Every week, hundreds of Delhi homeowners and business owners search online for a Best solar EPC company in Delhi — and most end up overwhelmed. With dozens of companies claiming to be the best, offering prices that vary wildly and promises that sound almost identical, making the right choice feels genuinely difficult. Pick well, and you’ll enjoy decades of lower electricity bills, reliable energy independence, and a system that actually performs as promised. Pick poorly, and you could be left with substandard panels, voided warranties, and no one to call when something goes wrong.
This guide gives Delhi homeowners and business owners a clear, practical framework for evaluating any solar company before committing. No vague advice — just the ten specific factors that actually separate a trustworthy solar EPC partner from one you’ll regret.
What Is a Solar EPC Company?
EPC stands for Engineering, Procurement, and Construction. A solar EPC company doesn’t just sell you panels — it handles your entire solar project from start to finish. This includes:
- Engineering: Site survey, shadow analysis, load calculation, and system design tailored to your roof and consumption
- Procurement: Sourcing and supplying solar panels, inverters, mounting structures, cables, and protection devices
- Construction: Physical installation, wiring, commissioning, and ensuring the system is grid-ready
- Post-installation: Net metering application, subsidy processing, and long-term AMC support
A genuine solar EPC company in Delhi acts as your single point of accountability across the entire project — unlike vendors who only supply materials and leave you to coordinate the rest yourself.
Why Choosing the Right Solar Company Matters
Solar is not a short-term purchase. The panels on your roof will be there for 25 years, and your inverter for at least 10. The company you choose today needs to be capable of backing those warranties — and ideally, still operating — for the long run. Here’s what’s actually at stake:
| Decision | Good Solar Company | Poor Solar Company |
|---|---|---|
| Panel Quality | ALMM-listed, Tier-1 brands | Unverified imports, no datasheets |
| Subsidy Processing | Handles all paperwork end-to-end | Leaves it entirely to you |
| Net Metering | Coordinates with BSES/TPDDL directly | Unclear if they even assist |
| Post-Installation | AMC, monitoring, quick local support | Unreachable after payment clears |
| System Performance | Matches or exceeds generation estimate | Underperforms due to poor sizing |
| Warranty | In writing, backed by manufacturer | Verbal promises, nothing documented |
The difference between these outcomes often comes down to the 10 factors below. Evaluate any company — including us — against this checklist before you decide.
10 Essential Factors to Consider Before Choosing a Solar EPC Company in Delhi
MNRE Empanelment and DISCOM Registration
This is non-negotiable. To claim the PM Surya Ghar central subsidy, your installation must be carried out by an MNRE approved solar company in Delhi registered on the pmsuryaghar.gov.in portal. Additionally, your chosen company should be registered with your local DISCOM — BSES Rajdhani, BSES Yamuna, or Tata Power-DDL — as an empanelled vendor for net metering applications.
- Ask for the vendor’s MNRE registration number and verify it on the portal
- Confirm they’re listed with the relevant DISCOM for net metering work
- Unregistered vendors cannot legally process your subsidy application
Track Record and Number of Completed Installations
Experience in rooftop solar installation in Delhi specifically matters far more than general construction experience. Delhi’s unique combination of flat RCC rooftops, DISCOM bureaucracy, and summer heat loads requires hands-on familiarity with local conditions. A company with hundreds of completed installations across diverse building types will navigate these nuances confidently.
- Ask for a portfolio of completed projects in your area or similar property type
- Government and institutional projects are a strong credibility signal
- Request 2–3 customer references you can actually contact
Quality of Panels — ALMM-Listed Brands Only
Not all solar panels are equal, and in India’s market, counterfeit and underperforming imports have been a real concern. The MNRE maintains an Approved List of Models and Manufacturers (ALMM) for solar panels — any panel used in a subsidized installation must be on this list. Beyond ALMM compliance, look for Tier-1 classification from independent agencies like Bloomberg NEF, which tracks manufacturer financial stability and production consistency.
- Verified brands: Adani Solar, Waaree, Vikram Solar, Tata Power Solar
- Ask for the exact panel model and verify it on the ALMM portal
- Request the panel’s technical datasheet showing efficiency and degradation specs
Inverter Brand, Warranty and After-Sales Service
Your inverter is the brain of your solar system — and statistically, the component most likely to require service or replacement during the system’s lifetime. A good best solar company in Delhi will be transparent about the inverter brand, its warranty terms, and crucially, whether that brand has a local service center in Delhi NCR. An inverter warranty means nothing if the nearest service point is in another city.
- Reputable brands: Luminous, Growatt, Solis, SMA, Delta, Fronius
- Minimum 5-year inverter warranty — 10 years for hybrid models
- Confirm local service availability before signing any contract
Proper Site Survey — Not a Phone Quote
Any solar plant installation company in NCR that provides a final quote without visiting your property is guessing. A legitimate site survey covers: roof orientation and slope, shadow mapping at different times of day, structural load-bearing assessment, existing wiring and distribution board condition, sanctioned load from the DISCOM, and proximity of panels to the main DB. These variables directly affect system sizing, performance, and safety.
- Refuse any “final quote” given purely over the phone or online
- The survey report should include a shadow analysis and generation estimate
- Ask what changes from the survey would affect the quoted price
Transparent, Itemized Quotation
A quotation that shows only a single total figure — “5kW system for ₹2,80,000” — tells you almost nothing. A legitimate best EPC company in Delhi will itemize every component: panel brand and wattage, inverter make and model, mounting structure type, cable specifications, protection devices, net metering charges, and installation labor. This transparency allows you to compare quotes fairly and prevents hidden costs from surfacing after installation.
- Always demand a line-item breakup — never accept a bundled price alone
- Confirm whether GST, net metering application fees, and DISCOM charges are included
- A written quote protects you legally if specs are changed at installation
Subsidy Assistance and PM Surya Ghar Processing
The solar panel subsidy in Delhi under PM Surya Ghar Muft Bijli Yojana can offset up to ₹78,000 from your system cost — but the application process on pmsuryaghar.gov.in involves multiple steps, documentation, and DISCOM coordination. A reliable rooftop solar company in Delhi handles this entire process on your behalf, from registering your application to following up with the DISCOM post-commissioning until the subsidy is credited to your account.
- Confirm subsidy assistance is included in the service, not an add-on
- Ask for the estimated timeline from installation to subsidy credit (typically 30–60 days)
- Verify the company is registered on the PM Surya Ghar vendor portal
Workmanship Warranty and AMC Terms
Panel manufacturers warrant their panels. Inverter brands warrant their inverters. But who warrants the actual installation quality — the mounting bolts, the conduit runs, the earthing, the connector crimps? That’s your installer’s workmanship warranty, and it’s entirely separate from equipment warranties. A credible solar EPC company in Delhi will offer a minimum 5-year workmanship warranty in writing, plus Annual Maintenance Contract (AMC) options for ongoing cleaning and performance checks.
- Minimum acceptable: 5 years workmanship warranty in the signed agreement
- Ask what the AMC covers — cleaning, inspection, inverter health checks
- Confirm the company has a local service team, not an outsourced one
Performance Monitoring and Reporting
A solar system that isn’t monitored is a system you can’t trust. Modern inverters come with Wi-Fi-enabled monitoring apps that track daily generation, export figures, inverter health, and any fault codes in real time. The best solar company in Delhi will set up monitoring on your system, walk you through the app, and ensure you can see your generation data from day one — because a company that monitors your system has a long-term stake in it performing well.
- Ask which monitoring platform or app is included with the inverter
- Confirm the monitoring covers generation, consumption, and export data
- Real-time fault alerts allow issues to be caught before they compound
Customer Reviews, References and Local Reputation
For a rooftop solar company in Delhi, local reputation is everything. Check Google Business reviews specifically — not just the star rating, but the content of reviews: do customers mention after-sales responsiveness, system performance, and subsidy processing? For high-value commercial projects, ask for references you can call directly. A company with 1,000+ installations has a broad base of customers in Delhi NCR — you should be able to speak to at least two or three.
- Search: company name + “Google reviews Delhi” + recent (past 12 months)
- Pay attention to how the company responds to negative reviews
- Government project completions (public buildings, institutions) are verifiable credentials
| # | Factor | What to Ask | Must Have? |
|---|---|---|---|
| 1 | MNRE Empanelment | Registration number on pmsuryaghar.gov.in | ✅ Yes |
| 2 | Installation Track Record | Portfolio + customer references | ✅ Yes |
| 3 | ALMM Panel Brand | Panel model + ALMM verification | ✅ Yes |
| 4 | Inverter Brand & Service | Brand + local service centre location | ✅ Yes |
| 5 | Physical Site Survey | Shadow analysis + written sizing report | ✅ Yes |
| 6 | Itemized Quote | Line-item breakup including GST | ✅ Yes |
| 7 | Subsidy Assistance | PM Surya Ghar portal registration | ✅ Yes |
| 8 | Workmanship Warranty | Minimum 5 years in writing | ✅ Yes |
| 9 | Performance Monitoring | App name + what it tracks | ✅ Recommended |
| 10 | Local Reputation | Google reviews + direct references | ✅ Recommended |
PM Surya Ghar Yojana: Solar Panel Subsidy in Delhi (2026)
Understanding the subsidy structure helps you verify whether your chosen company is giving you accurate information — a common place where less scrupulous vendors mislead customers.
🎯 Current Subsidy Structure (Central Government)
• Systems up to 2 kW → ₹30,000 per kW
• 3rd kW (2kW–3kW range) → ₹18,000 per kW
• Systems above 3 kW → Capped at ₹78,000 total
Subsidy is transferred via Direct Benefit Transfer (DBT) to your bank account, typically within 30–60 days of commissioning and DISCOM inspection.
| System Size | Pre-Subsidy Cost (Est.) | Central Subsidy | Net Cost (Est.) | Monthly Gen. |
|---|---|---|---|---|
| 2 kW | ₹1,10,000–₹1,30,000 | ₹60,000 | ₹50,000–₹70,000 | 270–330 units |
| 3 kW | ₹1,55,000–₹1,80,000 | ₹78,000 | ₹77,000–₹1,02,000 | 400–480 units |
| 5 kW | ₹2,50,000–₹3,00,000 | ₹78,000 | ₹1,72,000–₹2,22,000 | 650–780 units |
| 10 kW | ₹5,00,000–₹6,50,000 | ₹78,000 | ₹4,22,000–₹5,72,000 | 1,300–1,560 units |
What Makes Thermosun the Right Solar EPC Partner for Delhi
Thermosun Engineering and Power India Pvt. Ltd. has spent years building a reputation as one of the most trusted names in rooftop solar installation across Delhi NCR — not through marketing claims, but through a track record that is verifiable and consistent. Here is what actually sets us apart:
✅ MNRE Approved & DISCOM Registered
Fully registered on pmsuryaghar.gov.in and with all three major Delhi DISCOMs — BSES Rajdhani, BSES Yamuna, and Tata Power-DDL. Subsidy processing is handled end-to-end.
🏗️ 1,000+ Successful Installations
From independent homes in South Delhi to large commercial complexes, Thermosun has completed over 1,000 solar installations across Delhi NCR with documented performance records.
🏛️ Government Project Credentials
Our team has delivered solar projects for Delhi Fire Stations, Tees Hazari Court, and Tihar Jail — credentials that speak to institutional-grade quality standards.
⚡ Tier-1 Components Only
We install panels and inverters exclusively from trusted brands — Adani Solar, Waaree, Vikram Solar, Luminous, and Polycab — all ALMM-listed and warranty-backed.
📋 Free, Detailed Site Survey
Every project begins with a professional on-site assessment covering shadow analysis, load calculation, and roof feasibility — completely free, no obligation to proceed.
📍 Local Delhi NCR Team
Our service team is based in Sheikh Sarai, New Delhi — meaning faster site visits, quicker response for after-sales issues, and no outsourced third-party support.
Frequently Asked Questions
Conclusion
Choosing the right solar EPC company in Delhi is as important as choosing the right system size. A quality installer who conducts a proper site survey, uses ALMM-listed components, handles your subsidy paperwork, and backs their work with genuine warranties will deliver a system that pays for itself in four to six years and reliably generates clean power for the next two decades. A poor choice can mean underperforming panels, missing subsidies, and no after-sales support when you need it most.
Use the 10-factor checklist in this guide with every vendor you evaluate — including Thermosun. We are confident in how we stand up to that scrutiny, which is exactly why we offer every new customer a free, no-obligation site survey before asking you to commit to anything.
☀️ Get a Free Site Survey from Thermosun
Thermosun Engineering and Power India Pvt. Ltd.
📍 1st Floor, D-2/208, Savitri Nagar, Savitri Nagar Village, Sheikh Sarai, New Delhi, Delhi 110017
📞 +91-8077914097 | +91-9999669347
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