In India, rooftop solar is a system of photovoltaic panels fixed on the roof of a home, school, factory or office that turns sunlight directly into electricity for use on the spot, with any surplus flowing into the public grid. For a country that receives strong sunshine across most of the year, it is among the simplest ways to cut electricity bills, reduce dependence on coal-based power and bring generation close to where electricity is actually consumed.
This explainer covers how rooftop solar works, what it costs and yields, how net metering pays households for extra power, and what the PM Surya Ghar Muft Bijli Yojana, the central scheme aimed at putting solar on a crore homes, actually offers. It also looks honestly at the hurdles, from upfront cost and roof space to the worries of power distribution companies. Last updated: 3 November 2026.
| What it is | Solar photovoltaic panels on rooftops that generate electricity for the building and the grid |
|---|---|
| Typical home system | Commonly 2 to 3 kilowatts (kW), needing roughly 10 square metres of shadow-free roof per kW |
| Typical output | About 4 units (kWh) per kW per day on average, varying with season, location and cleaning |
| Panel life | Around 25 years, with the inverter usually replaced once in that period |
| Key scheme | PM Surya Ghar Muft Bijli Yojana, launched in February 2024, targeting one crore households |
| Subsidy structure | Central support of up to about Rs 78,000 for a 3 kW home system, with extra state incentives in some places |
| Billing method | Net metering or net billing credits exported power against power drawn from the grid |
| Main hurdles | Upfront cost, roof ownership and shade, approvals, discom concerns and module quality |
Key Takeaways
- Rooftop solar generates electricity from sunlight on a building’s own roof, usually cutting the grid power the household must buy and earning credit for any surplus.
- A typical 3 kW home system produces enough in a year to cover the needs of many middle-class households, and panels are designed to last about 25 years.
- Under net metering, exported units are credited against imported units, so the household pays only for the net difference on its meter reading.
- The PM Surya Ghar Muft Bijli Yojana offers central financial assistance and cheap loans so that eligible homes can install rooftop solar, with the aim of up to 300 units of free power a month for many families.
- The main barriers are upfront cost, unsuitable or shared roofs, slow approvals, patchy vendor quality and the financial worries of power distribution companies.
- Rooftop solar helps climate goals by displacing coal power, but its success depends on good installation, honest vendors, grid readiness and fair tariffs.
What is rooftop solar and how does it work?
Rooftop solar works by using photovoltaic cells in panels to convert sunlight into direct current electricity, which an inverter then changes into the alternating current used by household appliances and the grid. The panels contain silicon cells that release electrons when light strikes them, and no fuel is burnt, no water is consumed in generation and there are almost no moving parts.
A complete system has four main parts. The panels, usually mounted on metal frames facing south at a tilt close to the local latitude, capture the light. The inverter converts and manages the power. A meter, or a pair of meters, records what the household draws from and sends back to the grid. And in some cases, a battery stores energy for use after sunset. Cabling, earthing and surge protection complete the setup, and good installers also fit lightning arresters and a safe isolation switch for maintenance.
There are three common configurations. An on-grid system is tied to the utility network, has no battery, and shuts down automatically if the grid fails, to protect line workers. An off-grid system uses batteries and does not depend on the grid, which suits remote homes and farms but costs more. A hybrid system combines both and keeps essential loads running during outages. Most urban rooftop installations in India are on-grid because they are cheaper and pair neatly with net metering.
How much does rooftop solar cost and how much power does it produce?
A rooftop solar system for a home typically costs roughly Rs 50,000 to Rs 75,000 per kilowatt before subsidy, and each kilowatt produces about four units of electricity a day on average, though prices and yields vary by city, brand, roof type and market conditions. A 3 kW system, a common size for a family, is therefore often quoted at somewhere around Rs 1.5 lakh to Rs 2.25 lakh before any subsidy.
Yield depends on sunshine. Rajasthan, Gujarat and parts of central and southern India receive some of the strongest and steadiest sunlight, while the Himalayan foothills, the north-east and the monsoon-drenched coast get less over the year. Even so, a 3 kW system can plausibly generate around 360 units a month in a sunny region, with dips in the monsoon and a boost in the dry spring months. Dust, bird droppings, shade from a water tank or neighbouring building, and panel angle all trim output, so periodic cleaning matters.
The quick arithmetic of savings is straightforward. Every unit generated and used on site is a unit not bought from the discom at its tariff, which for many households is a few rupees per unit and higher in upper slabs. After subsidy, many households recover their outlay within a handful of years and then enjoy power at very low marginal cost for the remaining life of the panels. Because the panels are warrantied for around 25 years while the inverter may need replacing once, buyers should budget for that replacement, and should compare quotes on the basis of lifetime cost rather than headline price alone.
What is net metering and how does it work in India?
Net metering is a billing arrangement in which the electricity a rooftop solar system sends to the grid is credited against the electricity the household takes from it, so the consumer pays only for the net difference. A bidirectional meter counts units in both directions, and in the daytime a solar home often exports its surplus, while at night it draws power back from the grid.
At the end of the billing cycle the discom subtracts exports from imports. If imports exceed exports, the household pays for the balance at its normal tariff, and if exports exceed imports the extra units are usually carried forward as credit to the next cycle. Many states settle any leftover credit at the end of the financial year at a rate set by the regulator, which is typically lower than the retail tariff. The detailed rules vary by state, since electricity is a concurrent subject and each state regulatory commission frames its own regulations within the national framework.
Central rules issued under the Electricity Act framework entitle consumers to install rooftop solar and set timelines for approvals and meter installation, with net metering available up to a stated size related to the sanctioned load. Some states have moved toward net billing or gross metering, where exports are paid for at a fixed rate rather than offset one-to-one. For households, the key practical point is to check the local rules before installing, since the value of exported power can differ widely between net metering and other models.
What is the PM Surya Ghar Muft Bijli Yojana?
The PM Surya Ghar Muft Bijli Yojana is a central government scheme, announced in early 2024, that aims to install rooftop solar on one crore households by the 2026-27 financial year, offering subsidies and low-interest loans so that families can generate much of their own power. The name translates roughly as the Prime Minister’s Solar Home Free Electricity Scheme, and its headline promise is up to 300 units of free electricity a month for many participating households.
The scheme is run through a national online portal where a household registers, picks an approved vendor, gets the installation inspected and commissioned, and receives the subsidy directly in a bank account. It has a large budget outlay running into tens of thousands of crores of rupees and is designed to reach not only affluent urban homes but also lower-income families through concessional finance and the involvement of discoms and local bodies. The scheme also ties in with domestic manufacturing, and subsidised systems are expected to use modules made in India, which supports local industry.
It is worth being precise about what “free” means. The electricity is not delivered free by the government; rather, a household with a suitably sized system generates its own power, uses it, and bills fall sharply or to near zero, with surplus sold back to the discom. The promise of 300 free units therefore depends on the size of the system, the sunshine at the site and the household’s consumption. Reported savings to households are an estimated benefit, not a guaranteed sum.
How much subsidy does a household get under PM Surya Ghar?
A household installing a rooftop solar system under PM Surya Ghar receives central financial assistance of about Rs 30,000 per kilowatt for the first two kilowatts and Rs 18,000 for the third kilowatt, capped at about Rs 78,000 for systems of three kilowatts or more. The support is paid after the system is installed and verified, and some states add their own top-up incentives on top of the central amount.
| System size | Central assistance | Notes |
|---|---|---|
| 1 kW | About Rs 30,000 | Suits small homes with low consumption |
| 2 kW | About Rs 60,000 | Common for modest households |
| 3 kW or more | About Rs 78,000 (cap) | No further central support beyond 3 kW |
| Housing societies, common facilities | Lower per-kW support for shared loads | Applies to common-area power such as lifts and lighting |
The scheme also links households to collateral-free loans from banks at concessional interest rates, so that the gap between the subsidy and the full cost can be financed and repaid out of the electricity savings. Residents of apartment complexes can benefit through residents’ welfare associations, which can install solar to run common services like lifts, pumps and corridor lights. Figures and rules can be revised by the ministry, so applicants should check the official portal for current rates and eligibility before committing money.
Why has rooftop solar become so much cheaper?
Rooftop solar has become cheaper because the price of solar modules has fallen very steeply over the past decade, driven by large-scale manufacturing, better cell efficiency and fierce competition, mostly in China but increasingly in India too. Analysts commonly describe the fall in global module prices as around ninety per cent over about ten years, which has turned solar from a niche technology into one of the cheapest sources of new electricity.
India’s own tariffs for large solar parks have dropped to some of the lowest in the world, and rooftop systems have followed the curve, although small systems cost more per unit than utility-scale plants because of installation, wiring and sales costs. At the same time, grid electricity tariffs for households have generally tended to rise over time, so the gap between the two has shrunk year after year. This is why payback periods that once stretched beyond a decade now often fall within a handful of years.
Policy has also played a role. Earlier national targets for rooftop solar were ambitious and fell well short, as slow approvals, limited consumer finance and discom reluctance held growth back. The renewed push through PM Surya Ghar tries to address those problems with subsidy, finance and simplified procedures. India also has a wider goal of building very large non-fossil electricity capacity by 2030, and rooftop systems are a small but strategically important slice of that plan because they need no new land.
What are the benefits of rooftop solar for homes and the climate?
For a home, the main benefit of rooftop solar is a lower and more predictable electricity bill, along with some protection from future tariff increases and, with batteries or hybrid systems, backup during outages. A family that installs a suitably sized system can offset most of its yearly consumption, and the savings continue for the life of the panels.
For the grid and the climate the gains are broader. Power generated on the roof is consumed where it is made, so it avoids the losses that occur when electricity travels long distances over transmission and distribution lines. It also displaces coal-fired electricity, and since coal generation produces a large share of India’s carbon dioxide and local air pollution, every unit of rooftop solar helps reduce emissions. Rooftop systems take no farmland, forest or wildlife habitat, unlike large ground-mounted solar parks, which is a real advantage in a crowded country.
There are economic benefits too. Installation, maintenance and sales create local skilled jobs, from electricians to small vendors, spread across towns and districts. Small businesses, schools, hospitals and government buildings can cut running costs, freeing money for their core work. Rooftop solar can also make power supply more resilient in places where grid reliability is poor, and in summer, panels shade the roof and may reduce heat entering the building slightly, though this is a minor side effect.
What are the main hurdles for rooftop solar in India?
The main hurdles for rooftop solar in India are the high upfront cost, the lack of suitable or owned roof space, slow paperwork, uneven installation quality and the cautious stance of many power distribution companies. Many families live in rented or crowded housing, or in apartments where the roof is shared, which makes individual installation difficult.
Upfront cost remains a real barrier for low-income households even after subsidy, and bank finance for small solar loans has been patchy, with some lenders unfamiliar with the product. Shade from trees, water tanks and neighbouring buildings can badly cut output, and roofs that are weak, leaking or used for drying grain and clothes complicate matters. Dust in dry regions and heavy cloud in the monsoon lower yields, so promises of fixed savings should be treated cautiously.
Quality is another issue. A rush of demand can attract installers who use poor modules, thin cables or weak mounting structures, and a badly fitted system can underperform or become unsafe. Households should insist on approved vendors, standard-certified equipment, warranties and a clear commissioning report. Bureaucratic delays in meter replacement, inspection and subsidy release have also frustrated applicants in some states, and awareness in rural and small-town India is still limited.
How do power distribution companies view rooftop solar?
Power distribution companies, or discoms, have a mixed view of rooftop solar: they welcome clean power and lower peak demand, but worry about losing their best-paying customers and about managing a grid with many small generators. Most discoms are financially stretched, and wealthier households and commercial users, who pay higher tariffs that help subsidise farmers and poorer homes, are exactly those most likely to install solar.
When these consumers generate their own power, the discom sells fewer units at high rates while its fixed costs for wires, transformers and staff remain. This is sometimes called the cross-subsidy problem. Grid operators also face technical challenges: voltage fluctuations on local feeders, reverse power flow where networks were designed for one-way supply, and a steep evening ramp-up when solar output falls and demand rises, often described as the duck curve.
Regulators and policymakers are responding with new tariff designs, grid upgrades, smart meters and better forecasting. Some argue that discoms can gain by meeting renewable purchase obligations cheaply with distributed solar, by delaying costly network expansion and by reducing peak-hour purchases. A balanced approach, with fair compensation for exported power and fair charges for grid use, is widely seen as the route to a system that works for both households and utilities.
What should a household check before installing rooftop solar?
Before installing rooftop solar, a household should check its roof, its electricity use, the vendor’s credentials and the local rules, so that the system is the right size, safe and eligible for subsidy. A short checklist helps avoid the common mistakes.
- Roof: Confirm that you own or have permission to use the roof, that it is strong enough, and that it gets several hours of unshaded sun, especially from mid-morning to mid-afternoon.
- Consumption: Study twelve months of electricity bills to size the system to your actual use rather than to a salesperson’s suggestion.
- Vendor: Use an empanelled or approved installer, ask for references, and compare at least three quotes on equipment brand, warranty and after-sales service.
- Equipment: Look for certified modules and inverters, a clear warranty on panels, a separate warranty on the inverter, and a sturdy mounting structure.
- Paperwork: Check the discom’s net metering process, the timelines for inspection and meter replacement, and how the subsidy is paid.
- Maintenance: Plan for periodic cleaning, an annual check of connections and a budget to replace the inverter after about ten years.
A household that does this homework is far more likely to enjoy steady savings for decades. It is also wise to keep all documents, including the commissioning certificate and warranty cards, since they are needed for the subsidy and any later disputes.
Bottom Line
Rooftop solar is one of the most practical tools India has for cheaper power and lower emissions, since it puts generation on existing roofs, saves land and trims bills for the families that adopt it. The PM Surya Ghar scheme has given the sector a strong push through subsidy and finance, but the real test is delivery: honest installers, quick approvals, fair net metering and healthy discoms. Households that plan carefully can benefit for twenty-five years, while the country gains a cleaner and more distributed power system.
Frequently Asked Questions
What is rooftop solar?
Rooftop solar is a set of solar photovoltaic panels installed on a building’s roof that turns sunlight into electricity for use in the building, with surplus sent to the grid. It reduces the amount of electricity a household or business buys from its power company.
How much does a rooftop solar system cost in India?
Home systems commonly cost roughly Rs 50,000 to Rs 75,000 per kilowatt before subsidy, so a 3 kW system is often quoted at around Rs 1.5 lakh to Rs 2.25 lakh. Prices vary by city, brand and installer, so comparing several quotes is wise.
What is net metering?
Net metering is a billing system in which the units your solar panels send to the grid are credited against the units you draw from it, so you pay only the net difference. Rules and the treatment of leftover credit vary from state to state.
What is the PM Surya Ghar Muft Bijli Yojana?
It is a central scheme launched in 2024 to install rooftop solar on one crore homes by 2026-27, offering subsidy and low-cost loans. Its goal is to let many households generate their own power, with up to 300 units a month promoted as free electricity.
How long do rooftop solar panels last?
Solar panels are designed to last around 25 years, though their output slowly declines each year. The inverter usually needs replacing once during that period, often after about ten years.
Can I use rooftop solar if I live in an apartment?
Yes, but usually through a residents’ welfare association or housing society that installs panels on the shared roof to power common services such as lifts and lighting. Individual flats rarely have their own roof, so shared or community models are the practical route.
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