What Is a Solar EPC Company

Every time a homeowner in Jaipur gets a 3 kW solar system installed on their roof, or a factory in Coimbatore starts wheeling power from a 200 kW rooftop array, there is a company behind that outcome that most customers never fully understand. They know "the solar company" came, put up panels, and connected the electricity. But the work that company did, from the first load calculation to the DISCOM net-metering inspection, spans three distinct professional disciplines. That company is an EPC.

EPC stands for Engineering, Procurement, Construction. It is the dominant business model for solar project delivery in India, and it is how almost every solar installation you see on a rooftop was built. If you are new to the solar industry or considering starting a solar business, understanding what an EPC company actually does, and does not do, is the most important foundational concept you can learn.

This guide explains every layer: what each function means technically, how the revenue model works, what margins look like in 2026, how EPC differs from EPCO, O&M, and dealer models, and how to start and register a solar EPC company in India.

What does EPC actually stand for, each letter explained

E, Engineering

Engineering is the first and most technically demanding function. Before a single panel is procured or a single screw is tightened, the EPC's engineering function must answer four questions precisely:

1. Load calculation. How much electricity does this customer consume, and at what times? For residential, this means analysing 12 months of DISCOM electricity bills to calculate peak demand and monthly units consumed. For commercial or industrial, it means a more detailed load audit, which machines run simultaneously, what is the sanctioned load, what is the contract demand with the DISCOM?

2. System sizing. Based on consumption and roof area, what is the optimal system size in kW? A customer consuming 600 units/month in Rajasthan with high solar irradiance (typically 5.5–6.0 peak sun hours) needs a different system than the same consumption profile in West Bengal (4.0–4.5 peak sun hours). The engineering function runs this calculation and recommends the right size.

3. Electrical and structural drawings. Every net-metering application to a DISCOM requires a single-line diagram (SLD) of the electrical connection. For commercial installations above 10 kW, a structural drawing showing the mounting arrangement is often required as well. The EPC's engineering team prepares these drawings to DISCOM-specific templates, which vary across DISCOMs.

4. Equipment specification. Engineering decides which panel (wattage, cell technology), which inverter (string vs micro, brand, rating), which mounting structure (fixed tilt vs adjustable, galvanised steel vs aluminium), and which BoS (balance of system) components match the site constraints and project budget. This is not a procurement decision, it is a technical specification decision that drives procurement.

In a small EPC company (1–5 crore annual revenue), the owner typically handles engineering. In a mid-size EPC (5–30 crore), a dedicated design engineer or technical manager handles this function, often using PVGIS, Helioscope, or PVSyst for simulation.

P, Procurement

Procurement is the supply chain function, sourcing, purchasing, and logistics for all equipment and materials. In a solar project, the key procurement categories are:

• Solar panels (modules): For PM Surya Ghar residential installations, panels must be DCR-compliant and ALMM-listed (Approved Model and Manufacturer List by MNRE). Current ALMM-compliant mono PERC panels cost ₹18–24 per watt at distributor price for EPCs buying 50–200 kW monthly.
• Grid-tied inverters: BIS-certified, with 5+ year warranty and Indian service centre. String inverters from Fronius, SMA, Solis, Growatt, Delta, and Goodwe dominate the Indian market.
• Mounting structure: Hot-dip galvanised steel or anodised aluminium rails and clamps. Quality matters here, painted mild steel rusts within 3 years in coastal areas.
• DC and AC cables: BIS-marked, UV-resistant DC cables; standard armoured AC cable for the inverter-to-grid connection.
• Protection devices: DC isolators, AC MCBs, surge protection devices, earthing kit.
• Net metering equipment: Bidirectional energy meter (supplied by DISCOM or procured and submitted for DISCOM approval depending on the state).

Procurement also covers logistics: freight from the distributor's warehouse to the site, insurance in transit, and last-mile delivery. In Tier-2 and Tier-3 towns, logistics costs can be 2–4% of project value, which directly compresses margin if not priced correctly.

C, Construction

Construction is the on-site execution function: installing, wiring, testing, and commissioning the system, and then managing the post-installation DISCOM process.

Installation sequence for a typical residential on-grid system:

1. 1

   Site survey and structural assessment

   Roof material and load-bearing capacity check, shadow analysis, cable routing plan. 1–2 hours on site.

2. 2

   Mounting structure installation

   Rails and clamps fixed to the roof with anchor bolts; waterproofing applied at all penetration points. 3–5 hours for a 3–5 kW system.

3. 3

   Panel placement and DC wiring

   Panels clamped to rails, series strings wired with MC4 connectors, routed to inverter location in conduit.

4. 4

   Inverter installation and AC wiring

   Inverter wall-mounted indoors (shade, ventilation), AC cable run to main distribution board, protection devices fitted.

5. 5

   Earthing and lightning protection

   All metal parts earthed, surge protection devices installed, earth resistance tested with a megger. IS 3043 compliance.

6. 6

   Commissioning and system test

   Inverter powered, generation verified on the inverter display and app, irradiance vs output sanity-checked against simulation.

7. 7

   DISCOM net-metering application and inspection

   Application filed with SLD and photos; DISCOM inspector visits; bidirectional meter installed; net-metering connection established. Timeline: 15–60 days depending on DISCOM.

The Construction function also includes the PM Surya Ghar subsidy application if the customer is availing central subsidy, uploading installation photos, submitting invoice to the national portal, and tracking disbursement. This alone can take 30–45 days per project and is a significant operational workload for EPCs doing high volumes.

EPC revenue model, how the money works

Project margin: the core of EPC economics

The EPC revenue model is project-based: you win a contract, deliver the project, and earn the difference between revenue and direct project cost. This difference, your gross margin, is where the business lives or dies.

Working capital cycle, the cash flow challenge

The EPC revenue model has a significant working capital challenge that most newcomers underestimate. Here is a typical residential project cash flow:

The critical insight: if you have 10 projects running simultaneously and each has ₹80,000 tied up in equipment between Day 1 and Day 14 (while the advance has already been spent on equipment for an older project), your working capital exposure at any moment can be ₹8–12 lakh. This is why working capital management and the right payment milestone structure are core EPC business skills. For finance options, see solar business loan options.

EPC vs EPCO vs O&M vs Dealer, what is the actual difference

This is where a lot of confusion exists in the industry, especially among people new to solar. The four models are genuinely distinct in terms of what they do, what they earn, and what risk they carry.

EPC vs Dealer: the critical distinction

Many small operators market themselves as EPCs but operate as dealers, they take the order, sub-contract installation to a local electrician, and collect a margin on equipment. This is a valid business model but it is not an EPC. The legal and reputational risk differs significantly: an EPC holds direct warranty liability and DISCOM empanelment, while a dealer typically refers customers to an EPC or installs under an EPC's empanelment.

If you are PM Surya Ghar empanelled and file net-metering applications in your own name, you are operating as an EPC regardless of what you call yourself. See PM Surya Ghar empanelled vendor requirements for what empanelment actually entails.

EPCO: the RESCO model for commercial

EPCO (or RESCO, Renewable Energy Service Company) is relevant primarily for commercial and industrial customers. The developer installs the system at their own cost and sells electricity to the customer at a per-unit rate below their DISCOM tariff, under a 10–25 year Power Purchase Agreement (PPA). The developer owns the asset; the customer buys power. Capital requirements are high and this is not a model for early-stage EPCs.

Pros and cons of the solar EPC business model

How to register a solar EPC company in India, step by step

Starting a solar EPC company in India involves six sequential phases. The entire process can be completed in 45–90 days if documents are ready and you follow up actively.

Step 1, Choose and register your business entity

Your three options: Sole Proprietorship (simplest, personal liability, ₹3,000–8,000 setup), LLP (limited liability, 2+ partners, ₹8,000–15,000 setup), or Private Limited Company (separate legal entity, best for raising capital, ₹12,000–25,000 setup).

Most new EPCs start as proprietorships or LLPs and convert to Private Limited as revenue crosses ₹50 lakh/year or when bidding for commercial tenders.

Register your entity via MCA (Ministry of Corporate Affairs) for LLP or Pvt Ltd. Proprietorships are established through GST registration in the owner's name.

Step 2, GST registration

GST registration is mandatory above ₹20 lakh annual turnover (₹10 lakh in special category states) under CBIC GST guidelines. Register early even if below threshold, it signals credibility and lets you claim input tax credits on equipment purchases. Solar panel GST is 5%; installation service GST is 12% on the labour component. For a detailed breakdown, see GST on solar installation service.

Step 3, MSME (Udyam) registration

Free, takes 10 minutes on udyamregistration.gov.in. Gives access to priority sector lending (critical for working capital), CGTMSE loan guarantees, and government procurement preferences. No reason to delay this.

Step 4, Electrical contracting license

Most states require an electrical contracting licence from the State Electrical Inspectorate to perform solar installations legally. In Gujarat, this is the State Electrical Inspectorate's contractor registration. In Maharashtra, it is the PWD/Electrical Inspectorate contractor licence. This typically requires:

• Diploma or degree in electrical engineering (or at least one licensed supervisor)
• Class C supervisor licence for the person signing off installations
• Rs. 5,000–20,000 registration fee depending on state

For a detailed list of licences required by state, see solar business licence required.

Step 5, PM Surya Ghar vendor registration

Register on the PM Surya Ghar National Portal as a vendor. Documents required: GST certificate, business PAN, one completed installation reference, bank account details. Approval in 7–15 working days. This Vendor ID is needed for every customer subsidy application, without it, you cannot process PM Surya Ghar subsidies and you effectively lose 40–60% of residential prospects who expect the central subsidy.

Step 6, DISCOM empanelment

Each DISCOM in your service area has its own empanelment process. This typically requires your electrical contracting licence, liability insurance, and 2–5 installation references. Timeline: 2–6 weeks. For Gujarat, the relevant DISCOMs are DGVCL, MGVCL, PGVCL, and UGVCL. For Maharashtra, MSEDCL. For Delhi, BSES Rajdhani/BSES Yamuna/Tata Power DDL.

What makes an EPC company scale, and what makes it stall

The gap between EPCs doing ₹20 lakh per month and those doing ₹2 crore per month is not primarily technical skill. It is operational. The scaling EPCs have built systems for three functions that small EPCs do manually and badly.

Function 1: Sales pipeline management

An EPC without a sales CRM loses 30–40% of warm leads to follow-up failure. At ₹1.5 lakh per residential project, losing two leads a month costs ₹3 lakh in potential revenue per month, ₹36 lakh per year. This is not a minor problem. The solar sales funnel for Indian EPCs has five stages: Lead → Site Visit → Proposal → Negotiation → Close. Without a system tracking every lead at every stage, "stage 3" is a guess. See how to build a solar sales team.

Function 2: Proposal generation speed

In Indian solar, the EPC that sends a detailed proposal within 2 hours of a site visit has a 2× higher close rate than one that takes 48 hours. Most EPCs take 1–3 days because the proposal is built manually in Excel or Word. A professional proposal generator, one that calculates subsidy, net cost, EMI, and payback period automatically, compresses this to under 10 minutes.

Function 3: Post-installation tracking

DISCOM net-metering applications need active follow-up. Subsidy disbursement needs tracking. Final payment collection depends on both. Without a project tracking system, these tasks fall through cracks and create customer escalations that damage your reputation and referral rate.

EPC registration cost summary and timeline

Total estimated registration cost: ₹15,000–60,000 depending on entity type and state. The electrical contracting licence is the most time-consuming step. Start it first, in parallel with entity registration.

Key metrics every EPC owner should track

Running an EPC without tracking these numbers is flying blind. These are the six metrics that matter most:

FAQ

What is a solar EPC company in India?

A solar EPC company handles Engineering (system design, load calculation, drawings), Procurement (panels, inverters, mounting structure, BoS), and Construction (installation, commissioning, net-metering). It is the single contractor responsible for the entire solar system from design to a live grid connection.

What is the difference between solar EPC and a solar dealer?

A solar dealer sells equipment or systems but typically does not hold DISCOM empanelment or carry direct installation liability. An EPC is empanelled with the DISCOM, files net-metering applications in its own name, and carries full warranty responsibility for the installation. Many dealers sub-contract installation to an EPC.

What is the gross margin for a solar EPC company in India?

Residential solar EPC gross margins typically range from 15–30%, with the higher end achieved on small systems in Tier-2/Tier-3 markets. Commercial rooftop (10–100 kW) margins run 10–18%. PM Surya Ghar subsidised residential projects typically land at 8–12% gross because the subsidy passes through to the customer.

What licences does a solar EPC company need in India?

GST registration, business entity registration, electrical contracting licence from the state Electrical Inspectorate, PM Surya Ghar vendor registration on the national portal, and DISCOM empanelment. MSME (Udyam) registration is optional but strongly recommended for working capital loan access.

How much capital is needed to start a solar EPC company?

₹5–15 lakh in working capital is typical for a residential EPC starting out, covering simultaneous project equipment advances, registration costs, and 3 months of operating expenses. Registration fees alone total ₹15,000–60,000.

What does the Construction phase of an EPC include?

Site survey and structural assessment, mounting structure installation, panel placement and DC wiring, inverter installation and AC wiring, earthing and lightning protection, system commissioning and testing, DISCOM net-metering application filing, and PM Surya Ghar subsidy application upload if applicable.

What is EPCO and how is it different from EPC?

EPCO stands for Engineering, Procurement, Construction, and Operations. It extends the EPC model to include long-term system operation and monitoring. EPCO / RESCO / PPA models are more common in commercial solar. EPCs can evolve toward EPCO by adding Annual Maintenance Contracts to their offering.

Can I start a solar EPC company without an electrical licence?

You can register the entity and GST without an electrical licence, but you cannot legally perform installations or apply for DISCOM net metering in most states without one. The practical workaround is hiring a licensed Class C supervisor as an employee or subcontractor while you apply for your own licence, common for the first few months of operations.