How Net Metering Works in India (Simple Homeowner’s Guide)

If you’re planning a rooftop solar system, “net metering” is the one term that decides how your bill will reduce month after month. Here’s a simple, homeowner-friendly explanation— without jargon.

 

What is net metering (in plain English)?

Net metering is a billing method where:

• Your solar power runs your home first
• Extra solar (unused in that moment) is exported to the grid
• Your imported units (grid used at night / cloudy hours) and exported units are adjusted in the bill

To make this possible, the DISCOM installs a bi-directional (net) meter that measures:

• Import (grid → your home)
• Export (your solar → grid)

The one-line idea: “Use solar, export extra, get bill credits”

Think of the grid like a “bank” for your extra daytime solar.

• Daytime surplus goes to the grid → you earn export units
• Nighttime usage comes from the grid → you spend import units
• Your bill adjusts based on the “net” difference (as per your state’s regulation)

A simple example (with numbers)

Assume in one billing cycle:

• You imported from grid: 220 units
• You exported to grid: 140 units

Then your “net” consumption is:

Net units = 220 – 140 = 80 units

So you typically pay energy charges on 80 units (plus fixed charges and other components as applicable).

If export is more than import

Example:

• Import: 180 units
• Export: 250 units

You have a surplus of 70 units.

What happens to the 70 units depends on your state rule:

• Some states carry it forward (banking) to next month
• Some settle it monthly/half-yearly/annually
• Some pay for surplus at a predefined rate at settlement time

State rules on settlement periods vary across India.

Net metering vs gross metering vs net billing (don’t mix these up)

Net metering (most homeowner-friendly)

• Import and export are adjusted primarily in units (kWh)
• Best when you want to offset your own bill

Gross metering

• Your entire solar generation is treated separately (often sold to the grid at a tariff)
• You buy your full consumption as usual from the DISCOM
• Many policies push larger systems toward gross metering

India’s central consumer rules provide for net metering up to 10 kW and gross metering above 10 kW (implementation still follows local DISCOM/SERC regulations).

Net billing (common in some states)

• Export is credited at a specified rate, import is charged at retail rate
• Calculation is value-based rather than pure unit-to-unit adjustment (varies by regulation)

What net metering can’t remove from your bill

Even with net metering, most homeowners still see some charges like:

• Fixed / demand charges (monthly)
• Meter rent / service charges
• Minimum charges (in some tariffs)

Example: Kerala’s regulator has upheld fixed charges for prosumers because the grid infrastructure is still being used.

Who can get net metering in India?

In practice, eligibility is decided by your state net metering regulation + DISCOM process, but typically:

• Rooftop solar system connected to your service connection
• Capacity often limited to your sanctioned load (or a percentage of it—state-specific)
• Single-phase/three-phase requirements as per load
• Approved inverter with anti-islanding protection (as per technical standards)

Grid connectivity technical requirements are guided by CEA connectivity standards for distributed generation.

 

Step-by-step: How homeowners actually get net metering

While steps vary by state, the flow is usually:

1) Check your sanctioned load & bill type

Your solar size approval is commonly linked to:

• sanctioned load / connected load
• tariff category (domestic, commercial)

2) Apply to your DISCOM (online portal or office)

You submit:

• application form
• recent electricity bill
• ID/address proof
• system details (kW, inverter specs, single-line diagram)

3) Feasibility check (if applicable)

Recent amendments have pushed faster approvals:

• systems up to 10 kW may be exempted from feasibility study
• above that, timelines are defined; “deemed approval” can apply if DISCOM delays beyond limits.

4) Install rooftop solar (via an empanelled/qualified vendor)

Important homeowner tip: don’t let anyone install first unless you’re clear on:

• net metering allowed for your category
• capacity limits
• inverter type approval

5) Inspection + meter replacement

DISCOM visits, checks safety, then installs/activates:

• bi-directional net meter
• sealing & commissioning report

6) Start exporting & track bills

From next billing cycle, your bill should show import/export/net units (format varies by DISCOM).

Special case: Apartments & multi-meter homes (virtual/group net metering)

If you live in an apartment or don’t have enough roof area, some states are starting to support virtual net metering and group net metering models.

MNRE has issued an SOP to guide states/DISCOMs on virtual and group net metering implementation.

(Availability is still very state-specific, but it’s a promising direction for RWAs and multi-storey buildings.)

 

Quick checklist before you commit to rooftop solar

• Confirm net metering / gross metering / net billing in your state
• Don’t oversize beyond what your DISCOM allows (often tied to sanctioned load)
• Ask your vendor for: single-line diagram, inverter datasheet, earthing plan
• Ensure your meter is truly bi-directional
• Understand settlement: monthly vs annual, and surplus payout rules (state-specific)

 

FAQs (Homeowner doubts)

Will my bill become zero?
Often the energy-charge part can drop sharply, but fixed charges and some fees remain.

What happens during a power cut?
Most grid-tied rooftop solar systems shut down during outages for lineman safety (anti-islanding). If you want backup, you’ll need a hybrid inverter + battery (and correct changeover design).

Can DISCOM change my net metering later?
States can revise regulations over time. Usually existing connections have transition provisions, but it’s not identical everywhere—keep your approval letters and commissioning documents.