What is EPC in Solar Energy? A Complete Guide for B2B Companies
Procurement teams, project developers, and B2B suppliers need to understand Engineering, Procurement & Construction contracts.
What is EPC in Solar Energy?
EPC stands for Engineering, Procurement, and Construction. It is the most comprehensive contract model for building large solar power plants in India.
For B2B companies EPC contractors are your primary customers.
"In the Indian solar market, winning an EPC contract worth ₹100 Cr to ₹1,200 Cr is not uncommon."
The EPC model transfers project risk from the buyer to the EPC contractor.
The Three Phases of an EPC Contract
Every EPC contract is structured around three core phases.
Design & Technical Planning
The EPC contractor develops detailed engineering drawings.
Sourcing Equipment & Materials
All materials are delivered to the site.
Installation & Commissioning
The plant is tested and handed over.
Engineering Phase
Engineering is the foundation of the entire project.
Vendors who engage with EPC contractors during the Engineering phase win more deals.
Procurement Phase
This is the highest-value phase for B2B suppliers.
Approach EPC contractors 6–12 months in advance.
Construction Phase
During construction the EPC contractor manages civil work, mechanical installation, and electrical work.
On-time delivery determines repeat orders.
EPC vs Other Solar Contract Models
Not all solar projects are pure EPC contracts.
| Model | Who Pays? | Owns the Plant? | Revenue Model | B2B Impact |
|---|---|---|---|---|
| EPC (Fixed Price) | Buyer | Buyer | Lump-sum + O&M | High volume |
| RESCO | Developer | Developer | Per-unit tariff | Developer sets spec |
| BOOT | Developer | Developer → Buyer | Tariff | Long-term relationship |
| O&M Only | N/A | Buyer | Annual maintenance | Spares only |
| BOS Package | Prime EPC | Buyer | Subcontract | Component level |
BOS refers to all components other than the panels.
Who are EPC Contractors in the Indian Solar Market?
EPC contractors range from large PSUs to mid-sized private companies.
PSU EPC Contractors
NTPC, BHEL, Bridge & Roof, ONGC, Coal India execute solar projects for government entities.
Private EPC Contractors
Kosol Energie, GHV India, Phaloudi Constructions are more agile in procurement.
Subcontract EPC
In larger projects the primary contractor subcontracts BOS to associate firms.
Major Solar EPC Buyers in India
EPC contractors are given projects by awarding authorities.
One of the largest solar project developers in India.
Recently awarded ₹1,217 Cr EPC contract for 300 MW solar.
Procures floating and ground-mounted solar.
Executes EPC projects and subcontracts.
One of the most active solar procurement bodies in Gujarat.
Award rooftop solar EPC contracts in ₹1–5 Cr range.
How a Solar EPC Project Works
Understanding the full project lifecycle is important.
Stage 1: Tender Issue
The awarding authority publishes tenders on GEM portal.
Stage 2: Technical Bid Opening
EPC contractors submit their technical bids.
Stage 3: Financial Bid and Award
AOC is issued.
Stage 4: Procurement and Mobilization
The EPC contractor begins issuing RFQs and purchase orders.
Stage 5: Construction and Installation
Civil work, mechanical and electrical work progress.
Stage 6: Testing, Commissioning and Handover
The plant undergoes performance ratio testing.
EPC contractors face LDs.
Materials & Components in a Solar EPC Project
An EPC project is only as good as the components that go into it.
Solar Panels
Mono-PERC panels in 550–575 Wp range are dominant specs.
Mounting Structure
HDG steel mounting structures are standard.
Inverters
String and Central inverters are used.
- ✓DC solar cables (flame-retardant, UV-resistant, TUV-certified)
- ✓AC armoured cables
- ✓Array junction boxes (AJB)
- ✓DCDB and ACDB
- ✓Earthing kits
- ✓Lightning arrestors
- ✓Cable trays
- ✓RCC pedestal foundations
- ✓Module cleaning systems
- ✓RMS
- ✓Safety signage and PPE kits
O&M: Life After EPC
O&M is increasingly bundled with EPC contracts.
Types of O&M contracts
Most common O&M structures are:
Comprehensive O&M (CAMC): responsible for all aspects.
AMC: labour covered, spare parts separate.
Long-term O&M: PM-KUSUM 25-year tariff.
O&M Duration
1 year to 7 years.
Every commissioned plant creates sustained demand.
B2B Opportunities in Solar EPC Projects
The solar EPC market in India creates opportunities across various categories.
| Company Type | Where You Fit | Key Buyers | Deal Range |
|---|---|---|---|
| Solar panel manufacturer | Procurement phase | EPC contractors, BOS subcontractors | ₹5 Cr – ₹500 Cr+ |
| Mounting structure | Procurement & construction | EPC contractors | ₹50 L – ₹80 Cr |
| Inverters | Procurement phase | EPC, RESCO | ₹30 L – ₹50 Cr |
| Cables | Procurement phase | EPC contractors | ₹20 L – ₹30 Cr |
| Civil contractor | Construction phase | EPC prime | ₹1 Cr – ₹40 Cr |
| Electrical contractor | Construction phase | EPC prime | ₹50 L – ₹20 Cr |
| O&M service | Post-commissioning | Plant owners | ₹30 L – ₹5 Cr/year |
| RMS software | Procurement & O&M | EPC, operators | ₹5 L – ₹2 Cr |
How to Win B2B Business from Solar EPC Contractors
Understanding EPC is one thing, getting orders is another.
1. Track tender awards
Award data has the most valuable intelligence.
2. Use GEM portal
Build a weekly review process.
3. Get ALMM-listed
Non-ALMM panels are ineligible.
4. Offer technical support
Vendors who reduce risk win repeat business.
5. Build relationships first
Approach 6–12 months before tenders.
Start with Gujarat and Rajasthan.
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