Gross Metering vs Net Metering: Which to Choose?

Short version. Net metering usually favours a residential consumer because self consumed units offset electricity at the retail tariff. Gross metering values output at a separately determined rate. Check which arrangement your DISCOM currently offers your consumer category before you design the system.

How each arrangement actually works

The difference is where your solar output goes before it is measured.

Under net metering, generation first supplies the loads in your building. Only what you do not use flows to the grid, and a bidirectional meter records import and export separately. Every unit you self consume is a unit you did not buy at the retail tariff, so it is effectively valued at retail.

Under gross metering, the entire solar output is exported to the grid and measured by a dedicated meter. Your building consumes from the grid as before, billed in full at the retail tariff. The exported generation is credited at a separately determined rate.

Identical hardware, identical generation, very different bills. The mechanism, not the equipment, produces the difference.

Core comparison

Worked arithmetic

Now consider the same building under gross metering. All generation is exported and credited at the determined rate. Consumption is billed in full at retail. The outcome depends entirely on the gap between those two rates, and where the export rate sits below retail, the gross arrangement returns less for the same generation.

This is why a rupee figure quoted from another state is not transferable. Without the applicable rates, the settlement rule and the metering boundary, any savings number is invented rather than calculated. Get your own DISCOM’s current rates and run the arithmetic on them.

Self consumption is the variable that decides it

Under net metering, the more of your generation you use yourself, the better the arrangement performs, because self consumed units are valued at retail while exported units are usually valued at or below it.

A household that is empty all day exports most of its generation and gains less from net metering than one running daytime loads. Shifting flexible consumption such as water heating, pumping or laundry into generating hours changes the outcome without changing the hardware.

Under gross metering this lever disappears. Every unit is exported at the determined rate regardless of when you consume, so load shifting has no effect on the solar side of the bill.

The settlement rule matters as much as the rate

Applicants focus on the rate and overlook what happens to unused credits, which can matter more for an oversized system.

State orders differ. Some carry surplus credits forward within a settlement year. Some pay out unused credits at year end at a specified rate. Some allow them to lapse.

If credits lapse, a system generating well above your annual consumption is producing units you will never be paid for. That makes the settlement rule a sizing input, not an administrative footnote. Confirm it before agreeing to a capacity above your own usage.

Reading your first bill under each arrangement

Check the first statement carefully, because an error established in cycle one tends to persist.

Under net metering, confirm that import and export appear as separate readings rather than a single net figure, that the export quantity is broadly consistent with your monitoring, that any carry forward credit from the previous period is shown, and that fixed and demand charges are applied as expected. Fixed charges usually remain payable in full regardless of how much solar you generate, which surprises consumers who expected a near zero bill.

Under gross metering, confirm that consumption is billed at the correct retail tariff, that the generation meter reading matches your own records, and that the export credit is applied at the determined rate for your category and commissioning date. Where the rate was fixed at commissioning, check that the rate on the bill is the one that applied on that date rather than a later revision.

In both cases keep the approval document, the applicable order and your own generation records together. A billing dispute is resolved by those three things, and reconstructing them a year later is considerably harder than filing them at commissioning.

You usually do not get to choose

This is the practical point that resolves most of the debate.

The arrangement available to you is set by your state’s regulations and your consumer category, and some states apply gross metering above a capacity threshold or to specific categories. Where only one arrangement is offered for your category, comparing them is an academic exercise.

Check the current position for your DISCOM and your category first, then design for the arrangement you can actually obtain. The net metering application guide covers the process, and the approval timeline guide helps track it.

A meter type by itself does not establish the billing policy. Keep the utility’s written approval and the applicable order with your system documents, because that is what governs if a billing dispute arises later.

Where zero export fits

A zero export arrangement is an operational control that prevents intentional injection into the grid. It is not a billing arrangement and does not belong in this comparison.

It becomes relevant where export is restricted or unavailable, since a system that cannot export must be designed around self consumption. Where connected to the utility it still requires a supported and approved design.

For a residential project

For a residential installation the PM Surya Ghar guide covers the scheme context, including the point that central financial assistance is calculated from eligible installed module capacity and is a separate question from the metering arrangement.

Ask any installer quote to state which arrangement it assumes, which rates the projections use, and who submits the application.

Contact Qbits for model specific inverter documentation to support the utility application. Confirm the billing arrangement itself against the current DISCOM or regulator document rather than a sales projection.