Over the last ten years India’s solar capacity has grown fast, and government buyers are behind a big part of that. Central agencies, state utilities, PSUs, municipal bodies and individual departments all buy solar, whether it’s a rooftop system on a school or a utility-scale plant covering hundreds of acres.
For suppliers and contractors, that means a steady stream of tenders. It also means a fair amount of confusion, because “solar tender ” can mean quite different things. Some buy a finished plant. Some buy electricity under a long-term contract. Some buy only the equipment. Others ask developers to build, own and operate the plant themselves. Each model comes with its own eligibility rules, risks and commercial terms.
This guide walks through how government solar buying is set up, what buyers usually ask for, and what you should check before deciding whether to bid.
The Main Procurement Models in Government Solar
Before anything else, ask what the tender is actually buying.
EPC (engineering, procurement and construction). The government or utility owns the project. The contractor designs it, supplies the equipment, builds it and commissions it for a fixed price. It’s common for rooftop systems on government buildings and for projects paid for from public budgets. You’re paid on milestones, and you carry the design, supply and construction risk.
EPC with operation and maintenance. Same as above, with a multi-year O&M period added, often five to ten years or more. You earn recurring O&M fees, and you may have to meet performance targets such as minimum generation or plant availability.
RESCO or OPEX model. The developer puts up the money for a system on the buyer’s premises, owns and runs it, and sells the electricity to the buyer at an agreed tariff, usually for fifteen to twenty-five years. The buyer pays no capital cost. You compete on tariff, and you take the financing, performance and payment risk.
Developer tenders for power purchase. Agencies like the Solar Energy Corporation of India and state nodal agencies run auctions where developers bid a tariff to build and operate a project and sell the power under a power purchase agreement. You have to arrange land, grid connection and finance yourself. These are big, capital-heavy tenders, and the competition is mainly on tariff.
Supply only tenders. The buyer purchases specific components such as modules, inverters, mounting structures or batteries, and arranges installation separately. Rate contracts and GeM are often used for standard items.
Solar water pumping, street lighting and off grid schemes. Government programmes for agriculture, rural electrification and public lighting buy standardised systems in large numbers, often by empanelling manufacturers and installers.
Don’t rely on the tender title to tell you which model you’re looking at. The real answer is in the commercial and risk terms buried in the contract documents.
Who Buys
Solar demand comes from a wide mix of buyers.
Central agencies and renewable energy corporations that run large-scale auctions.
State renewable energy development agencies and state utilities.
Distribution companies, which buy power or install systems under state programmes.
PSUs in power, coal, oil and gas, steel, railways and ports, which put up captive solar plants for their own use.
Railways and metro corporations, which have big rooftop and land-based requirements.
Municipal corporations, urban local bodies and development authorities.
Government hospitals, educational institutions and office buildings.
Defence establishments and airports.
Every one of these buyers has its own procurement system, its own vendor approval rules and its own standard bidding documents. So it pays to be selective. Work out which buyer types fit your capability, your scale and your ability to arrange finance, and focus your search there instead of chasing every solar notice that appears.
Typical Eligibility Criteria
Eligibility depends on which model the tender uses, but a few patterns come up again and again.
Financial criteria. For EPC tenders, minimum average annual turnover and net worth are set in proportion to the project size. For developer tenders, net worth is often stated per megawatt of capacity bid, and you may have to show you have the financial strength to meet your equity commitments.
Technical experience. EPC tenders usually want solar projects completed in the last five to seven years, for example one project of at least a stated percentage of the tendered capacity, or a cumulative installed capacity. Grid-connected experience at a comparable scale is often listed separately from small off-grid work. Developer tenders may ask for experience in developing, owning or operating solar capacity.
Manufacturer and product requirements. Many tenders say modules and other equipment must meet national standards and come from sources listed under applicable government schemes. Domestic content rules, approved model and manufacturer lists and quality certifications can all apply. Check that your proposed equipment is eligible under this specific tender and any scheme attached to it, both when you bid and when you supply, because these lists and rules keep changing.
Registrations and licences. You may need an electrical contractor licence, registration with state renewable energy agencies, or empanelment with the relevant nodal agency. That’s especially true for rooftop programmes tied to subsidies. Some tenders also want you registered in the buyer’s own vendor system before you bid.
Bid security and performance security. EMD is usually set per megawatt in developer tenders and as a percentage of project value in EPC tenders. Performance security is due after award, often with extra guarantees tied to commissioning milestones. Bank guarantees are the norm, and insurance surety bonds are used where permitted. In large solar tenders these amounts can be substantial, so financing the guarantees is a real planning issue.
Manpower and safety. Many EPC tenders ask for qualified engineers and supervisors and for safety compliance, including provisions for work at height.
Always read the tender ’s own definition of eligibility. Whether experience has to be as main contractor, whether foreign experience counts and whether consortium bidding is allowed all vary a lot from one tender to the next.
Technical Requirements You Should Expect
Solar tenders carry technical specifications that drive both cost and risk, so read them closely.
System design and capacity. The tender states capacity in kilowatts or megawatts, and it should say whether that means DC or AC. The difference changes the design and how bids compare, so confirm which basis applies before you price.
Performance parameters. Typical requirements include a minimum performance ratio, annual degradation limits, plant availability and guaranteed generation. If you fall short of the guaranteed performance, you can face penalties or have to pay compensation.
Equipment standards. Modules, inverters, cables, mounting structures, earthing, lightning protection and monitoring systems all have to meet set standards and testing requirements. Pre-dispatch inspection and third-party testing are common.
Grid connection and net metering. Tenders may require you to follow grid codes, get utility approvals and go through net metering procedures. Who is responsible for connectivity approvals, and who bears the cost of delays by the distribution company, differs from one tender to another. Make sure you know where your tender puts that responsibility.
Monitoring and reporting. Remote monitoring, data access for the buyer and periodic performance reports are often required.
Site and civil requirements. Shadow analysis, structural checks on roofs, land preparation, drainage, fencing and access roads can add a lot of cost, especially on utility-scale projects.
Safety, environmental and statutory compliance. Electrical safety rules, labour laws and environmental conditions all form part of the contract.
Contract Terms That Affect Risk
Solar contracts have several features that deserve a careful read.
Milestone payments. EPC contracts usually tie payment to design approval, material delivery, installation progress, commissioning and acceptance, with a portion held back until performance is proven. Plan your cash flow around the fact that big equipment purchases happen before any large payment arrives.
Commissioning and acceptance. Commissioning needs successful testing, utility approvals and sometimes a trial run. If the utility is slow to inspect or the grid connection is delayed, acceptance and payment can be held up with it.
Liquidated damages. Late commissioning attracts liquidated damages, often capped at a percentage of contract value. Solar projects lean on third parties for approvals and grid readiness, so how the contract treats delay caused by the buyer or utility matters a great deal.
Performance guarantees and O&M obligations. Long-term performance guarantees, minimum generation commitments and penalties for low availability stretch your risk well past commissioning. Price the O&M period realistically, including equipment replacement, cleaning, insurance and monitoring.
Price variation. Module and component prices have swung sharply in the past, so a fixed-price contract with a long procurement period carries real price risk. Some tenders include price variation clauses and some don’t. Policy changes such as duties and approved manufacturer requirements add regulatory risk, so check the change in law clauses to see who bears it.
Payment security in developer models. In power purchase and RESCO models, you carry the buyer’s payment risk for many years. Letters of credit, escrow arrangements, state guarantees and the buyer’s payment history are what make the project bankable.
Land and approvals. In developer tenders, look closely at who secures the land, the evacuation infrastructure and the statutory approvals, and at what happens if they’re delayed.
Evaluation: How Solar Bids Are Compared
Smaller EPC tenders are usually decided on price. The lowest bidder among those who pass the technical check wins. Bigger or more complex EPC tenders may use quality and cost based selection instead.
Developer auctions are judged on the tariff you quote, and the lowest tariff wins. There’s often a qualification round first, and sometimes a reverse auction. Tariff caps, the split of capacity among several winners and rules about matching the lowest bid can also come into play.
Price competition in solar is fierce, so abnormally low bids are a real problem. If a bid relies on equipment prices, approvals or generation figures that can’t actually be achieved, it brings delivery and financing risk. Evaluation committees may look hard at very low EPC prices. And developers who win at a very low tariff without secure financing and equipment supply can end up never reaching commissioning.
Risks Specific to Solar Procurement
Equipment price and supply risk. Module and inverter prices and availability keep shifting, and long lead times can throw the programme off. If you haven’t locked in supply by the time you bid, you’re carrying that exposure yourself.
Policy and regulatory change. Duties, domestic content rules, approved lists and subsidy scheme terms have all changed over the years. If the contract doesn’t say clearly who bears that risk, you may end up absorbing the extra cost.
Grid and approval delays. Utilities that are slow to grant connectivity or carry out inspections are a common reason projects overrun. Keep a record of each delay and claim your extension promptly.
Performance risk. Guaranteed generation and performance ratio depend on the design, the equipment quality, the installation and the site. Yield assumptions that were too hopeful at the bid stage can turn into penalties that last for years.
Payment risk. In long-term power purchase and RESCO contracts, late payment by distribution companies and public bodies has been a recurring worry. Assessing the buyer’s credit should be part of how you evaluate the bid.
Warranty and O&M cost. Long warranties and extended O&M create liabilities that outlive the project team. Set money aside for degradation, component failures and insurance.
Subsidy scheme dependency. On rooftop and residential schemes tied to central or state subsidies, the eligibility rules, your empanelment status and when the subsidy is released all affect both the buyer and the installer.
Practical Guidance for Suppliers and Contractors
Decide which model suits you. An EPC contractor, an equipment manufacturer, an O&M specialist and a financed developer each have different strengths. Go after the tenders that fit your balance sheet and your capability.
Build your credentials on purpose. Lack of similar experience is usually the barrier. Completed projects with completion certificates, performance data and client references are what unlock bigger tenders. Smaller government rooftop jobs can be a way to build the record you need for larger contracts.
Check equipment eligibility early. Before you price anything, confirm that your modules, inverters and other equipment meet the tender ’s standards and any approved list requirements.
Lock in supply and pricing before the final bid. Get firm quotations whose validity matches your bid validity, and think about how you’ll handle price movement if the award is delayed.
Price O&M and performance obligations honestly. Model degradation, availability, cleaning, replacement and insurance across the whole term. Underpricing the long tail is a common reason solar contracts stop being profitable.
Understand the utility interface. Know who is responsible for connectivity approvals, how long that particular utility usually takes, and what relief the contract gives you if they’re late.
Plan guarantees and financing. EMD, performance security and advance payment guarantees can strain your credit limits. Arrange the instruments early, and look at alternatives such as surety bonds where the tender allows them.
Read the change in law and price variation clauses. Regulatory and price risk should be understood and priced in, not discovered halfway through execution.
Keep your documentation strong during execution. Site conditions, approval delays, buyer instructions, test results and commissioning records are what back up an extension claim and defend you against penalties.
Finding Solar Tenders
Solar tenders are posted in several places: central and state e-procurement portals, the websites of renewable energy agencies and distribution companies, PSU procurement systems, and GeM for standard items. When you search, use capacity terms like “kWp” and “MW”, along with phrases such as “grid connected rooftop solar,” “solar power plant,” “solar street lights,” “solar water pump” and “RESCO.” Each one turns up a different set of notices.
It also helps to keep an eye on buyers who tender repeatedly, such as particular utilities, railway zones and state agencies. Once you know who buys what, you can see repeat requirements coming. And don’t skip past results. They show the typical project sizes and the prices that actually won, which is useful for checking your own bids against the market.
Final Thought
There’s a lot of government solar work out there, and it will keep coming, but it rewards the firms that prepare, not the ones that are merely keen. The tenders differ sharply from one model to the next. To do well, match your capability and balance sheet to the right type, understand the technical and regulatory conditions, and price the long-term performance and payment risks honestly.
Contractors who build experience they can prove, lock in their equipment supply, handle the utility interface carefully and read how the contract divides regulatory and payment risk before they bid tend to compete well and deliver at a profit. Those who bid on price alone, without really understanding what the contract demands over its whole life, often find that winning the tender was just the start of the hard part.
