Net Metering: Definition, Meaning, How It Works & Solar Industry Guide (India 2026)

Quick Facts

Term

Net Metering

What Is Net Metering?

Net metering is a regulatory and billing mechanism that allows rooftop solar consumers in India to send surplus electricity generated by their solar plant into the utility grid and receive a 1:1 kWh credit against the electricity they draw from the grid. The consumer is billed only for the net energy — total grid import minus total solar export over the billing cycle.

In formal regulatory language used by State Electricity Regulatory Commissions (SERCs), net metering is defined as “an arrangement under which a consumer who is also a generator of electricity from a renewable energy source is connected to the distribution network of a Distribution Licensee, and the difference between the energy supplied by the licensee and the energy generated by the consumer is the chargeable quantity.”

In the solar industry, net metering is the single most important policy lever that makes rooftop solar economically viable for self-consumption. Without it, every unit of solar generated during peak production hours (when the building isn’t using power) would be wasted. With it, that surplus becomes a stored credit on your electricity bill.

In the Indian context, net metering is regulated by individual SERCs under the framework provided by MNRE’s Grid Connected Rooftop Solar Programme. Each state has its own slightly different rules around capacity caps, settlement periods, and applicable consumer categories. The Central Electricity Authority (CEA) Connectivity Regulations 2019 set the broader technical interconnection standards.

Net Metering Explained Simply

Imagine your electricity meter as a tally board.

When you draw power from the grid, the board adds units to your bill.
When your solar panels produce more than your home is using, the extra flows back into the grid — and the board subtracts units from your bill.

At the end of the month, you pay only for what’s left on the board.

A real-life example:

A homeowner in Surat installs a 5 kW rooftop solar system that produces about 600 kWh per month on average. Their household consumes around 750 kWh per month.

Solar generation directly used by the home (daytime, real-time): 400 kWh

Solar surplus exported to grid: 200 kWh

Electricity drawn from grid (evenings, nights): 350 kWh

Net billable consumption = 350 (import) − 200 (export) = 150 kWh

Instead of paying for 750 units, the homeowner pays for just 150 units.

That’s net metering. The grid acts as your free, infinite-capacity battery during the daytime — you “deposit” solar, “withdraw” grid power at night, and pay only the difference.

Why Net Metering Matters

Net metering is the policy backbone of rooftop solar. Here’s why it’s load-bearing for every solar project in India:

Financial Impact

Improves payback period by 3–5 years. Without net metering, a residential solar system would have to be perfectly sized to daytime consumption to be economical. With net metering, you can size to your full annual consumption.
Eliminates the need for batteries in most residential installations. Batteries add ₹40,000–₹80,000 per kWh of storage; net metering replaces that with a near-zero-cost grid credit.
Locks in protection against tariff hikes. Every export unit is a hedge against future tariff increases by your DISCOM.

Technical Importance

Allows system sizing based on roof area or annual energy needs rather than instantaneous daytime load.
Removes the engineering complexity of managing daytime surplus on-site.

Business & Commercial Impact

For C&I consumers, net metering makes a CAPEX rooftop solar project competitive with grid power on a per-unit basis.
Reduces dependence on diesel gensets during day-time outages (when paired with a hybrid inverter).
Improves ESG and Scope 2 emissions reporting — exported solar units count toward renewable energy claims.

Compliance Impact

Net metering systems are mandatorily compliant with CEA Connectivity Regulations, IEC 61727, and IEEE 1547 for grid-interactive inverters.
Establishes a legal, auditable record of green energy exported — important for Renewable Energy Certificates (RECs) in some configurations.

How Net Metering Works (Step by Step)

Here’s the end-to-end flow of how a kilowatt-hour generated on your roof becomes a credit on your bill:

Solar generation. Your rooftop PV array (mono PERC, TOPCon, or bifacial panels) converts sunlight into DC electricity throughout the day.
DC → AC conversion. A grid-tied string inverter or microinverter converts DC to AC, synchronised to the grid’s voltage (230V / 400V) and frequency (50 Hz).
Priority self-consumption. The inverter feeds your home’s loads first. Any electricity you’re actively consuming is supplied by solar before drawing from the grid.
Surplus export. When solar generation exceeds real-time consumption, the excess flows back through your service line into the DISCOM grid.
Bidirectional metering. The DISCOM-installed net meter records imported units (grid → you) and exported units (you → grid) in separate registers.
Monthly netting. At billing, the DISCOM subtracts your exported kWh from imported kWh.
- If import > export: you pay for the difference at your normal retail tariff (₹ per unit).
- If export > import: the surplus is carried forward as a kWh credit to the next month.
Annual settlement. At the end of the financial year (typically 31 March), unused export credits are settled — either paid out at the state-notified Average Power Purchase Cost (APPC), or lapsed, depending on state policy.

The Net Metering Formula

Net Billable Energy (kWh) = Grid Import (kWh) − Solar Export (kWh)
Monthly Bill = Net Billable Energy × Retail Tariff (₹/kWh) + Fixed Charges + Taxes

Where:

Grid Import = total energy drawn from DISCOM (recorded by import register of bidirectional meter)
Solar Export = total energy fed into grid (recorded by export register)
Retail Tariff = your applicable slab tariff (varies by consumer category and state)
Fixed Charges = sanctioned-load–based charge that is not offset by solar export

Indian Solar Industry Context

Net metering in India is governed by a three-tier structure:

Central Framework (MNRE & CEA)

The Ministry of New and Renewable Energy (MNRE) issues the overarching Grid Connected Rooftop Solar Programme guidelines. The current Phase-II programme (extended into the PM Surya Ghar Muft Bijli Yojana) targets 40 GW of rooftop solar by FY 2027.

The Central Electricity Authority (CEA) sets technical interconnection norms under the CEA (Technical Standards for Connectivity of the Distributed Generation Resources) Regulations, 2013 and the CEA Connectivity Regulations, 2019.

State Regulations (SERCs)

Every state has its own Net Metering for Rooftop Solar PV Regulations, issued by the respective SERC. Key state highlights as of 2026:

Gujarat (GERC): Up to 1 MW for residential and commercial; settlement at financial-year end at GUVNL’s APPC. Bidirectional meter cost ~₹6,000–₹9,000.
Maharashtra (MERC): Net metering for ≤300 kW; net billing for 300 kW–500 kW; gross metering above. Settlement annually.
Karnataka (KERC): Net metering up to 1 MW. Strong DISCOM cooperation; quick approvals via Akshay Surya portal.
Tamil Nadu (TNERC): Net metering up to 999 kW for domestic, with capacity not exceeding sanctioned load. LT consumers face capacity caps; HT consumers have separate norms.
Delhi (DERC): Net metering up to 1 MW. Surplus exported credits paid out at end of settlement period at APPC.
Uttar Pradesh (UPERC): Net metering up to 2 MW (one of the highest caps). Faster rollout under PM Surya Ghar.
Rajasthan (RERC): Net metering up to 1 MW with banking permitted on monthly basis.

DISCOM Implementation

The actual rollout — application, feasibility study, meter installation, agreement signing — is done by your local DISCOM (UGVCL, BESCOM, MSEDCL, TPDDL, etc.). Most DISCOMs now have online portals (Gujarat’s Suryagujarat.guvnl.in, Karnataka’s Akshay Surya, MNRE’s National Portal for Rooftop Solar).

Market Adoption

As of early 2026, India has crossed 15 GW of installed rooftop solar capacity, with the PM Surya Ghar Muft Bijli Yojana driving residential adoption. Gujarat alone accounts for over 3.2 GW of rooftop installations — most of them net-metered.

Technical Deep Dive

Net metering is deceptively simple at the policy level but has real engineering implications.

Bidirectional Metering Technology

A net meter (also called a bidirectional meter or import-export meter) measures energy flow in both directions:

Import register: Records energy drawn from grid (kWh-in).
Export register: Records energy fed to grid (kWh-out).

Modern net meters in India are typically Class 1.0 accuracy smart meters with optical/IR/Modbus communication for DISCOM remote reading. They must comply with IS 16444 (Smart Meters) and IS 13779 standards.

Sizing Rules and Sanctioned Load

Most state regulations require that your solar capacity not exceed your sanctioned load (or contract demand). Why? Because exporting more power than your service connection is rated for would overload the local distribution transformer.

Example: If your residential connection has a sanctioned load of 5 kW, your maximum allowed solar PV capacity is 5 kWp (sometimes capped further at a percentage like 80% in some states).

Anti-Islanding & Safety

A grid-tied inverter feeding a net-metered system must include anti-islanding protection (per IEEE 1547 / IEC 62116). When the grid goes down, the inverter detects the loss within milliseconds and shuts off solar export. This prevents the dangerous condition where line workers are restoring a “dead” line that is actually being energised by an upstream rooftop solar system.

Voltage Rise & Grid Constraints

In areas with very high rooftop solar penetration, exported power can cause voltage rise in the local LT feeder, sometimes tripping inverters. DISCOMs handle this via:

Transformer-level monitoring
Inverter reactive power (Q) control modes
Capacity caps per Distribution Transformer (DT), typically 60–80% of DT rating

Performance Benchmark (CUF)

A well-designed net-metered rooftop system in India should achieve:

CUF (Capacity Utilisation Factor): 15–19% (depends on location, tilt, shading)
PR (Performance Ratio): 78–85%
Annual generation: 1,400–1,650 kWh per kWp installed (Gujarat, Rajasthan top the chart)

Real-World Examples

Residential — 5 kW system, Ahmedabad

Annual generation: 7,500 kWh
Annual household consumption: 9,000 kWh
Annual grid import: 3,500 kWh | Annual solar export: 2,000 kWh
Net billable: 1,500 kWh → ~₹13,000/year vs ₹78,000/year before solar
Payback: ~3.8 years with PM Surya Ghar subsidy

Commercial — 100 kW system, Surat textile showroom

Annual generation: 150,000 kWh
Annual consumption: 180,000 kWh (high daytime use)
Solar offsets ~83% of total bill
Payback: ~4.2 years with accelerated depreciation benefit

Industrial — 500 kW system, Vadodara packaging plant

Single-shift operation, heavy daytime load
Almost zero surplus export — direct self-consumption dominates
Net metering still useful for weekend/holiday surplus banking
Payback: ~3.5 years with AD + GST input credit

Institutional — 200 kW system, school in Gandhinagar

Generation during school hours fully self-consumed
Vacation periods (summer, Diwali) generate large surplus → net-metered credit covers October–March consumption
Demonstrates how net metering enables seasonal load shifting

Benefits of Net Metering

Maximises ROI on rooftop solar by valuing every exported unit at retail rate
Eliminates need for batteries in most use cases
Hedges against future grid tariff hikes
Allows oversizing up to sanctioned load for higher annual generation
Enables seasonal load balancing — banking surplus from summer for winter use
Reduces grid stress during daytime peak by injecting solar locally
Simplifies bill accounting — one combined bill, no separate solar revenue tracking
Improves property value — net-metered solar systems are bankable assets
Supports India’s renewable energy targets without subsidy burden on DISCOMs

Limitations & Trade-offs

Capacity caps: Most states limit net metering to 500 kW–1 MW. Larger systems must use net billing or open access.
Sanctioned load coupling: You can’t install more solar than your sanctioned load — a constraint for energy-hungry homes with under-sized connections.
No backup during outages: Standard grid-tied systems shut off in a grid failure unless paired with hybrid inverter + battery.
DISCOM resistance: Some DISCOMs (especially in states with poor finances) drag application timelines because rooftop solar erodes their highest-paying customer base.
Settlement risk: In some states, end-of-year surplus lapses instead of being paid out.
Voltage rise issues in high-penetration zones may require additional inverter tuning.
Annual settlement — you can’t carry credits beyond the financial year in most states.
Misconception alert: Many users assume net metering = “solar runs during power cuts.” It does not. That requires a hybrid inverter with battery backup.

Net Metering vs Gross Metering vs Net Billing

Feature	Net Metering	Gross Metering	Net Billing
What gets exported?	Surplus only (after self-consumption)	100% of solar generation	Surplus only
Export tariff	Same as retail tariff (1:1 kWh credit)	Fixed feed-in tariff (₹2.5–₹4/unit)	Lower than retail (e.g., APPC)
Self-consumption priority	Yes	No (all solar exported)	Yes
Best for	Residential & small C&I (high self-use)	Pure solar investors, low self-use	Larger C&I, post-cap installations
Typical ROI	Best	Moderate	Between net metering and gross
Common in India	All states, ≤500 kW–1 MW	Some states for >500 kW	Increasingly post-2024 reforms

For most rooftop solar customers in India, net metering remains the most economically favourable option, which is why nearly all residential systems and most small C&I systems target it.

Common Mistakes with Net Metering

Oversizing beyond sanctioned load. Application gets rejected; you’ve already bought the panels.
- Avoid by: Verifying sanctioned load on your latest bill before sizing the system.
Using an unauthorised inverter. Inverters must be MNRE-listed and ALMM-compliant.
- Avoid by: Working with an EPC that maintains an updated approved inverter list.
Submitting incomplete DISCOM application. Missing single-line diagram, technical data sheets, or SLD signatures causes weeks of delay.
- Avoid by: Letting your EPC handle the entire DISCOM coordination (Heaven Green Energy does this end-to-end).
Ignoring shading at design stage. A net-metered system that under-performs will erode the ROI calculation even if the meter works perfectly.
- Avoid by: Running a proper shading analysis pre-installation.
Mismatching meter phase. A 3-phase consumer with a 1-phase solar inverter creates unbalanced export — net meter may not credit correctly.
- Avoid by: Matching inverter topology to your service connection.
Not understanding the settlement period. Customers who oversize hoping to “build credits” lose surplus at year-end in some states.
- Avoid by: Sizing to ~95–105% of annual consumption, not 150%.
Filing wrong consumer category. Filing under domestic when actual use is commercial (e.g., home-office) can void the agreement later.
Skipping the load enhancement application. If your current sanctioned load is too low, enhance it before applying for solar — not after.
Forgetting about DISCOM-side electrical clearance. Many states require a CEIG / Electrical Inspector approval for systems >10 kW.
Assuming net metering = backup. It is not. Outage backup requires a hybrid system.

Best Practices

Design

Size to 95–105% of annual consumption to minimise year-end surplus loss
Use ALMM-listed modules and MNRE-empanelled inverters
Include a net-meter cabinet in the SLD that is accessible to DISCOM staff for monthly readings

Procurement

Insist on tier-1 panels (Bloomberg NEF tier-1 list) for bankable performance warranties
Choose inverters with Q-control capability for high-penetration areas
Get DISCOM-approved cable sizing for the export line

Installation

Earthing per IS 3043; lightning protection per IEC 62305
Cable run from inverter to net meter as short as possible to minimise voltage drop
Net meter location accessible to DISCOM meter readers

Operations

Track monthly import and export separately (most modern net meters display both)
Reconcile DISCOM bills monthly; flag any discrepancy in export accounting within 30 days
Have annual O&M done before the high-generation season (Feb–March in India)

Standards & Compliance

Net-metered rooftop solar in India must comply with:

MNRE Rooftop Solar Programme Phase-II Guidelines (sizing, eligibility, subsidy norms)
CEA Connectivity Regulations, 2019 (technical interconnection)
CEA (Measures relating to Safety and Electric Supply) Regulations, 2010 (safety)
State SERC Net Metering Regulations (state-specific rules, caps, settlement)
IEC 61215 / IEC 61730 for solar modules
IEC 62109 for inverters (safety)
IEC 61727 / IEEE 1547 for grid interconnection
IS 16444 for net meters (smart meter standard)
ALMM (Approved List of Models and Manufacturers) for modules
BIS certification for all electrical components
IS 732 / IS 3043 for electrical installation and earthing

Key Takeaways

Net metering is a billing arrangement where solar exports offset grid imports on a 1:1 kWh basis.
It is the most economically favourable policy for rooftop solar self-consumers in India.
Eligibility, caps (typically 500 kW–1 MW), and settlement rules are set by each state’s SERC.
It requires a DISCOM-installed bidirectional meter and a grid-tied, anti-islanding–compliant inverter.
A correctly sized net-metered system in India delivers payback in 3–5 years and ROI over a 25-year panel life of 3–5× the initial CAPEX.
It does not provide backup during outages — for that, you need a hybrid (battery) system.
Net metering is gradually being supplemented (not replaced) by net billing for larger consumers — but remains the default for residential rooftop solar in 2026.

Frequently Asked Questions

What is net metering in simple terms?

Net metering is a system where the electricity you export to the grid from your rooftop solar plant is subtracted from the electricity you draw from the grid. You pay only for the difference (the *net* amount). If you export more than you import in a billing cycle, the surplus is carried forward as units (kWh) to the next bill.

Is net metering allowed in India in 2026?

Yes. Net metering is allowed in India for rooftop solar systems, typically up to 500 kW for residential and commercial users, and up to 1 MW or the sanctioned load (whichever is lower) for many states. Capacity limits and rules are set by the respective State Electricity Regulatory Commission (SERC) and updated periodically.

What is the difference between net metering and gross metering?

In *net metering*, you self-consume solar first and only export the surplus — billed on the net difference. In *gross metering*, 100% of your solar generation is exported to the grid at a fixed feed-in tariff (usually lower than the retail tariff), and you separately buy all your consumption from the grid at retail rates. Net metering almost always gives better ROI for self-consumers.

What size solar system is eligible for net metering?

Eligibility varies by state. Most SERCs allow net metering for systems up to 500 kW; some allow up to 1 MW. The sanctioned solar capacity also cannot exceed your sanctioned load or contract demand (this rule varies). Above these caps, consumers typically move to net-billing or gross metering.

How is the surplus solar energy credited under net metering?

Surplus units exported in a billing cycle are carried forward as kWh credits to the next month's bill. At the end of the settlement period (usually one financial year, 1 April–31 March), any remaining surplus is either paid out to the consumer at a state-notified Average Power Purchase Cost (APPC) or — in some states — lapsed.

Do I need a special meter for net metering?

Yes. The DISCOM installs a *bidirectional energy meter* (also called a net meter) that records both import (grid → consumer) and export (consumer → grid) of electricity separately. Standard unidirectional meters cannot be used because they only record consumption.

Does net metering work during a power cut?

No. Standard grid-tied solar systems with net metering automatically shut down during a grid outage. This is a mandatory safety feature (anti-islanding) to protect line workers. To get backup power during outages, you need a hybrid inverter with a battery or a separate UPS — but those circuits do not export to the grid.

Is there a fee or charge for net metering in India?

Yes, most DISCOMs charge a one-time application fee, a meter cost (₹6,000–₹15,000 depending on phase and class), and a feasibility/inspection fee. Some states also levy a small monthly grid-support or wheeling charge on rooftop solar consumers. Heaven Green Energy includes all DISCOM coordination in our EPC scope.

How long does it take to get a net metering connection?

After commissioning, the typical DISCOM net-meter installation timeline in India is 15–45 working days, depending on the state and discom. Gujarat (UGVCL, MGVCL, DGVCL, PGVCL) and Karnataka are among the faster states; some northern DISCOMs take longer due to backlog.

Can I get a subsidy on a net-metered solar system?

Yes. Under the PM Surya Ghar Muft Bijli Yojana, residential consumers in India are eligible for Central Financial Assistance (CFA) on systems up to 10 kW, provided they install with an empanelled vendor and complete the DISCOM net-metering application. Commercial and industrial systems are not eligible for residential CFA but can use accelerated depreciation.

What happens to my net-metered system if I sell my home?

The net-metering agreement is between the DISCOM and the electricity consumer (the registered service connection holder). When ownership transfers, the new owner must apply to the DISCOM to transfer the net-metering agreement along with the electricity connection. The solar plant itself, being permanently affixed, transfers with the property.

Does net metering apply to three-phase and single-phase connections?

Yes. Net metering is available for both single-phase (residential, small commercial) and three-phase (larger residential, commercial, industrial) connections. The bidirectional meter must match the phase and current class of the existing service connection.

What is the difference between net metering and net billing?

*Net metering* credits exported units 1:1 against imported units (same retail tariff). *Net billing* credits exported units at a different (usually lower) rate than imported units — for example, you pay ₹8/unit for import but get only ₹3/unit credit for export. Some Indian states (and most large C&I consumers above caps) are moving toward net billing.

Will net metering be replaced by net billing or gross metering in India?

The Government of India has signalled a gradual shift toward net billing for larger consumers (>10 kW for some states, >500 kW for others) while preserving net metering for small residential systems. As of 2026, net metering remains the default and most favourable arrangement for residential rooftop solar across India.