What’s the 100 kW Solar Panel System Price in India in 2025? Subsidy and ROI Calculations Included

The 100 kW solar panel system price in India in 2025 for on-grid DCR subsidy projects ranges between ~Rs. 40,000* to ~Rs. 45,000* per kW + 13.8% GST, after you receive a subsidy. Simply put, a 100 kW on-grid solar panel system in India can cost you somewhere between ~Rs. 40 lakh* to ~Rs. 45 lakh* + 13.8% GST after you avail of a subsidy under the PM Surya Ghar Muft Bijli Yojana.

*Please note: The above-mentioned 100 kW solar system price list is indicative as of 28th August 2025 for the SolarSquare’s Blue 4-8ft variant. The final cost of rooftop solar for housing societies depends on your DISCOM charges, product variant opted for, panel type, inverter type, mounting structure height, type of after-sales service, savings guarantee, roof height, number of floors in your society, etc. Solar plate prices are subject to change. Also, DCR modules are made-in-India solar panels that are eligible for a subsidy. The final 100 kW solar system installation cost is much higher for non-DCR projects, as they’re not eligible for a subsidy.

Most housing societies in India opt for bifacial solar panels with mono-PERC half-cut solar PV cells because these modules are not only eligible for a subsidy but are also among the most efficient solar panels, capable of converting up to 22.5% of the sunlight they receive into solar electricity. 

The three main types of solar systems you’ll come across when exploring your options in India are on-grid solar systems, off-grid solar systems, and hybrid solar systems. Out of these, installing a 100 kW on-grid rooftop solar system is most beneficial for housing societies because it offers a stunning XIRR (rate of return) of 67% and can save ~Rs. 8,13,10,194* (eight crore, thirteen lakh, 10 thousand, one hundred, and 94 rupees) in its entire life.

*Please note: We’ve considered the plant annual degradation rate of 0.55% after the first year, the electricity tariff of Rs. 21 per unit, an annual tariff hike of 2%, and an insurance cost of 0.20% to calculate the lifetime savings from a 100 kW solar panel system.

In this blog, we’ll take you through the 100 kW solar system price list for all three types of solar systems, how the three types of systems differ, the eligibility criteria to avail a 100 kW solar system subsidy in India, and the 100 kW solar system installation cost in India vs the solar savings the plant will generate in 25 years of its life.

TL;DR Summary Box: 100 kW Solar System Price List in India in 2025

A 100 kW solar panel system, capable of generating 1.35 lakh* to 1.4 lakh* units of electricity annually, varies in cost based on whether it’s an on-grid system without lithium batteries or an off-grid or hybrid system with batteries. 

*Please note: The number of units generated by a 100 kW solar panel system listed above is indicative. The actual units generated can vary based on the pollution level in your city, peak sunshine hours your roof receives, shadows from surrounding objects, temperature and weather conditions in your city, tilt angle and efficiency of the solar panels used, inverter technology used, etc.

Let’s check out an overview of the 100 kW solar system installation cost in India for all three types:

*Please note: The above-mentioned 100 kW solar system price list is indicative as of 28th August 2025 for the SolarSquare’s Blue 4-8ft variant. The final 100 kW rooftop solar system price in India depends on your DISCOM charges, product variant opted for, panel type, inverter type, mounting structure height, type of after-sales service, savings guarantee, roof height, number of floors in your society, etc. The on-grid solar panel prices listed above are for DCR subsidy projects only. Also, SolarSquare does not install off-grid or hybrid solar systems. The prices for off-grid and hybrid PV systems mentioned above are based on standard market estimates.  

Here are the main topics we’ve covered in this blog in detail:

*Please note: The above-mentioned 100 kW solar panel system price in India for on-grid systems is indicative as of 28th August 2025 for the SolarSquare’s Blue 4-8ft variant. The final 100 kW rooftop solar system price in India depends on your DISCOM charges, product variant opted for, panel type, inverter type, mounting structure height, type of after-sales service, savings guarantee, roof height, number of floors in your society, etc. The on-grid solar panel prices listed above are for DCR subsidy projects only. Also, SolarSquare does not install off-grid or hybrid solar systems. The prices for off-grid and hybrid PV systems mentioned above are based on standard market estimates.  

**Please note: We’ve considered the plant annual degradation rate of 0.55% after the first year, the electricity tariff of Rs. 21 per unit, an annual tariff hike of 2%, and an insurance cost of 0.20% to calculate the lifetime savings from a 100 kW solar panel system.

What’s the 100 kW Solar Panel System Price in India with Subsidy?

The Indian government offers housing societies installing on-grid rooftop solar systems a subsidy under the PM Surya Ghar Muft Bijli Yojana when they opt for made-in-India DCR modules. The cost for 100 kW solar systems under DCR projects ranges between ~Rs. 40,000* to 45,000* per kW + 13.8% GST after a subsidy. 

Here’s the final 100 kW solar system installation cost in India in 2025 for all three types of solar systems, alongside details on how much subsidy is offered:

*Please note: The above-mentioned 100 kW solar panel system price in India for on-grid systems is indicative as of 28th August 2025 for the SolarSquare’s Blue 4-8ft variant. The final 100 kW rooftop solar system price in India depends on your DISCOM charges, product variant opted for, panel type, inverter type, mounting structure height, type of after-sales service, savings guarantee, roof height, number of floors in your society, etc. The on-grid solar plate prices listed above are for DCR subsidy projects only. Also, SolarSquare does not install off-grid or hybrid solar systems. The aforementioned 100 kW solar system price list for off-grid and hybrid systems is based on standard market estimates.  

What’s the 100 kW Solar System Subsidy in India?

Group housing societies receive a subsidy assistance of Rs. 18,000 per kW, up to 500 kW for common facilities under the PM Surya Ghar Muft Bijli Yojana. But, do all housing societies receive this financial help? No. Certain conditions must be met for housing societies to be considered eligible for the subsidy.  

Let’s check out the conditions that decide whether or not you’re eligible for the subsidy assistance offered by the central government:  

Group housing societies receive a subsidy only when the solar system is on-grid and is being installed on the rooftop for common area facilities. 

Here’s a tabulated snapshot of the amount of subsidy offered to housing societies for different capacity solar systems:

Please note: The subsidy for group housing societies in India is capped at Rs. 90 lakh. This means that any solar system for housing societies with a capacity above 500 kW will receive a fixed subsidy of Rs. 90 lakh. Commercial rooftop systems are not eligible for a subsidy. 

How to Apply for a 100 kW Solar System Subsidy in India?

The process for applying for and receiving a subsidy is straightforward. Visit the PM Surya Ghar Muft Bijli Yojana portal and follow the steps listed below:

• Step 1 – Access the national portal: Visit the PM Surya Ghar Muft Bijli Yojana Portal and click ‘Apply for Rooftop Solar’.
• Step 2 – Register your account: Select your state, district, and DISCOM. Then, enter your ‘Customer Account Number’.
• Step 3 – Complete installation form: Provide personal details (like your name and gender) and your latest electricity bill information.
• Step 4 – Upload required documents: Submit Proof of Identity, Proof of Ownership, and your most recent electricity bill.
• Step 5 – Submit bank details: After uploading the documents, enter your bank account information and upload a cancelled cheque on the portal.
• Step 6 – Choose an approved vendor: Select a DISCOM‑approved solar installer like SolarSquare to install rooftop solar at your housing society.
• Step 7 – Net meter installation: Once the installation is complete, your DISCOM will fit a bi-directional net meter to track imported and exported units.
• Step 8 – Obtain commissioning certificate: Your DISCOM issues a Solar Commissioning Certificate confirming the system is live.
• Step 9 – Apply for subsidy: Log back into your customer account on the portal and submit your Commissioning Certificate to claim the subsidy. 
• Step 10 – Receive subsidy: The approved subsidy amount is transferred to your bank account within 60 days of claim approval. 

100 kW Rooftop Solar System Price in India vs Lifetime Solar Savings With SolarSquare

A 100 kW on-grid solar system at SolarSquare that’ll cost you ~Rs. 44,02,100* will also pay back for itself in 1.5 years, offering an IRR of 67% and total savings of approximately ~Rs. 8,13,10,194* (eight crore, thirteen lakh, 10 thousand, one hundred, and 94 rupees) in 25 years. If you invest the same 44 lakh anywhere else, you won’t get 8 crore rupees in returns that a solar system with SolarSquare can offer you. 

*Please note: The above-mentioned 100 kW rooftop solar system price in India for DCR projects is indicative as of 28th August 2025 for the SolarSquare’s Blue 4-8ft variant. The final 100 kW solar system installation cost depends on your DISCOM charges, product variant opted for, panel type, inverter type, mounting structure height, type of after-sales service, savings guarantee, roof height, number of floors in your society, etc. Additionally, we’ve considered the annual plant degradation rate of 0.55% after the first year, an annual tariff hike of 2%, an electricity tariff of Rs. 21 per unit, and an insurance cost of 0.20% to calculate the lifetime savings from a 100 kW solar panel system. 

Here’s a simple table that forecasts your investment in a 100 kW solar panel system before and after a subsidy, and the savings that the same system will offer in 25 years of its life:

*Please note: The above-mentioned 100 kW rooftop solar system price in India for DCR projects is indicative as of 28th August 2025 for the SolarSquare’s Blue 4-8ft variant. The final 100 kW solar system installation cost depends on your DISCOM charges, product variant opted for, panel type, inverter type, mounting structure height, type of after-sales service, savings guarantee, roof height, number of floors in your society, etc. Additionally, we’ve considered the annual plant degradation rate of 0.55% after the first year, an annual tariff hike of 2%, an electricity tariff of Rs. 21 per unit, and an insurance cost of 0.20% to calculate the lifetime savings from a 100 kW solar panel system. 

Factors Affecting the 100 kW Solar Panel System Price in India in 2025

The final 100 kW solar panel system price in India is influenced by multiple factors, including the type of solar system being installed, the type of solar panels and solar inverters chosen, and even the height of the mounting structure. 

Let’s check out how these, and many other factors, decide how much you’ll finally pay for installing a 100 kW solar panel system in your housing society:

• Solar system types: Off-grid and hybrid solar systems are more expensive because they require the installation and maintenance of a lithium battery bank. Since batteries are not required for on-grid solar systems, they’re simpler to install and cost-effective.  
• Solar panel subsidy: If you choose non-DCR solar panels, you won’t get a subsidy of Rs. 18 lakh that housing societies installing DCR modules get for mounting an on-grid 100 kW solar panel system on their roofs. 
• Type of solar panels: Choosing high-efficiency bifacial solar panels may raise the upfront costs, but they also ensure higher electricity generation, which directly translates to more savings. 
• Type of solar inverter: Installing a solar inverter that follows the MPPT algorithm ensures your solar panels generate maximum output, regardless of sunlight conditions. But it also costs more.
• Height of the mounting structure: Taller solar mounting structures consume more material. This increases their cost and the final cost of the solar system.
• Number of floors in your society: The more floors your society has, the longer the cables and the complex the routing will be. This will increase the final 100 kW solar system installation price in India. 

What Are the Types of a 100 kW Solar System in India?

As you are now aware, the three primary types of solar systems are on-grid, off-grid, and hybrid. The reason an on-grid solar system is a better deal than the other two types is that it’s significantly more cost-effective. Additionally, it has the shortest payback period of ~1.5 years. 

Before we walk you through a head-on comparison between the three so you can choose the best option based on your needs, let’s give you an overview of how these three work:

• On-grid solar systems: Solar panels collect sunlight and convert it into direct current, which is then fed to a solar inverter that ultimately changes it into alternating current (AC). When the system generates more current, the excess goes to the grid through the bidirectional net meter. And when the panels aren’t generating current at night, the net meter imports electricity from the grid. Clearly, the grid plays a key role in on-grid solar systems.  
• Off-grid solar systems: Solar panels produce DC the same way as panels in on-grid systems do. The key difference here is that instead of a grid, the current is stored in a lithium battery bank. The solar inverter converts DC to AC to keep the load running during the daytime, and sends any excess current through a built-in MPPT charge controller to charge the batteries safely. The solar energy stored in the batteries is used at night.  
• Hybrid solar systems: These are the most expensive of the three types because they are connected to both the grid and the lithium battery bank, making them complex. The solar inverter first converts DC to AC to keep the load running during the day. Excess current is used to charge the lithium batteries through a built-in charge controller. If anything remains, it’s sent to the grid through a bi-directional net meter. The energy stored in the battery bank is used at night or whenever needed. 

Now that you know how the three work, let’s check out how they differ and why on-grid turns out to be better than off-grid and hybrid systems:

*Please note: The above-mentioned 100 kW rooftop solar system price in India for DCR projects is indicative as of 28th August 2025 for the SolarSquare’s Blue 4-8ft variant. The final 100 kW solar system installation cost depends on your DISCOM charges, product variant opted for, panel type, inverter type, mounting structure height, type of after-sales service, savings guarantee, roof height, number of floors in your society, etc. The on-grid solar plate prices listed above are for DCR subsidy projects only. Also, SolarSquare does not install off-grid or hybrid solar systems. The prices for off-grid and hybrid PV systems mentioned above are based on standard market estimates.  

100 kW On-Grid Solar System Specifications

Here’s a snapshot of the key specifications of a 100 kW on-grid solar system:

*Please note: The number of units generated by a 100 kW solar panel system listed above is indicative. The actual units generated can vary based on the pollution level in your city, peak sunshine hours your roof receives, shadows from surrounding objects, temperature and weather conditions in your city, tilt angle and efficiency of the solar panels used, inverter technology used, etc.

100 kW Off-Grid Solar System Specifications

Here’s a snapshot of the 100 kW off-grid solar system specifications:

*Please note: The number of units generated by a 100 kW solar panel system listed above is indicative. The actual units generated can vary based on the pollution level in your city, peak sunshine hours your roof receives, shadows from surrounding objects, temperature and weather conditions in your city, tilt angle and efficiency of the solar panels used, inverter technology used, etc.

100 kW Hybrid Solar System Specifications

Here’s a tabulated snapshot of the 100 kW hybrid solar system specifications:

*Please note: The number of units generated by a 100 kW solar panel system listed above is indicative. The actual units generated can vary based on the pollution level in your city, peak sunshine hours your roof receives, shadows from surrounding objects, temperature and weather conditions in your city, tilt angle and efficiency of the solar panels used, inverter technology used, etc.

What Are the Benefits of a 100 kW Solar Panel System?

A 100 kW solar panel system is equivalent to planting 3,920 full-grown trees that can offset 25,87,200 kg of carbon dioxide from the atmosphere in 25 years. Can you imagine how clean the air would become if all housing societies in your city switched to solar? However, that’s not the only reason you should consider installing a 100 kW solar panel system in India. 

Let’ s check out all the benefits of going solar:

• It can tackle the problem of air pollution in India: Respiratory illnesses are on the rise in India due to poor air quality. Deforestation only increases the problem. Installing rooftop solar is the simplest solution to combat climate change.  
• It will significantly reduce common area electricity bills: With 135,000* to 140,000* units of solar electricity being generated yearly, a 100 kW solar panel system will reduce your reliance on the grid. This will significantly reduce common area utility bills, as you can power common area loads, such as lifts, the gym, and swimming pools, using solar electricity produced by your rooftop solar system.

*Please note: The number of units generated by a 100 kW solar panel system listed above is indicative. The actual units generated can vary based on the pollution level in your city, peak sunshine hours your roof receives, shadows from surrounding objects, temperature and weather conditions in your city, tilt angle and efficiency of the solar panels used, inverter technology used, etc.

How Many Solar Panels Are in a 100 kW Solar System?

The number of solar panels required to design a 100 kW solar system depends on the size of the module you choose. For instance, if you go with SolarSquare’s 540Wp bifacial solar panels, you would need ~186 solar panels and ~10,000 square feet of shadow-free rooftop area to build a 100 kW solar panel system. 

Here’s the formula we’ve used to estimate the number of solar panels:

Based on this formula, let’s check out the actual calculation:

Ground-Mounted vs Rooftop Solar: Why’s On-Grid Rooftop Solar Better for Housing Societies?

A ground-mounted solar system is a significant land commitment, and it requires a substantial investment to purchase the land necessary for setting up a solar system. On the contrary, a rooftop solar system can be easily set up on an unused area of your rooftop. It makes rooftop solar more cost-effective. 

Here’s a head-on comparison between the two, proving why on-grid rooftop solar systems are better for housing societies: 

Why Choose SolarSquare to Install a 100 kW Solar Panel System?

SolarSquare is an MNRE-listed rooftop solar installation company. Our customers trust us because:

• We’re experienced solar installers: SolarSquare has already installed xyz MW of rooftop solar systems across India in abc housing societies. 
• We offer a 5-year AMC service plan: During this time, we take good care of your solar system’s overall health free of charge so it produces maximum electricity. 

Here’s a reference table for some of the housing societies that trusted us to install rooftop solar, and how the solar system is benefiting them:

Conclusion 

A 100 kW solar panel system price in India ranges between ~Rs. 40 lakh* to ~Rs. 45 lakh* + 13.8% GST for on-grid DCR projects post subsidy deduction. This investment looks minuscule compared to the 67% IRR that SolarSquare’s 100 kW solar system offers, saving ~Rs. 8,13,10,194* (eight crore, thirteen lakh, 10 thousand, one hundred, and 94 rupees) for your housing society in its entire life.

*Please note: The above-mentioned 100 kW solar system price list is indicative as of 28th August 2025 for the SolarSquare’s Blue 4-8ft variant. The final cost of rooftop solar for housing societies depends on your DISCOM charges, product variant opted for, panel type, inverter type, mounting structure height, type of after-sales service, savings guarantee, roof height, number of floors in your society, etc. Solar plate prices are subject to change. Additionally, we’ve considered the plant annual degradation rate of 0.55% after the first year, the electricity tariff of Rs. 21 per unit, an annual tariff hike of 2%, and an insurance cost of 0.20% to calculate the lifetime savings from a 100 kW solar panel system.

If you have any further questions, you can download our free solar handbook or book a free solar consultation call with our experts. 

Calculate your savings

Forecast your savings with solar on your investment on the SolarSquare’s plant

Pin code *

Please enter a valid pincode.

Oh! We haven’t reached your location yet

We are not yet servicable at your location but we will soon!

City

Avg electricity bill

Min. 500 Max ₹10,000

Calculate now