PM Surya Ghar Muft Bijli Yojana: Solar Rooftop Subsidy, Net Metering & ROI Guide (2026)

Q: What is the rooftop area required for a 3 kW solar plant?

Each 1 kW of solar capacity requires approximately 80 to 100 square feet of shadow-free rooftop area. A 3 kW installation requires around 250 to 300 square feet of unobstructed space facing south.

1. What is PM Surya Ghar: Muft Bijli Yojana?

With electricity tariffs climbing steadily across Indian states (averaging ₹7 to ₹12 per unit in the higher telescopic slabs of MSEDCL, BESCOM, TNEB, and UPPCL), rooftop solar is no longer an environmental novelty—it is one of the highest-return domestic financial investments available in India today.

To accelerate residential clean power adoption, the Government of India launched the landmark PM Surya Ghar: Muft Bijli Yojana with a massive national budget of ₹75,021 Crore.

The scheme aims to empower 1 Crore (10 million) Indian households with rooftop solar plants, providing up to 300 units of free green electricity every month. The government has radically simplified the process: you choose an empanelled vendor, install the system, get net-metered by your local DISCOM, and receive the subsidy credited directly into your Aadhaar-linked bank account within 30 days!

2. Central Financial Assistance (CFA) Subsidy Slabs in 2026

The Ministry of New and Renewable Energy (MNRE) standardized the subsidy structure to ensure transparency and eliminate vendor markups. The subsidy is structured into clear capacity tiers:

Rooftop Solar Capacity	Government Subsidy (CFA)	Avg Monthly Generation	Recommended For
1 kW System	₹30,000	120 – 135 Units (kWh)	Bachelors / 1-2 BHK with no AC
2 kW System	₹60,000	240 – 270 Units (kWh)	2-3 BHK home with 1 Refrigerator + Fans + TV
3 kW System	₹78,000 (Maximum Cap)	360 – 420 Units (kWh)	Family home with 1–2 Inverter ACs (Most Popular)
Above 3 kW (Up to 10 kW)	₹78,000 (Fixed Cap)	480 – 1,400 Units (kWh)	Large villas, joint families, EV owners
Group Housing (GHS / RWA)	₹18,000 per kW (Up to 500 kW)	Varies by common area	Apartment lifts, water pumps & common lighting

State-Specific Extra Subsidies:

Certain progressive states provide additional top-up subsidies over and above the ₹78,000 central subsidy! For example, Uttar Pradesh (UPNEDA) offers up to ₹30,000 additional state subsidy, and Delhi/Gujarat provide supplementary generation credits, bringing total savings even higher.

3. System Sizing: How Many kW Does Your Home Actually Need?

Choosing the right rooftop solar system capacity depends on two primary constraints: your Monthly Unit Consumption and your Available Shadow-Free Rooftop Area.

// The Solar Generation Benchmark:

1 kW Capacity ≈ 4 to 4.5 Units (kWh) / Sunny Day in India

Annual Yield ≈ 1,400 to 1,500 Units (kWh) per 1 kW installed

Rooftop Area Requirement:

Modern high-efficiency Mono PERC or TOPCon Bifacial panels (typically 540W to 580W per panel) require approximately 80 to 100 square feet of shadow-free area per 1 kW.
A 3 kW plant requires approximately 250 to 300 sq. ft. of unobstructed south-facing terrace area.
If you have tall parapets, overhead water tanks, or neighboring buildings casting shade between 9:00 AM and 4:00 PM, elevated galvanized iron (GI) structures can be fabricated to clear obstacles.

4. The Economics: Complete Cost, Subsidy & Payback Calculation

Let's analyze the exact real-world financials for India's most popular residential installation: a 3 kW On-Grid Rooftop Solar Plant:

Financial Parameter	1 kW System	2 kW System	3 kW System (Sweet Spot)
Estimated Gross System Cost	₹65,000 – ₹75,000	₹1,25,000 – ₹1,40,000	₹1,80,000 – ₹2,00,000
PM Surya Ghar Subsidy (DBT)	- ₹30,000	- ₹60,000	- ₹78,000
Net Out-of-Pocket Cost	₹35,000 – ₹45,000	₹65,000 – ₹80,000	₹1,02,000 – ₹1,22,000
Annual Electricity Generated	~1,440 Units	~2,880 Units	~4,320 Units
Annual Bill Savings (@₹8.00/unit avg)	₹11,520 / year	₹23,040 / year	₹34,560 / year
Complete Payback Period (ROI)	~3.2 Years	~3.0 Years	~2.9 to 3.5 Years
25-Year Cumulative Savings	₹2,80,000+	₹5,60,000+	₹8,40,000+

The Financial Reality: Where else in India can you legally achieve a 30% to 35% tax-free annualized return on capital? After the ~3-year payback milestone, the remaining 21+ years of warranty represent pure financial profit with virtually zero monthly electricity bills!

5. How Net Metering Works with Your State DISCOM

The backbone of residential solar economics is the Bi-Directional Net Meter installed by your electricity distribution company (DISCOM):

During the Day (9:00 AM – 4:00 PM): Your solar panels generate peak power. Your home uses what it needs (fans, fridge, AC); any surplus power is automatically sent (exported) into the electricity grid. The meter records these exported units.
During the Night (6:00 PM – 6:00 AM): Solar generation stops. Your home draws (imports) electricity from the grid as usual.
The Monthly Bill Calculation:
Billed Units = Gross Imported Units − Total Exported Solar Units
Banking & Roll-Over: If you generated 420 units and only consumed 350 units, the surplus 70 units are credited into your solar bank and rolled over to the next month (saving you money during cloudy monsoon weeks).

6. Step-by-Step Guide: How to Apply on National Portal (pmsuryaghar.gov.in)

Portal Registration

Visit the official government portal at pmsuryaghar.gov.in. Select your State and Electricity Distribution Company (DISCOM), and enter your Consumer Account Number found on your monthly bill.

Apply for Technical Feasibility Approval (TFR)

Submit the online application specifying your sanctioned load and desired solar plant capacity (e.g. 3 kW). The DISCOM verifies your local transformer capacity and issues technical feasibility approval online.

Installation by Empanelled Vendor

Select any registered vendor from the portal's vendor directory. The vendor executes the physical installation using ALMM-approved Made-in-India solar modules, an on-grid string inverter, lightning arresters, and earthing pits.

Net Meter Installation & Commissioning

The vendor submits the completion report on the portal. The DISCOM inspection team visits your premises, installs the bi-directional net meter, and issues a formal Commissioning Certificate.

Direct Subsidy Credit to Your Bank

Submit your bank account details and upload a cancelled cheque on the portal. Within 30 days of commissioning, the ₹78,000 central subsidy is deposited directly into your bank account!

7. Top 4 Mistakes to Avoid When Installing Rooftop Solar

Mistake 1: Choosing Non-DCR / Non-ALMM Panels: Under government rules, to qualify for the PM Surya Ghar subsidy, the solar cells and modules must be manufactured in India (Domestic Content Requirement - DCR) and listed on the approved ALMM list. Imported cheap panels do NOT receive any subsidy.
Mistake 2: Neglecting Earthing and Surge Protection: Rooftop solar is exposed to lightning strikes and grid voltage surges. Always insist on separate chemical earthing pits (one for AC, one for DC, and one for the lightning arrester).
Mistake 3: Forgetting Panel Cleaning Access: Dust, bird droppings, and pollution reduce solar output by 15% to 25%. Ensure your vendor leaves walkways so you can wipe the panels with plain water once every 10 to 15 days.
Mistake 4: Oversizing Beyond Sanctioned Load: Most state DISCOMs mandate that your solar rooftop capacity cannot exceed your sanctioned connected load (e.g. if your sanctioned load is 3 kW, you cannot install a 5 kW plant without first paying for an official load extension).

Interactive Energy Tool

Size Your Home Solar System Accurately

Calculate your exact household appliance consumption, figure out how many units your home consumes every month, and determine whether a 2 kW or 3 kW solar plant is ideal for your roof!

Open BT Energy Calculator Check State DISCOM Slabs

8. Frequently Asked Questions (FAQs)

What is the maximum central subsidy under PM Surya Ghar Muft Bijli Yojana?

Under the PM Surya Ghar scheme, the Central Government provides a direct financial subsidy of ₹30,000 for a 1 kW system, ₹60,000 for a 2 kW system, and a maximum capped subsidy of ₹78,000 for systems of 3 kW capacity and above for residential individual homes.

How many units of electricity does a 3 kW solar rooftop system generate per day in India?

A standard 3 kW on-grid solar rooftop system installed with south-facing mono PERC / TOPCon panels generates approximately 12 to 14 units (kWh) of electricity per day in typical sunny Indian conditions. Over a month, it generates 360 to 420 units, and over a year, it yields approximately 4,200 to 4,500 units.

How does net metering work on my electricity bill?

A bi-directional net meter records both electricity imported from the DISCOM grid (at night or cloudy days) and electricity exported to the grid (during peak sunny hours). Your monthly bill is calculated strictly on Net Units = (Imported Units − Exported Units). If you export more than you import, surplus units roll over to subsequent billing cycles or are settled annually at the approved feed-in tariff.

What is the rooftop area required for a 3 kW solar plant?

Each 1 kW of solar capacity requires approximately 80 to 100 square feet of shadow-free rooftop area. A 3 kW installation requires around 250 to 300 square feet of unobstructed space facing south.

What is the payback period and lifespan of a residential rooftop solar system?

After factoring in the ₹78,000 PM Surya Ghar subsidy, the net out-of-pocket investment for a 3 kW system is approximately ₹1,00,000 to ₹1,20,000. Generating ~4,300 units per year at an average slab tariff of ₹8.00/unit saves ~₹34,400 annually, yielding a complete payback period of just 2.8 to 3.5 years. Solar panels carry a 25-year performance warranty, offering over 21 years of completely free electricity.

Explore More Appliance & Energy Guides:

State Tariffs