The Sriperumbudur–Oragadam corridor, about 40–55 km southwest of central Chennai in Kancheepuram district, is one of India's largest automotive and electronics manufacturing clusters. Hyundai, Renault, Daimler India Commercial Vehicles, Royal Enfield, India Yamaha Motor, Apollo Tyres, Foxconn and Saint-Gobain all have operations here, alongside hundreds of Tier-1 and Tier-2 suppliers and large logistics parks. Most of these plants are HT consumers with big metal roofs and heavy daytime loads, which makes them ideal for solar plants of 250 kW to several MW.
Why the Sriperumbudur–Oragadam belt suits large solar plants
- Large roofs: pre-engineered building (PEB) factory sheds and warehouses often have 50,000 sq ft to several lakh sq ft of unshaded metal roof.
- Heavy daytime load: press shops, machining lines, paint shops, moulding, SMT lines and compressed air run through the day, often in two or three shifts.
- HT tariffs: most plants are HT industrial consumers paying about ₹7.50 a unit, plus a 25% surcharge in peak hours, so every solar unit used on site is a direct saving.
- Supply-chain pressure: global OEMs and electronics brands increasingly ask suppliers about renewable energy use and emissions. A solar plant gives a measurable, auditable answer.
- Space beyond the roof: many plots have parking areas and spare land for carports or ground-mounted arrays.
Who solar works for in the corridor
| Type of unit | Typical plant size | Why it fits |
|---|---|---|
| Auto component suppliers (Tier-1 / Tier-2) | 250 kW–2 MW | Steady machining, press and paint loads; customer sustainability targets |
| Electronics and EMS units | 500 kW–several MW | Large clean-room and HVAC loads running through the day |
| Warehouses and logistics parks | 250 kW–several MW | Very large roofs; lighting, material handling and cold-chain loads |
| Tyre, rubber and plastics plants | 500 kW–several MW | High energy intensity; solar covers part of the daytime load |
| Building materials and process industries | 250 kW–1 MW+ | Continuous operations with high energy bills |
Rooftop, carport, ground-mount or open access?
Not sure whether to buy the plant or pay per unit? Compare the options in our guide to zero-investment solar for factories (RESCO / OPEX).
Solar plant cost, generation and savings: 250 kW to 1 MW
| Plant size | Approximate cost | Units per year | Annual saving at ₹7.50 (HT I) | Metal roof needed |
|---|---|---|---|---|
| 250 kW | ₹75 lakh–1.25 crore | ~3,62,500 | ~₹27 lakh | 20,000–25,000 sq ft |
| 500 kW | ₹1.5–2.5 crore | ~7,25,000 | ~₹54 lakh | 40,000–50,000 sq ft |
| 750 kW | ₹2.25–3.75 crore | ~10,87,500 | ~₹82 lakh | 60,000–75,000 sq ft |
| 1 MW | ₹3–5 crore | ~14,50,000 | ~₹1.09 crore | 80,000–1,00,000 sq ft |
Figures assume about 1,450 units per kW per year with all power used on site, and are year-one estimates before panel degradation, tariff revisions and any applicable network charges. Payback is typically 3–4.5 years, and shorter with 40% accelerated depreciation. For a smaller plant, see our breakdown of 100 kW solar plant cost in Chennai.
How solar affects an HT electricity bill
- Energy charges fall: every solar unit consumed on site replaces a grid unit at about ₹7.50 (HT I industrial).
- Peak-hour savings: HT consumers pay a 25% surcharge from 6–10 am and 6–10 pm. Solar generation from about 7–10 am offsets some of the morning peak units at the higher rate.
- Demand charges stay: the demand charge of about ₹608 per kVA is based on your contracted or recorded demand, which solar does not reliably reduce, because a cloudy day still sets your peak.
- Night rebate unaffected: the 5% night-time rebate continues to apply to night consumption.
- Capacity limits: TNERC rules limit rooftop capacity per service connection and set the metering arrangement. Your EPC company should confirm the limits for your HT service before sizing the plant.
The EPC process for a large plant
12 months of HT bills, 15-minute load data where available, shift patterns and planned expansions.
Roof and purlin condition, sheet type and age, skylights, ventilators, fire-safety walkways, and space for inverters and transformers.
Layout, single-line diagram, cable and protection design, generation simulation, and integration with your HT substation and LT panels.
TNPDCL application, Chief Electrical Inspectorate approval, metering, and coordination with your landlord or park operator where needed.
Work planned around production, with safety permits, roof-access systems and a tie-in during a planned shutdown.
Scheduled cleaning, preventive maintenance, inverter and string monitoring, and monthly generation reports for your sustainability reporting.
Things to plan for in the corridor
- Leased warehouses and sheds: many logistics and supplier units are leased. Agree with the landlord on roof access, who owns the plant, and what happens when the lease ends.
- Roof warranties: new PEB roofs often carry manufacturer warranties. Use approved clamps and fixing methods so the warranty stays valid.
- Fire safety and walkways: large plants need fire-access pathways, DC isolation and roof safety lines, which customers' EHS teams and insurers increasingly ask for.
- Dust from construction and traffic: the corridor is still growing, so plan for more frequent panel cleaning and a reliable water supply on the roof.
- Wind design: Chennai's region has a 50 m/s basic wind speed. Structures and clamps must be designed for it. See solar in Chennai's monsoon and cyclones.
- Data for reporting: make sure monitoring gives you exportable generation data for customer audits and sustainability reports.
We serve industrial units across Sriperumbudur, Irungattukottai, Oragadam, Vallam Vadagal, Pillaipakkam, Mannur, Sunguvarchatram and Padappai. For units elsewhere in Chennai, see solar EPC for Ambattur Industrial Estate and solar for factories in Chennai. To compare contractors, read our guide to the top solar EPC companies in Chennai.
Frequently asked questions
How much does a 1 MW solar plant cost in Sriperumbudur or Oragadam?
About ₹3–5 crore in 2026, depending on whether it is rooftop, carport or ground-mounted, the structure, and the equipment specification. Rooftop plants on metal sheds are usually at the lower end.
How much can a factory in Oragadam save with solar?
At the HT industrial energy charge of about ₹7.50 a unit, each kW of solar saves roughly ₹10,900 a year. A 500 kW plant saves about ₹54 lakh a year and a 1 MW plant about ₹1.09 crore, when the power is used on site.
Does solar reduce HT demand charges?
Not reliably. Demand charges depend on your contracted or recorded maximum demand, which can still occur on a cloudy day or outside solar hours. Solar mainly reduces energy charges, including some peak-hour units in the morning.
Can solar be installed on a leased warehouse roof?
Yes, with the landlord's written consent. Agree in advance on roof access, ownership of the plant, roof warranty, and what happens at the end of the lease. RESCO models are often used for leased buildings.
How much roof space does a 1 MW rooftop plant need?
About 80,000–1,00,000 sq ft of unshaded metal roof, or more on RCC roofs with elevated structures.
How long does a 1 MW plant take to install?
Typically about 8–12 weeks of site work after materials arrive, plus time for TNPDCL and Electrical Inspectorate approvals and metering.
Do you serve SIPCOT Irungattukottai and Vallam Vadagal?
Yes. Arka Solar Energy serves industrial units across Sriperumbudur, Irungattukottai, Oragadam, Vallam Vadagal, Pillaipakkam and nearby areas from our Chennai office.
Planning solar for a plant in Sriperumbudur or Oragadam?
Arka Solar Energy is a solar EPC company in Chennai. Share your HT bills and site details, and we'll send a plant design, generation estimate and payback model, with CAPEX and RESCO options compared.
Costs, tariffs and savings are indicative as of November 2026 and vary by site, plant size, equipment and tariff category. Tamil Nadu tariffs, capacity limits and open access charges are set by TNERC and may change. Company names are mentioned only to describe the area and do not imply any relationship with Arka Solar Energy. Consult your chartered accountant on depreciation and tax treatment.