Net Metering in India: Complete Guide to Selling Solar Power Back to Grid

If you install rooftop solar in India, your panels will routinely generate more electricity than your home or business can use at that exact moment — especially during sunny afternoons when nobody is home. Net metering is the policy that lets you push that surplus back into the grid and get credited for it, effectively turning the public grid into a giant, free battery. Understanding how net metering works, how to apply for it through your DISCOM, and how billing credits are calculated is the difference between a solar system that "saves a bit" and one that wipes out your electricity bill almost entirely.

This guide walks through everything: the technical mechanics, the difference between net metering and its alternatives, eligibility and system-size rules, the step-by-step application process, how units are banked across a billing cycle, state-by-state variations, and practical ways to maximize what you earn.

What Net Metering Is and Why It Matters

Net metering is a billing arrangement that measures the difference between the electricity you import from the grid and the electricity you export to it. Instead of paying for every unit you consume, you only pay for your net consumption — the imported units minus the units your solar system exported.

Here's why that matters in practice. A rooftop solar system produces the most power in the middle of the day. But peak household demand is usually in the evening (lights, ACs, cooking, TVs) when the sun is gone. Without net metering, all that midday surplus would be wasted unless you bought expensive batteries. Net metering solves this elegantly:

• During the day, excess solar flows out to the grid and you earn credits.
• In the evening or at night, you draw in from the grid using those credits.
• At the end of the billing cycle, you only pay for the net difference.

This is what allows a correctly sized residential system to bring monthly bills down to near the fixed charges — sometimes just a few hundred rupees. It's also the single biggest reason rooftop solar payback periods in India have compressed to 3-6 years for most homes once you factor in subsidies. You can estimate your own numbers using our solar savings calculator.

Beyond economics, net metering also reduces strain on the grid during peak daytime demand and displaces coal-fired generation. Given India's grid emission factor of roughly 0.82 kg of CO2 per kWh, every unit you export is a small but real cut in carbon emissions.

How Net Metering Works Technically

The heart of the system is a bidirectional (net) meter — a single electricity meter that can spin (or count digitally) in both directions. It replaces your old import-only meter.

The meter records two separate readings:

1. Import (kWh imported) — electricity you draw from the grid, typically at night, on cloudy days, or whenever your demand exceeds solar production.
2. Export (kWh exported) — surplus solar electricity you send back to the grid when your production exceeds your consumption.

Your solar inverter is synchronized with the grid frequency (50 Hz in India) and feeds AC power into your home's distribution board. The logic of where the electrons go is automatic and instantaneous:

• Solar > demand: Your loads are powered entirely by solar, and the surplus flows back through the meter to the grid. The export counter goes up.
• Solar < demand: Solar covers part of your load and the grid makes up the shortfall. The import counter goes up.
• Solar = demand: Nothing flows in either direction.

At the end of the billing cycle, the DISCOM reads both numbers. Your bill is calculated on:

Net units billed = Total units imported − Total units exported

If you imported 600 units and exported 450 units in a month, you are billed for only 150 units (plus fixed charges). If you exported more than you imported, those extra units are usually carried forward as a credit to the next cycle — this is called banking, covered in detail below.

A critical safety feature is anti-islanding protection: grid-tied inverters automatically shut down if the grid goes down (a power cut). This protects line workers from being electrocuted by power your system might otherwise feed into "dead" lines. It also means a standard net-metered system does not provide backup during outages unless you add batteries with islanding capability.

Net Metering vs Gross Metering vs Net Billing

These three terms are often confused, and the difference directly affects how much you earn. DISCOMs across India use different models, so check which one applies to you.

Net Metering

You consume your own solar first, and only the surplus is exported. You're billed on the net difference at the retail tariff. This is the most consumer-friendly model because every unit you self-consume offsets a unit you'd otherwise buy at retail rates — which are higher than wholesale feed-in rates. For most residential and small commercial users, net metering gives the best returns.

Gross Metering

All the solar you generate is exported to the grid at a fixed feed-in tariff (FIT), and all the electricity you consume is bought from the grid at the retail tariff — through two separate meters. You don't self-consume at all. This model only makes sense when the feed-in tariff is higher than the retail tariff, which is rarely the case for residential users today. Gross metering is more common for larger ground-mount or commercial plants set up specifically to sell power.

Net Billing / Net Feed-in

A middle path increasingly adopted by states. You self-consume your solar, but exported surplus is valued at a lower rate (often an "Average Pooled Power Purchase Cost" or APPC, or a notified feed-in rate) rather than the full retail tariff. So your self-consumed units save you the full retail rate, but your exported units earn less. This protects DISCOM finances but slightly reduces returns for systems that export a lot of surplus.

The practical takeaway: Net metering rewards self-consumption equally for both import-offset and export. Net billing rewards self-consumption but penalizes over-export. Gross metering ignores self-consumption entirely. When you size your system, the metering model your state uses should influence how much surplus you design for — under net billing, an oversized system that dumps lots of cheap surplus is less attractive.

Eligibility and System-Size Limits

Net metering eligibility is tied primarily to your sanctioned load (the connected load your DISCOM has approved for your connection) and the transformer/feeder capacity in your area.

General rules that apply across most states:

• System size vs sanctioned load: Your solar system capacity is typically capped at a percentage of your sanctioned load — commonly 100% to 110%, though some states allow up to 100% of the contract demand and others are more generous. If your sanctioned load is 5 kW, you'll usually be allowed a solar system up to roughly 5 kW under net metering. To go bigger, you may need to apply for a load enhancement first.
• Upper capacity cap: Many states cap net-metered systems at around 500 kW per connection (some allow more, some less). Beyond this threshold, larger systems often move to net billing or open-access arrangements.
• Transformer loading limit: DISCOMs often restrict the cumulative rooftop solar on a single distribution transformer (DT) — frequently to around 70-80% of the DT's rated capacity. If your local transformer is already saturated with other solar connections, your application can be queued or refused until capacity is available. This is one of the most common, and most frustrating, technical rejection reasons.
• Connection type: Residential, commercial, industrial, institutional, and government connections are generally all eligible, subject to category-specific size limits.

Residential context: Typical residential systems in India range from 3 kW to 20 kW. You need roughly 100 sq.ft of shadow-free roof per kW, so a 5 kW system needs about 500 sq.ft. Sizing your system to match your actual annual consumption — rather than maximizing roof coverage — is usually the smartest move under net metering, and it sidesteps several eligibility headaches.

Step-by-Step DISCOM Application Process

The process is broadly similar across DISCOMs, and the PM Surya Ghar Muft Bijli Yojana national portal has streamlined much of it for residential applicants. Here's the typical flow:

1. Register and apply online. For residential subsidy-linked installations, register on the national PM Surya Ghar portal (pmsuryaghar.gov.in) and submit your net metering / feasibility application, which routes to your DISCOM. Larger or non-subsidy applications go directly through your DISCOM's online portal.

2. Feasibility / technical approval. The DISCOM reviews whether your sanctioned load and local transformer have capacity for the proposed system. If approved, you receive a technical feasibility clearance. This is the stage where transformer-saturation rejections occur.

3. Select an empanelled vendor and install. Choose a DISCOM-empanelled installer and get the system installed using BIS-certified, ALMM-approved components. Using approved gear is mandatory for both net metering approval and subsidy eligibility. (Xrossways Solar installs only Made-in-India, BIS-certified, ALMM-approved components with in-house engineering.)

4. Submit installation details and request inspection. After commissioning, upload the installation report, inverter and module details, and electrical wiring diagram. Request the net meter installation and inspection.

5. Net meter installation and inspection. A DISCOM engineer (and, where required, an electrical inspector for larger systems) verifies the installation for safety and compliance, then installs the bidirectional meter.

6. Sign the net metering agreement. You sign a connection/net-metering agreement with the DISCOM specifying the metering arrangement, settlement terms, and validity.

7. Commissioning and go-live. Once the meter is in and the agreement signed, your system goes live and credits start accruing. For PM Surya Ghar applicants, the subsidy is disbursed to your bank account after commissioning and meter installation are verified.

Documents You'll Typically Need

• Recent electricity bill (to confirm consumer number and sanctioned load)
• Identity and address proof (Aadhaar, PAN)
• Proof of property ownership or an NOC from the owner
• Cancelled cheque / bank account details (for subsidy disbursement)
• Roof / site photographs
• Vendor details, system datasheet, and warranty documents
• Signed net metering application form

Processing time varies widely by state and DISCOM efficiency — anywhere from a couple of weeks to a couple of months. Using an experienced empanelled installer who handles the paperwork end-to-end (rather than subcontracting it) is the single biggest factor in avoiding delays.

How Billing, Credits, and Banking Work

This is where net metering gets genuinely valuable, and where the rules get state-specific.

Within a billing cycle (usually monthly or bimonthly):

Your bill nets imports against exports. If you exported more than you imported, the surplus units don't vanish — they're banked and carried forward to offset consumption in the next cycle. This rolling carry-forward is what smooths out seasonal mismatches: you build up credits during sunny, low-consumption months and draw them down during cloudy or high-AC months.

At the end of the settlement period (usually the financial year, ending 31 March):

If you still have unadjusted surplus credits left over after the full year, the DISCOM settles them. The settlement rate is almost always lower than the retail tariff — typically the state's notified feed-in rate or the Average Pooled Power Purchase Cost (APPC), which might be in the range of ₹2-4/unit depending on the state. In some states, any leftover surplus is simply lapsed (forfeited) rather than paid out.

The key implication: Banking favors self-consumption, not over-production. You get full retail value for units that offset your own consumption, but only a low feed-in rate (or nothing) for net annual surplus. So the ideal system is sized so your annual generation roughly matches your annual consumption — you bank credits month to month, but you don't end the year with a large unpaid surplus.

Worked Example: 5 kW Delhi Home

Let's make this concrete. Assume a Delhi home installs a 5 kW rooftop system.

• System cost (2026): 5 kW × ~₹65,000/kW ≈ ₹3,25,000
• PM Surya Ghar subsidy: ₹30,000 (1st kW) + ₹30,000 (2nd kW) + ₹18,000 (3rd kW), capped at ₹78,000 for 3 kW and above → −₹78,000
• Net investment: ₹2,47,000

Now the energy side. A 5 kW system in Delhi generates roughly 7,000-7,500 units per year (assuming ~4 units per kW per day). Suppose the home consumes about 6,500 units/year at an effective retail tariff of ₹8/unit.

• Annual self-consumption + net-metered offset: ~6,500 units × ₹8 ≈ ₹52,000 saved
• Annual net surplus (~700 units): banked through the year; any leftover at FY-end settled at the low feed-in rate (say ₹3/unit ≈ ₹2,100)
• Approximate annual benefit: ~₹54,000

Simple payback: ₹2,47,000 ÷ ~₹54,000 ≈ 4.5 years

After payback, you enjoy 20+ years of near-free electricity, since panels carry 25-year performance warranties and last 25+ years. (Exact figures depend on your consumption pattern, tariff slab, and shading — run your own scenario on the calculator.)

For commercial users, the math is often even stronger: commercial tariffs run ₹8-12/unit, and businesses can claim 40% accelerated depreciation in the first year, which dramatically improves after-tax returns. We cover the financing and tax angles in detail in our guide to solar financing in India.

State-Wise Variations

Net metering is regulated at the state level by each State Electricity Regulatory Commission (SERC), so rules differ meaningfully across the country. Always confirm the current policy with your specific DISCOM, but here's how the landscape generally varies.

Delhi

Delhi has been among the most rooftop-solar-friendly jurisdictions, with established net metering for residential and other categories through DISCOMs like BSES Rajdhani, BSES Yamuna, and Tata Power-DDL. Surplus is generally carried forward and settled annually. Delhi has also layered additional state-level support (such as generation-based incentives in certain windows) on top of the central subsidy in the past — worth checking whether any state top-up is active when you apply.

Haryana

Net metering is available across Haryana through UHBVN and DHBVN. Haryana follows the standard sanctioned-load-linked sizing and transformer-capacity rules. It's an active rooftop market, and one of Xrossways Solar's core operating regions, so installer familiarity with local DISCOM procedures is readily available.

Punjab

PSPCL administers net metering in Punjab with sanctioned-load-based caps and the usual feasibility-then-installation workflow. Punjab is another of Xrossways Solar's primary regions; agricultural and residential rooftop adoption has been growing steadily.

Gujarat

Gujarat has historically been one of India's most aggressive rooftop solar states, with high adoption under schemes like Surya Gujarat. Note that Gujarat has at times used net billing-style settlement rather than pure net metering, where surplus is purchased at a notified rate — a reminder that the metering model itself can differ by state, not just the tariff.

Maharashtra

MSEDCL operates net metering across Maharashtra. Maharashtra has periodically revised its rules around the net metering vs net billing threshold (for example, applying net billing above certain system sizes). High retail tariffs in many slabs make rooftop solar particularly attractive here.

Across all states, the variables that change are: the exact sizing cap (% of sanctioned load), the surplus settlement rate, whether the model is net metering or net billing, the transformer-loading threshold, and the annual settlement treatment (carry-forward, paid, or lapsed). The mechanics in this guide hold everywhere; the numbers are local.

How to Maximize Your Earnings

Once your system is live, a few deliberate choices meaningfully increase your savings:

1. Size to your annual consumption, not your roof. Because net annual surplus is settled at a low rate, the sweet spot is matching yearly generation to yearly use. An oversized system pours cheap surplus into the grid; a right-sized one offsets expensive retail units.

2. Shift flexible loads to daylight hours. Running your washing machine, dishwasher, water heater, EV charging, and pool/irrigation pumps during the day means you self-consume those units at the full retail value instead of exporting them cheaply. This is the highest-leverage habit change you can make.

3. Keep panels clean and unshaded. Dust and shading are the most common causes of underperformance in India. A small amount of shade on a string can disproportionately cut output. Regular cleaning (especially in dusty regions) and shadow-free placement protect your generation.

4. Use monitoring to catch faults early. A panel string that's been offline for weeks is pure lost revenue. Real-time monitoring (Xrossways provides 24/7 monitoring) flags underperformance, inverter faults, or grid disconnections so you can fix them fast.

5. Stack incentives. Combine net metering with the PM Surya Ghar subsidy (up to ₹78,000 residential) and — for businesses — accelerated depreciation. See our breakdown of government solar subsidies for 2026 to make sure you're claiming everything you're entitled to.

6. Consider a battery only if your economics justify it. Net metering already gives you "virtual storage" via the grid. Batteries make sense mainly for backup during outages or where net metering rules are unfavorable (e.g., low feed-in settlement). Don't add batteries reflexively — model the numbers first.

Common Rejection Reasons

Knowing why applications get rejected lets you avoid the pitfalls:

• Transformer / feeder saturation. The most common technical rejection. If cumulative rooftop solar on your distribution transformer has hit the DISCOM's cap (often ~70-80%), your application gets queued or refused until capacity frees up or the DT is upgraded.
• System size exceeds the sanctioned-load cap. Proposing a system larger than your allowed percentage of sanctioned load. Fix: apply for a load enhancement first, or downsize the system.
• Non-approved components. Using modules or inverters that aren't BIS-certified / ALMM-approved disqualifies you from both net metering and the subsidy.
• Incomplete or inconsistent documentation. Mismatched names on the bill vs ID, missing ownership proof/NOC, or a missing electrical inspection certificate (for larger systems).
• Unsafe or non-compliant installation. Failing the DISCOM inspection on wiring, earthing, anti-islanding protection, or structural safety.
• Outstanding dues on the connection. Pending electricity bills on the consumer number can block the application.
• Applying on a connection you don't own without an NOC. Tenants and shared-roof setups need proper owner authorization.

A capable empanelled installer screens for these issues before submitting, which is exactly why end-to-end, in-house handling (no subcontracting the paperwork) prevents most delays.

Frequently Asked Questions

Does net metering give me backup power during outages? No, not by itself. Standard grid-tied systems shut down during a grid outage for safety (anti-islanding). For backup, you need batteries with islanding capability — a separate decision from net metering.

What happens to my unused export credits at year-end? It depends on your state. Most DISCOMs carry surplus forward through the financial year and then settle any remaining surplus at a low feed-in / APPC rate. Some states lapse leftover surplus entirely, which is why matching your system size to consumption matters.

Can I get net metering and the PM Surya Ghar subsidy together? Yes. For residential installations, net metering and the central subsidy (up to ₹78,000) are designed to work together through the same PM Surya Ghar process.

Is there a fee for the net meter? The bidirectional meter is typically installed by the DISCOM, sometimes at a nominal charge to the consumer. Costs vary by state and category.

How long does the whole process take? Anywhere from about two weeks to two months, depending on your DISCOM's efficiency, transformer capacity availability, and how complete your documentation is.

What if my sanctioned load is too low for the system I want? Apply for a load enhancement with your DISCOM first, then proceed with the larger system. Your installer can advise on whether enhancement is worthwhile for your consumption.

Conclusion

Net metering is what makes rooftop solar in India financially transformative rather than merely "nice to have." By letting you bank surplus daytime generation against your evening and nighttime usage, it can shrink an electricity bill to almost nothing — with payback periods of roughly 4-6 years for most homes and even faster for businesses claiming accelerated depreciation. The keys are sizing your system to your actual annual consumption, using BIS-certified and ALMM-approved components, shifting flexible loads to daylight hours, and choosing an installer who handles the DISCOM paperwork properly the first time.

If you'd like to see exactly what net metering could save you — based on your roof, your consumption, and your state's tariffs — start with our solar savings calculator, or talk to the Xrossways Solar team for a free, no-pressure assessment. With 10+ years of experience, 200+ completed projects, and in-house engineering across 15+ states, we'll handle the net metering application end to end so you can start earning from your roof sooner.