Net Metering Explained: How to Earn Money by Selling Power to Your DISCOM
For decades, our relationship with the electricity company has been a one-way street: they supply the power, and we pay the steadily increasing bills. But what if you could flip the script? What if, instead of just being a consumer, you became a “prosumer”—someone who not only consumes electricity but also produces it, and even sells the surplus back to the grid?
Thanks to rapid advancements in solar technology and progressive government initiatives like the PM Surya Ghar Muft Bijli Yojana, this is now a reality for millions of households across India. The secret mechanism that makes this financial transformation possible is a system known as Net Metering.
If you have recently installed a solar rooftop system or are planning to get one, understanding this concept is absolutely critical to maximizing your return on investment. In this comprehensive guide, Net Metering Explained: How to Earn Money by Selling Power to Your DISCOM, we will break down the technical jargon, explain how the billing works, and show you exactly how you can turn your roof into a revenue-generating asset.
What is Net Metering? A Simple Definition
Net metering is an electricity billing mechanism that allows consumers who generate some or all of their own electricity to use that electricity anytime, instead of when it is generated. It is essentially a trade agreement between you and your local electricity distribution company (DISCOM).
When you install an on-grid solar power system, it is connected directly to the local power grid. Because solar panels only generate electricity during the day when the sun is shining, your home might produce more power than it actually consumes at that specific moment (for instance, when everyone is away at work or school).
Without net metering, this valuable excess energy would simply go to waste. With net metering, however, this surplus electricity is automatically exported (sent back) to the DISCOM’s grid. In return, the DISCOM gives you “credits” for every unit of electricity you give them.
How the Process Works: The Bi-Directional Meter
To make this system work, your standard, old-school electricity meter is replaced with a smart, Bi-Directional Meter (also known as a Net Meter). While a traditional meter only spins forward to count the electricity you buy, a bi-directional meter measures power flowing in two opposite directions.
1. Daytime Generation (Exporting Power)
On a bright, sunny afternoon, your solar panels are working at peak capacity. Let us say your home is currently consuming 2 units of power to run the fridge and some fans, but your panels are generating 5 units. The system automatically routes 2 units to power your home, and the remaining 3 units are exported to the grid. The net meter records this as a “+3 Export Credit”.
2. Nighttime Consumption (Importing Power)
At night, your solar panels go to sleep, but your electricity needs continue. You turn on the lights, the television, and the air conditioners. Since you aren’t generating solar power, you pull electricity from the main grid, just like you normally would. The net meter records this as an “Import”.
3. The Monthly Billing Cycle
At the end of the month, the DISCOM meter reader checks your bi-directional meter. Your final electricity bill is calculated using a very simple formula:
Net Bill = Total Units Imported from Grid MINUS Total Units Exported to Grid
If you imported 300 units at night but exported 250 units during the day, you will only pay for the net difference of 50 units. If you exported more than you imported, your bill drops to zero!
How to Actually “Earn Money” from Your DISCOM
Getting a zero electricity bill is fantastic, but the title of this guide promised to explain how to earn money. Here is how the financial settlement works in India.
Banking Your Surplus Units
In months with excellent sunshine (like April or May), your system might produce significantly more power than you consume. Let’s say you consume 300 units but generate 400 units. You now have a surplus of +100 units.
The DISCOM does not pay you cash immediately at the end of the month. Instead, they “bank” these 100 units and carry them forward to your next month’s bill, much like rolling over unused mobile data. This banked power is incredibly useful during monsoon months (July/August) when solar generation drops, but your consumption remains high.
The Annual Financial Settlement
In India, the net metering cycle usually follows the financial year (April 1st to March 31st). At the end of the financial year, the DISCOM looks at your annual account ledger.
If, over the entire 12-month period, you have exported more electricity than you imported, the DISCOM will financially compensate you for the remaining surplus units. The money is transferred directly into your linked bank account.
Understanding the APPC Rate
It is important to set realistic expectations here. The DISCOM will not pay you the retail rate (e.g., ₹7 or ₹8 per unit) that they charge you. Instead, they pay you at the Average Pooled Purchase Cost (APPC) rate or a feed-in tariff determined by your State Electricity Regulatory Commission (SERC).
This rate varies by state but generally hovers between ₹2.50 to ₹3.50 per unit.
Example: If you have an annual surplus of 1,000 units at the end of March, and your state’s APPC rate is ₹3.00, you will receive a cash payout of ₹3,000 from the government/DISCOM.
Net Metering vs. Gross Metering: What is the Difference?
While researching solar installations, you might come across the term “Gross Metering.” It is vital to understand the difference, as net metering is vastly more beneficial for residential consumers.
- Net Metering: You consume your solar power first, and only the surplus goes to the grid. You save money by avoiding the high retail tariff (e.g., ₹8/unit) you would normally pay to the DISCOM.
- Gross Metering: Every single unit of solar power you generate is exported directly to the grid at a fixed feed-in tariff (e.g., ₹3/unit). Meanwhile, you buy all the electricity you consume for your house at the standard retail rate (e.g., ₹8/unit).
For residential setups under the PM Surya Ghar scheme, Net Metering is the standard and the most profitable model, as saving an ₹8 unit is always better than selling a ₹3 unit.
How to Apply for a Net Meter
The process of getting a net meter is deeply integrated into your overall rooftop solar application. Here is the general workflow under the national portal:
- Application & Feasibility: You apply for a solar installation on the PM Surya Ghar portal. The DISCOM checks if their local transformer can handle the extra load from your roof (Technical Feasibility Approval).
- Installation: Your empaneled vendor installs the panels and the standard inverter.
- Net Meter Application: Once the panels are up, you (or your vendor) submit the installation completion report on the portal and formally apply for the net meter testing and installation.
- Inspection & Fee: You will pay a nominal fee for the net meter (usually between ₹1,500 to ₹3,000, depending on the state). DISCOM officials will visit your home, inspect the safety of the wiring, and install the physical bi-directional meter.
- Commissioning: The meter is sealed, your system goes live, and your billing cycle officially switches to the net metering format.
Frequently Asked Questions (FAQs)
To ensure this guide on Net Metering Explained: How to Earn Money by Selling Power to Your DISCOM is complete, let’s address some common queries:
1. Do I need to buy the Net Meter myself?
Usually, the DISCOM provides the net meter to ensure it meets their strict calibration and safety standards. You just pay the requisite fee through the portal. In some states, consumers are allowed to buy their own meters from approved vendors, but it must pass lab testing by the DISCOM first.
2. Does net metering work during a power cut?
No. Standard on-grid solar systems with net metering are designed to shut down completely during a grid power failure. This is an essential safety feature called “Anti-Islanding.” It prevents your solar panels from sending live electricity into the grid wires while linesmen are trying to repair them.
3. Is the money earned from selling surplus solar power taxable?
For regular residential consumers, the small payouts received at the end of the year from surplus solar generation are generally considered capital receipts meant to offset the cost of the system, and are not typically taxed as business income. However, it is always best to consult a local tax advisor if your earnings are substantial.
4. Will the DISCOM change my tariff slab if I install a net meter?
Your consumer category (domestic residential) remains the same. In fact, because your net imports from the grid will drop significantly, you will likely fall into a lower, cheaper tariff slab for the minimal electricity you do end up buying from them.
Conclusion
The transition from a passive consumer to an active energy producer is one of the most empowering financial decisions a household can make. Net metering is the vital bridge that makes rooftop solar a highly lucrative investment rather than just a green vanity project.
By leveraging net metering, you are not just shielding yourself against the relentless inflation of utility bills; you are turning your unused roof space into an active asset. You lock in decades of free electricity, build a bank of surplus power for high-usage months, and even enjoy a small year-end bonus for your contribution to the national grid. If you haven’t yet explored the benefits of the PM Surya Ghar Yojana, there has never been a better time to calculate your roof’s potential and embrace the future of energy!