100 kW Solar System: Price in India with Subsidy, Installation Cost, Specifications & More (2025 Guide)
With rising electricity costs and growing energy needs, large-scale solar power systems are becoming the first choice for industries, schools, hospitals, and commercial buildings. Among them, a 100 kW solar system is one of the most popular and cost-effective solutions for medium to large power requirements in India.
In this blog, we will explain the price, subsidy, installation cost, specifications, benefits, and uses of a 100 kW solar power plant in India (2025).
🔆 What is a 100 kW Solar System?
A 100 kW solar system is a large solar power plant that can generate around 400–450 units of electricity per day on average. That means 1.2 to 1.5 lakh units annually, depending on sunlight conditions.
It is mainly used for:
- Factories & warehouses
- Educational institutions (schools, colleges, universities)
- Hospitals and healthcare centers
- Hotels and commercial complexes
- Large offices and corporate buildings
💰 100 kW Solar System Price in India (2025)
The price of a 100 kW solar system depends on the type of system:
| Type of Solar System | Price Range (Approx.) | Best For |
|---|---|---|
| On-Grid Solar System | ₹45 – ₹55 lakh | Industries, schools, commercial use |
| Off-Grid Solar System | ₹65 – ₹75 lakh | Remote areas, backup requirement |
| Hybrid Solar System | ₹70 – ₹85 lakh | Places needing both grid + battery backup |
💡 Note: Prices vary based on brand, location, quality of panels, and installation costs.
🏷 Government Subsidy on 100 kW Solar Plant (2025)
For larger systems like 100 kW, government subsidies are usually not provided under residential schemes.
- Residential rooftop solar subsidy is available up to 10 kW.
- 100 kW systems fall under commercial/industrial projects, where subsidies are not given.
- However, you can get tax benefits, accelerated depreciation (up to 40%), and net metering advantages which significantly reduce the payback period.
⚡ Electricity Generation of 100 kW Solar System
- Daily Generation: 400–450 units per day
- Monthly Generation: 12,000–13,500 units per month
- Yearly Generation: 1.4–1.6 lakh units per year
👉 With this, a company can save up to ₹10–15 lakh per year on electricity bills.
🛠 Installation Cost of 100 kW Solar System
The installation cost covers:
- Solar panels (70–75% of cost)
- Inverter system (10–15% of cost)
- Batteries (if off-grid/hybrid)
- Mounting structures
- Wiring, cabling, net metering, labor & approvals
On average, installation adds ₹5–7 lakh extra to the system price.
📐 Specifications of 100 kW Solar System
Here’s an overview of the technical details:
- Capacity: 100 kW (100,000 watts)
- Solar Panels Required: 250–300 panels (400W–450W each)
- Area Required: 8,000–10,000 sq. ft. (open roof/ground)
- Inverter Size: 100 kW or multiple smaller inverters combined
- Battery (for off-grid/hybrid): 800–1000 Ah (depending on backup need)
- Lifespan: 25+ years for panels, 10–12 years for inverters/batteries
✅ Benefits of 100 kW Solar Power Plant
- Huge Savings: Reduces electricity bills by up to 80–90%.
- Fast ROI: Payback in 4–6 years.
- Green Energy: Reduces 120–150 tons of CO₂ emissions annually.
- Energy Independence: Less dependence on grid power.
- Net Metering: Earn from selling excess power back to DISCOM.
- Low Maintenance: Requires only cleaning and basic servicing.
- Long Lifespan: Panels last 25 years or more.
🔧 Uses of 100 kW Solar System
- Running industrial machines and factory operations
- Powering air conditioners, elevators, and large equipment in offices
- Operating medical equipment & cooling systems in hospitals
- Lighting and powering schools, colleges & hostels
- Supporting commercial complexes, hotels & malls
📊 Payback Period of 100 kW Solar Plant in India
- Investment: ₹45–75 lakh (depending on type)
- Annual Savings: ₹10–15 lakh
- Payback Time: 4–6 years
- System Life: 25+ years
This makes it a profitable long-term investment for businesses.
📝 Conclusion
A 100 kW solar system is an excellent choice for industries, schools, hospitals, and commercial spaces in India. While subsidies are not available for such large plants, tax benefits, accelerated depreciation, and net metering make them highly cost-effective. With proper installation and maintenance, you can save lakhs of rupees every year and contribute to a sustainable future.
❓ FAQs on 100 kW Solar Power Plant
Q1. How much does a 100 kW solar system cost in India?
A 100 kW solar system costs between ₹45 lakh to ₹85 lakh, depending on the type (on-grid, off-grid, hybrid).
Q2. How much area is required for a 100 kW solar system?
It needs around 8,000–10,000 sq. ft. of shadow-free rooftop or land.
Q3. Does the government provide subsidy for 100 kW solar system?
No subsidy is available, but tax benefits & net metering make it profitable.
Q4. How many units does a 100 kW solar system generate per day?
On average, it generates 400–450 units/day.
Q5. Is 100 kW solar system suitable for residential use?
No, it is mainly for industrial, commercial & institutional use.