04 October 2026
India added a record 45 GW of solar in FY2026 and crossed 164 GW of installed capacity by July. Almost none of that was built by the companies whose names are on the panels. It was built by EPC contractors, the firms that engineer, procure, construct and hand over a working plant.
This guide covers the solar EPC companies in India worth knowing in 2026, how EPC contracts are actually structured, and the part most articles skip: the checks an EPC runs on a module supplier before a single panel is approved. We write this from the supply side. Credence Solar sells modules to EPCs, so the qualification section describes what we are asked for, in the order we are asked for it.
The largest solar EPC companies in India by publicly disclosed scale in 2026 are Tata Power Renewable Energy (over 10 GW executed), Sterling & Wilson Renewable Energy (about Rs 13,000 crore order book), Larsen & Toubro, Waaree Renewable Technologies (Rs 3,331 crore FY26 revenue) and Hero Future Energies. In the commercial and industrial segment, CleanMax, Fourth Partner Energy and Amplus Solar lead. SolarSquare is the largest residential specialist.
There is no official register of EPC contractors in India, so no "top 10" list, including this one, is a ranking. The table below is ordered by disclosed scale, and the sections that follow explain how EPC contracts work and how EPCs approve the module suppliers they buy from.
Three roles get mixed up in Indian solar, and the distinction matters when you are deciding who to call.
In India these lines blur more than anywhere else. Waaree, Vikram, Adani and Premier are manufacturers with EPC arms. CleanMax, Fourth Partner and Oriana are developers that do their own EPC. Tata Power manufactures modules, runs an EPC business, owns generation assets and operates a distribution company. When you shortlist, check which hat the company is wearing on your project.
Scale below is what each company has publicly disclosed. There is no official register of EPC contractors in India and no reliable count of how many operate, so treat any "top 10" list, including this one, as a starting point rather than a ranking.
| # | Company | Base | Listed | Disclosed scale | Focus |
|---|---|---|---|---|---|
| 1 | Tata Power Renewable Energy | Mumbai | Via Tata Power | Crossed 10 GW cumulative EPC execution, Jan 2026 | Utility, C&I, rooftop |
| 2 | Sterling & Wilson Renewable Energy | Mumbai | Yes | Unexecuted order value about Rs 13,000 crore, June 2026 | Utility-scale, global |
| 3 | Larsen & Toubro | Chennai, Mumbai | Yes | GW-scale solar, BESS and hybrid EPC, large Middle East portfolio | Utility, transmission |
| 4 | Waaree Renewable Technologies | Mumbai | Yes | FY26 revenue Rs 3,331 crore, 2.92 GWp order book | Utility, C&I |
| 5 | Hero Future Energies | Delhi | No | Portfolio above 7.2 GWp plus 2.9 GWh storage | Developer with EPC |
| 6 | CleanMax | Mumbai | No | Contracted capacity about 5.7 GW, March 2026 | C&I, open access |
| 7 | Mahindra Susten | Mumbai | No | 560 MWp commissioned in CY2025 | Utility, IPP |
| 8 | Rays Power Infra | Jaipur | No | 1.1 GW commissioned in FY2026, above 2.4 GWp cumulative | Utility, hybrid |
| 9 | Fourth Partner Energy | Hyderabad | No | 1.6 GW deployed, 3.5 GW under development | C&I, rooftop |
| 10 | TrueRE Oriana Power | Noida | Yes | About 1.5 GW solar portfolio, 2.5 GWh storage secured | C&I, asset recycling |
| 11 | Amplus Solar | Gurugram | No (Gentari-owned) | Distributed generation specialist | C&I, rooftop |
| 12 | KP Group | Surat | Yes | Targets 10 GW IPP and 10 GW EPC by FY32 | Utility, hybrid |
| 13 | SolarSquare | Mumbai | No | Raised USD 53 million in 2026 | Residential rooftop |
Two published figures from 2026 explain the shape of this market better than any market-size estimate.
Sterling & Wilson, a pure third-party EPC, reported gross margins steady at 9 to 10%. Waaree Renewable Technologies, the EPC arm of a module manufacturer, reported an FY26 EBITDA margin of 19.24% on revenue of Rs 3,331 crore.
The gap is the story. An EPC that buys modules on the open market earns a contractor's margin. An EPC attached to a factory captures part of the module margin too. For a developer, that means a manufacturer-linked EPC may quote more competitively on the module line and recover it elsewhere, so compare itemised scope, not headline price.
If you are weighing manufacturing against buying, our breakdown of what a solar panel manufacturing plant costs covers the economics on the other side of that trade.
| Model | Who owns the plant | What the EPC supplies | Typical use |
|---|---|---|---|
| Turnkey EPC | The client | Everything including modules, at a fixed price | Utility and large C&I |
| BOS only | The client | Everything except modules, which the client free-issues | Clients with captive module capacity or strict ALMM control |
| CAPEX | The C&I consumer | Turnkey build, consumer pays upfront | Factories wanting asset ownership and depreciation benefit |
| RESCO or OPEX | The developer | Build and own, consumer buys units under a 15 to 25 year PPA | Consumers avoiding capital outlay |
| O&M contract | The client | Operations against an availability guarantee | Post-commissioning, increasingly bundled into the EPC scope |
Whichever model you choose, the contract carries two sets of penalties. Delay liquidated damages apply if the plant misses its completion date. Performance liquidated damages apply if the commissioned plant fails its capacity or performance ratio test, usually calculated as the present value of the revenue the shortfall will cost over the PPA term. Set the minimum guaranteed capacity to what your PPA actually requires, not to a round number.
If you are costing a project rather than contracting one, our breakdown of the cost of a 1 MW solar plant sets out where the money goes line by line.
This is the part that decides whether a manufacturer gets on an approved vendor list. The order below is roughly the order it happens in.
BIS registration under IS 14286 is a legal requirement for any crystalline silicon module sold in India. For projects under government schemes and most tenders, the module model must also appear on ALMM List-I. Since 1 June 2026, covered projects additionally need modules built with cells from ALMM List-II manufacturers, though MNRE extended an exemption for net-metering and open-access projects to the end of December 2026. Our guide to BIS-certified solar panels explains how to verify a registration rather than take it on trust.
Lenders and large EPCs want third-party evidence that the module survives 25 years. The common screens are independent reliability testing, factory audits and degradation data. The Kiwa PVEL PV Module Reliability Scorecard is the closest thing the industry has to a neutral benchmark. Note that "Tier 1" is a financing classification, not a quality rating, and no Indian regulator publishes a module-supplier qualification standard beyond ALMM and BIS. Everything past compliance is industry practice.
A 25 or 30 year performance warranty is only worth the company that honours it. EPCs look at the first-year degradation figure, the annual rate after that, the guaranteed output at end of term, and whether the manufacturer has the financial strength to still exist when a claim arrives in year 18.
Where the cells come from decides whether a module qualifies for subsidy-linked and domestic content projects. Ask for the cell source in writing, not just the module brand.
Can the supplier ship the full quantity in one wattage class and one bill of materials, on the project schedule? Mixed batches cause mismatch losses and complicate warranty claims later.
For multi-MW orders the EPC or its lender will inspect the line: automation level, EL testing at multiple stages, raw material storage, and how rejects are handled. Our walkthrough of how solar panels are manufactured covers what to look for.
For a view of who supplies this market, see our list of the top solar panel manufacturers in India.
1. Comparing quotes that cover different scopes. One includes the evacuation line and transformer, another does not. Normalise the scope before you compare the rupees.
2. Treating the module as a line item. It is 40 to 50% of plant cost and the only component expected to last 25 years without replacement. Name the make, model and wattage in the contract, not just "Tier 1 module".
3. Accepting a performance guarantee without a test protocol. Specify how the capacity and performance ratio test will be run, under what irradiance conditions, and what happens if weather delays it.
4. Ignoring the O&M years. An EPC that quotes low on construction and high on the five-year O&M is not cheaper.
5. Leaving ALMM compliance to the EPC. If your scheme requires List-I modules with List-II cells, write it into the contract with a documentation obligation.
The solar EPC companies in India in 2026 range from listed utility-scale contractors like Sterling & Wilson, Tata Power Renewable Energy and L&T to C&I specialists such as CleanMax, Fourth Partner and Amplus, and manufacturer-linked arms like Waaree Renewable Technologies. Which is right depends on project size, segment and whether you want the module risk sitting with the contractor or with you.
For a module manufacturer, the qualification route is the same every time: clear the mandatory compliance gates, produce third-party reliability evidence, back the warranty with a real balance sheet, and ship consistent batches on schedule. For a buyer, those are also the four questions worth asking before approving any supplier.
By disclosed scale in 2026, the largest include Tata Power Renewable Energy, which crossed 10 GW of cumulative EPC execution, Sterling & Wilson Renewable Energy with an order book around Rs 13,000 crore, L&T, and Waaree Renewable Technologies. CleanMax, Fourth Partner Energy and Amplus lead the commercial and industrial segment.
An EPC contractor builds the plant and hands it over for a contract price, carrying penalties for delay or underperformance. A developer or IPP owns the plant and sells the electricity under a power purchase agreement. Many Indian companies do both, so confirm which role they are playing on your project.
Engineering, procurement and construction. The contractor designs the system, buys the modules, inverters, structures and cables, builds and commissions the plant, and usually provides operations and maintenance for an agreed period afterwards.
First the mandatory gates: BIS registration and, for most tenders, ALMM listing for both module and cell. Then bankability evidence such as third-party reliability testing, warranty terms and the manufacturer's financial strength, DCR status where required, delivery record, and usually a factory audit before approval.
Listed names include Sterling & Wilson Renewable Energy, L&T, Waaree Renewable Technologies, TrueRE Oriana Power and KP Group. Tata Power Renewable Energy sits within the listed Tata Power. Check current exchange filings before making any investment decision.
There is no official ranking. By disclosed execution, Tata Power Renewable Energy is the largest, having crossed 10 GW of cumulative EPC delivery in January 2026. Sterling & Wilson Renewable Energy holds the biggest reported order book among pure-play EPC contractors at around Rs 13,000 crore. Which is "best" depends on project size, segment and location.
EPC pricing is usually quoted per watt or per MW for the full scope. A turnkey ground-mounted megawatt in India costs roughly Rs 3.5 to 4 crore in 2026 including modules, with the EPC's own margin inside that figure. Pure third-party EPCs report gross margins of 9 to 10%, while manufacturer-linked EPC arms report considerably higher EBITDA margins.
Compare itemised scope rather than headline price, check whether the quote includes the transformer and evacuation line, name the module make and model in the contract, agree the capacity and performance ratio test protocol in writing, and look at the five-year operations and maintenance cost alongside the construction price. Ask for references from projects commissioned in the last 12 months.
Balance of system only. The client buys and free-issues the modules, and the EPC supplies and installs everything else: structures, inverters, cables, transformers and civil work. Clients use it when they have their own module supply or want direct control over ALMM and DCR compliance.
Credence Solar manufactures BIS-certified Mono PERC and TOPCon modules up to 745 Wp at a fully automated 2.2 GW plant in Rajkot, Gujarat, including the Quasar N 745 Wp TOPCon bifacial module. Datasheets, test reports and certifications are on our download page. For project pricing, delivery schedules or a factory visit, use our contact page, call +91 90330 72969 or email info@credencesolar.com.
