidder must have designed, supplied, installed, and commissioned grid-connected ground-mounted solar power projects with a cumulative capacity of at least 35 MW in the last seven years as of the bid submission deadline. The projects must have been operational for at least six months before the bid submission deadline.

In addition, they must have executed at least two grid-connected ground-mounted solar projects, each with a capacity of at least 7 MW, in the last seven years. Such projects must also have been in operation for at least six months before the bid submission deadline.

Route II

Bidders must have developed grid-connected ground-mounted solar projects with a cumulative capacity of at least 35 MW in the last seven years. Such projects must have been operational for at least six months before the bid submission deadline.

Additionally, they must have developed at least two grid-connected ground-mounted solar PV projects, each with a capacity of at least 7 MW, during the same period. These projects must have been operational for at least six months before the bid submission deadline.

Route III

Bidders must have executed a single project or work order costing ₹953.1 million (~$10.06 million) in power, steel, oil and gas, petrochemicals, fertilizers, cement, coal mining, coal handling, infrastructure, or any other process industry in the last seven years. The project must have been operational for at least six months before the bid submission deadline.

Additionally, they must have developed at least one electrical substation rated at 33 kV or higher and equipped with circuit breakers and power transformers. The substation must have been operational for at least six months before the techno-commercial bid submission date.

Bidders must have an average annual turnover of at least ₹571.8 million (~$6.04 million) over the last three financial years. They must also have a positive net worth and working capital of at least ₹408.5 million (~$4.31 million).

In February this year, Adyant Enersol (Datta Infra), Serentica Renewables India, AMPIN Energy Utility Nine (AMPIN Energy Transition), and ACME Solar Holdings won SECI’s auction for the assured peak supply of 4,800 MWh from FDRE ISTS-connected projects with co-located energy storage systems.

According to SECI’s latest update, it has yet to find offtakers for its FDRE auctions. It has 200 MW of available capacity from Altra Xergi Power at a tariff of ₹8.1 (~$0.085)/kWh under its 8 GWh Tranche VI FDRE auction and 899 MW from its 1.2 GW Tranche VII FDRE auction.