Your solar electricity bill payment works differently from a standard residential bill — and once you understand the net metering logic behind it, what initially looks confusing becomes straightforward.

A solar rooftop consumer with net metering gets billed on the difference between what they consumed from the grid and what they exported to it. Some months that difference is a small positive number. Other months, particularly in peak generation seasons, it is zero — or a credit carried forward. The bill structure is the same as a standard bill. What changes is the number it's applied to.

If your bill shows credits instead of charges, or a figure far lower than your pre-solar bill, the net metering logic behind it is straightforward — and this article walks you through it.

How Net Metering Billing Actually Works

Net metering is a billing system for grid-connected solar systems. It allows your rooftop solar panels to send extra electricity back to the power grid. Your meter records both the electricity you import from the grid and the electricity you export to it. At the end of the billing period, the two are compared — which is why it is called net metering.

The meter installed for this purpose is a bi-directional meter. Unlike a standard single-direction meter that only counts units consumed, a bi-directional meter records flow in both directions — import and export — simultaneously. Your DISCOM installs this as part of the net metering approval process.

Your bill shows two figures: units imported from the grid and units exported to it. Under net metering, you consume first; surplus exports earn credits that offset your bill within settlement timelines. The energy charges on your bill are calculated on the net figure — imports minus exports — rather than gross consumption.

Net metering rules are made at the state level. State Electricity Regulatory Commissions issue regulations. DISCOMs implement them. MNRE provides national policies and guidelines. This means every state has slightly different limits, paperwork, timelines, and credit rules. What applies in Maharashtra may not apply in Kerala. Your DISCOM's net metering order is the definitive reference for your specific situation.

Why Your Solar Bill Might Be Zero — or Negative

In months when your solar system generates more than you consume, your exports exceed your imports. The net consumption figure is zero or negative. A zero net figure means no energy charges apply that billing cycle — though fixed charges still apply regardless of generation. A negative figure means surplus credits are carried forward to the next period.

The bill does not disappear entirely. Fixed charges — calculated on your sanctioned load — remain payable every month. Electricity duty and other state levies may also apply on imported units even when the net figure is low. So a "zero bill" in common usage usually means zero energy charges, not zero total.

If you produce more than you consume, those surplus units are carried forward as credits or converted into cash payments based on predefined export rates. Most states allow credits to carry forward monthly or annually. Some states allow cash settlement after one year. Whether your accumulated credits are adjusted against future bills or paid out as cash depends on your state's net metering order and your DISCOM's settlement policy.

How Solar Credits Are Settled

Under net billing — which some states apply instead of pure net metering — exports are valued at a preset tariff while imports are billed at retail rate. Credits don't always offset on a one-to-one basis. The distinction matters. In pure net metering states, one exported unit offsets one imported unit at the same retail tariff rate. In net billing states, the export credit is typically lower than the retail import rate — meaning the offset is less than one-to-one.

The State Electricity Regulatory Commissions (SERCs) determine solar export tariffs based on cost of generation, grid draw, and regional demand. Check your DISCOM's published net metering order to confirm which model applies to your connection and what the current export credit rate is.

The timeline and process for this payment varies — some DISCOMs credit it in the following cycle, others require a separate claim. Your DISCOM's consumer portal is typically where this settlement is tracked and claimed.

Claiming the PM Surya Ghar Subsidy

Under the PM Surya Ghar: Muft Bijli Yojana, you can claim up to ₹78,000 subsidy for installing a solar rooftop system. This is a central government scheme administered through MNRE, and the subsidy is processed after the system is commissioned, and the net metering connection is activated.

The application is submitted through the PM Surya Ghar portal at pmsuryaghar.gov.in. After system commissioning, upload the required documents — commissioning certificate, installation photographs, bank account details — through the portal. The subsidy is credited directly to your bank account after DISCOM verification.

The subsidy amount depends on system capacity. Do not apply through third-party portals or installers claiming to process the subsidy on your behalf — the official route is the portal only.

What to Do If Your Solar System Underperforms

A solar system that generates fewer units than expected shows up quickly on your bill. Your import figure rises without a corresponding rise in export credits. Before assuming a billing error, check your inverter generation log — most inverters display daily and monthly generation data, and many have an associated monitoring app.

If generation is consistently below the system's rated capacity, the issue is typically panel soiling, shading from a new obstruction, an inverter fault, or a wiring degradation over time. These are maintenance issues, not billing issues. Contact your solar installer or service provider for a system health check.

If the generation data from your inverter and the export figure on your bill don't match — the inverter shows higher exports than the bill credits — raise a complaint with your DISCOM citing both figures. A meter accuracy test may be required to resolve the discrepancy.

How to Pay Your Solar Electricity Bill Online

Any outstanding amount on your solar electricity bill — fixed charges, net energy charges, or levies — can be paid through the Shriram One App via BBPS, the Bharat Bill Payment System. BBPS covers electricity bill payments across all major state DISCOMs in India, including those with net metering consumers.

Open the app, go to the BBPS section, select your distribution company, enter your consumer number, and confirm. The payment processes immediately and a digital receipt is generated — useful for your records and for cross-referencing against the credit adjustments shown on your next bill.

If your bill shows zero payable after credits, no payment action is needed that cycle. The Shriram One App will show the outstanding amount against your consumer number — if that figure is zero, your credits have fully offset the charges.

Manage electricity, gas, water, and mobile recharge payments at Shriram finance.

FAQs

1. Why is my solar bill negative?

A negative bill means your solar system exported more units to the grid than you imported during the billing period. The surplus becomes a credit. Most states carry this credit forward to offset future bills rather than paying it out immediately. Fixed charges still apply each month regardless of how much you generate — a negative net energy figure does not make the entire bill zero.

2. How are net metering credits applied?

Credits are applied against your energy charges in subsequent billing periods. The exact settlement timeline — monthly carry-forward, annual settlement, or cash payout — depends on your state's net metering order and your DISCOM's policy. Check your DISCOM's published net metering regulations or their consumer portal for the current settlement rules applicable to your connection.

3. Can I pay my solar electricity bill via UPI?

Yes. Any outstanding amount on your solar bill can be paid via UPI through BBPS-enabled platforms including the Shriram One App. Select your distribution company, enter your consumer number, and the current outstanding amount is displayed. UPI payment is processed immediately and a receipt is generated.

4. What if my solar system underperforms?

Check your inverter's generation log first. If generation is below expected output, the cause is typically panel soiling, shading, or an inverter fault — contact your installer for a service check. If your inverter shows higher exports than your bill credits, there may be a metering discrepancy. Raise a complaint with your DISCOM citing both the inverter data and the bill figure. A bi-directional meter accuracy test may be required.

5. How do I claim solar subsidies online?

The PM Surya Ghar subsidy is claimed through the official portal at pmsuryaghar.gov.in after your system is commissioned and the net metering connection is activated. Upload the commissioning certificate, installation photographs, and bank account details through the portal. The subsidy is credited directly to your bank account after DISCOM verification. Do not use third-party channels for this claim.