Imagine opening your monthly electricity bill and discovering that instead of paying the electricity department, your bill shows -₹11. Sounds unbelievable, right?
Most people believe that installing rooftop solar only reduces electricity bills. But what if your bill actually becomes negative, meaning you don't have to pay anything for that billing cycle and you still have credit remaining?
That is exactly what happened after I installed a 1kW rooftop solar system under the PM Surya Ghar Muft Bijli Yojana. In this article, I will share my official May 2026 TPNODL electricity bill, explain how net metering works, and show you every calculation with real numbers.
If you're planning to install rooftop solar—or you've already installed one—this guide will help you understand how electricity billing, carry-forward units, imports, exports, and credits actually work.
 |
| My Electricity Bill Became -₹11 After Installing 1kW PM Surya Ghar Solar Real TPNODL Net Meter Bill Explained (2026 Guide) - PSP STUDIO ODIA |
📑 Table of Contents
- Overview of My 1kW Solar System
- How Net Metering Works
- Official TPNODL Bill Overview
- Import vs Export Explained
- Carry Forward Units
- Why My Bill Became -₹11
- Key Lessons
- Frequently Asked Questions
My Rooftop Solar Installation
I installed a 1kW ULA Model Rooftop Solar System under the Government of India's PM Surya Ghar Muft Bijli Yojana.
The objective was simple:
- Reduce monthly electricity expenses
- Take advantage of rooftop solar generation
- Understand how Net Metering actually works
- Track real savings using official electricity bills
After the first billing cycle, I noticed encouraging savings. However, the second month's bill turned out to be even more surprising.
✔ Electricity Bill = -₹11
✔ Net Billable Units = 0
✔ Carry Forward Units Increased
✔ No Electricity Payment Required
How Net Metering Works
Before looking at the bill, let's quickly understand how Net Metering works.
When sunlight falls on your rooftop solar panels, electricity is generated during the daytime.
Your home always uses this solar electricity first.
If your house consumes less electricity than the solar panels generate, the surplus electricity automatically flows back into the electricity grid.
The Net Meter records electricity flowing in both directions.
| Meter Reading | Meaning |
|---|---|
| Import | Electricity taken from the grid. |
| Export | Extra solar electricity supplied to the grid. |
At the end of the billing period, these values are adjusted according to the applicable Net Metering regulations.
How Does a 1kW Solar System Perform?
Many homeowners ask whether a 1kW rooftop solar system is enough for daily household use.
The answer depends on your electricity consumption pattern.
Under normal weather conditions in Odisha, a properly installed 1kW rooftop solar system can typically generate around:
| Period | Average Generation* |
|---|---|
| Per Day | Approximately 4–5 Units |
| Per Month | Approximately 100–120 Units |
*Actual generation depends on weather, panel orientation, shading, season, and system efficiency.
For homes using:
- LED Lights
- 3–4 Ceiling Fans
- One Refrigerator
- Television
- Wi-Fi Router
- Mobile Charging
A 1kW system can significantly reduce electricity imported from the grid.
 |
| Real TPNODL Net Meter Bill Explained (2026 Guide) - PSP STUDIO ODIA |
Official TPNODL Bill Overview
Now let's move to the most exciting part.
Instead of discussing theory, we'll analyze an actual electricity bill issued by TPNODL after installing rooftop solar.
This is my second monthly bill (May 2026).
The bill contains several important sections:
- Import Units
- Export Units
- Opening Carry Forward
- Closing Carry Forward
- Net Billable Units
- Security Deposit Interest
- Demand Charge
- Total Payable Amount
Many solar consumers ignore these fields, but understanding them helps you verify whether your bill has been calculated correctly.
Why This Bill Is Special
This bill demonstrates several important concepts that every rooftop solar owner should understand:
- How imported electricity is measured.
- How exported solar energy is recorded.
- How surplus units are carried forward.
- How previous credits affect future bills.
- Why your final payable amount may become zero—or even negative in some cases due to applicable credits and adjustments.
A negative bill amount does not necessarily mean the electricity company pays you cash. It generally indicates that credits or adjustments exceed the current payable amount, subject to the applicable billing rules and regulations.
 |
| MY MAY MONTH BILL TPNODL -11 RUPEES - PSP STUDIO ODIA |
What You'll Learn in the Next Section
In Part 2, we'll decode the actual bill line by line using real meter readings.
You'll learn:
- How I imported only 63 units from the grid.
- How I exported 76.69 units back to TPNODL.
- Why exporting more than importing is beneficial under net metering.
- How carry-forward units accumulate over time.
- Why my billed units became zero.
Live TPNODL Bill Analysis (May 2026)
Now let's analyze the most important section of the electricity bill using the actual readings from my May 2026 TPNODL Net Meter bill.
This is where many rooftop solar users get confused. Fortunately, once you understand these numbers, reading any Net Meter bill becomes very easy.
Bill Highlights
- Billing Month: May 2026
- Solar Capacity: 1 kW
- DISCOM: TPNODL
- Billing Type: Net Metering
Step 1: Import Units (Electricity Taken From the Grid)
The first value to check is the Import Reading.
Import means the electricity you purchased from the electricity grid whenever your rooftop solar system could not meet your home's electricity demand.
| Description | Reading |
|---|---|
| Previous Import Reading | 1462 |
| Current Import Reading | 1525 |
| Total Imported Units | 63 Units |
Calculation:
1525 − 1462 = 63 Units
This means that during the entire month, I purchased only 63 units of electricity from TPNODL.
When Do Import Units Increase?
Import units mainly increase:
- During the night.
- On cloudy or rainy days.
- When household demand exceeds solar generation.
- During periods of high electricity consumption.
Even if you have rooftop solar, importing some electricity is perfectly normal because solar panels only generate electricity when sunlight is available.
Step 2: Export Units (Electricity Sent to the Grid)
Now let's look at the export reading.
Export units represent the surplus solar electricity that your home did not consume and was automatically sent back to the electricity grid.
| Description | Reading |
|---|---|
| Previous Export Reading | 77.51 |
| Current Export Reading | 154.20 |
| Total Exported Units | 76.69 Units |
Calculation:
154.20 − 77.51 = 76.69 Units
This means my rooftop solar system exported 76.69 units of surplus electricity to the TPNODL grid during May 2026.
What Makes This Bill Interesting?
Now compare the two values.
| Energy Flow | Units |
|---|---|
| Imported From Grid | 63 Units |
| Exported To Grid | 76.69 Units |
Notice something interesting?
I exported more electricity than I imported.
Let's calculate the difference.
Monthly Surplus Energy
76.69 − 63.00 = 13.69 Units
This means I generated enough surplus solar electricity to offset all my imported electricity and still had 13.69 units remaining.
Opening Carry Forward Units
This is another section that many rooftop solar users overlook.
In my previous month's bill (April 2026), I had already accumulated surplus solar credits.
| Description | Units |
|---|---|
| Opening Carry Forward | 36.51 Units |
These units were already available in my Net Meter account before the May billing cycle started.
Closing Carry Forward Units
Now let's combine both values.
| Description | Units |
|---|---|
| Opening Carry Forward | 36.51 |
| Current Month Surplus | 13.69 |
| Closing Carry Forward | 50.20 Units |
Calculation:
36.51 + 13.69 = 50.20 Units
These units are not lost. They remain available in the billing system and can be adjusted against eligible future imports according to the applicable net metering regulations.
Carry Forward Units are one of the biggest advantages of Net Metering. Instead of wasting excess daytime solar generation, eligible surplus energy is carried forward for future adjustment as per the applicable regulations and billing cycle.
Why Did My Billed Units Become Zero?
Because:
- I imported only 63 Units.
- I exported 76.69 Units.
- I already had 36.51 Carry Forward Units.
- The billing system adjusted the eligible exported units according to the applicable net metering rules.
As a result, my electricity bill showed:
Billed Units = 0.00
However, having zero billed units does not automatically mean your final payable amount will also be zero, because fixed charges and other applicable adjustments may still apply.
Why Did My Electricity Bill Become -₹11?
This is probably the most surprising part of my entire rooftop solar journey.
Many people assume that if their Net Billable Units become zero, then their final bill will also be exactly ₹0.
However, my official TPNODL bill showed something even more interesting.
Final Bill = -₹11.00
No payment required for this billing cycle.
Let's understand how this happened.
Reason 1: Previous Billing Adjustment
In the previous billing cycle (April 2026), my electricity bill was approximately ₹12. However, I had already paid around ₹20.
Since I paid more than the payable amount, the excess payment remained available as an adjustment in my account.
This credit was automatically considered during the next billing cycle.
Reason 2: Security Deposit Interest
Many consumers are unaware that the electricity distribution company generally pays interest on the eligible Security Deposit maintained with the utility, subject to applicable rules.
In my bill, I received:
| Description | Amount |
|---|---|
| Interest on Security Deposit (SD) | ₹30.31 |
This amount was credited directly in my electricity bill.
Many consumers completely ignore the "Interest on Security Deposit" entry printed on their electricity bill. Reviewing your bill carefully each year helps you verify such adjustments.
How Did These Adjustments Result in -₹11?
Let's simplify the calculation.
| Adjustment | Approximate Effect |
|---|---|
| Previous Excess Payment | Adjusted |
| Security Deposit Interest | ₹30.31 Credit |
| Current Fixed Charges | Adjusted Against Credit |
| Final Result | -₹11.00 |
Because the available credits exceeded the payable amount for that billing cycle, the final bill showed a negative balance.
Does a Negative Electricity Bill Mean the Utility Pays You Cash?
No.
A negative bill generally means your account has more credit than the current payable amount after applicable adjustments. The treatment of this credit depends on the DISCOM's billing system and applicable regulations.
Always refer to your electricity bill and the applicable regulations for exact billing treatment.
Understanding Demand Charge (MMFC)
This is another area where many rooftop solar consumers become confused.
Even if your energy charges become zero, you may still see fixed charges on your electricity bill.
In my bill:
| Charge | Amount |
|---|---|
| Demand Charge / MMFC | ₹40 |
In the previous month, this fixed charge was lower. The amount can vary depending on tariff revisions, sanctioned load, and applicable regulations.
Why Are Fixed Charges Still Applicable?
Many people believe rooftop solar completely eliminates electricity bills.
That is not always true.
Even if your rooftop solar system generates sufficient electricity to offset most or all of your energy consumption, certain regulated charges may still apply.
- Fixed Charges
- Demand Charges
- Meter-related Charges (where applicable)
- Electricity Duty (depending on regulations)
- Other statutory charges
These charges are determined according to your electricity tariff and applicable regulations.
Rooftop solar mainly reduces the energy component of your bill. Some fixed charges may continue even when your net energy consumption is very low.
What I Learned After Two Months of Using a 1kW Rooftop Solar System
After using my rooftop solar system for two billing cycles, I observed several practical benefits:
- My monthly electricity bill reduced significantly.
- Surplus solar energy accumulated as Carry Forward Units.
- The electricity generated during the daytime covered a major portion of my household consumption.
- The billing process was transparent through the Net Meter.
- The official bill clearly reflected imports, exports, and adjustments.
Who Should Install a 1kW Rooftop Solar System?
A 1kW rooftop solar system is generally suitable for households with moderate electricity consumption.
Typical appliances may include:
| Appliance | Suitable? |
|---|---|
| LED Lights | ✔ Yes |
| 3–4 Ceiling Fans | ✔ Yes |
| Refrigerator | ✔ Yes |
| Television | ✔ Yes |
| Wi-Fi Router | ✔ Yes |
| Laptop Charging | ✔ Yes |
Under favorable sunlight conditions, a 1kW rooftop solar system can typically generate around 100–120 units of electricity per month, although actual generation depends on weather, system performance, shading, and location.
How Carry Forward Units Benefit You
One of the biggest financial advantages of Net Metering is that eligible surplus units are not immediately wasted.
If you generate more electricity than you consume during a billing cycle, those surplus units can be carried forward according to the applicable regulations and adjusted against future eligible imports.
This makes rooftop solar especially beneficial for households whose daytime solar generation exceeds daytime consumption.
Key Takeaway
My real-life experience demonstrates that even a 1kW rooftop solar system can substantially reduce electricity bills for households with moderate energy usage. Understanding imports, exports, carry-forward units, and fixed charges helps consumers interpret their bills accurately.
Frequently Asked Questions (FAQs)
1. Can a 1kW rooftop solar system really reduce my electricity bill to zero?
It depends on your monthly electricity consumption, the amount of solar energy generated, your daytime usage pattern, weather conditions, and the applicable net metering regulations. For homes with relatively low electricity usage, a 1kW system can significantly reduce monthly bills.
2. Why did my bill become negative (-₹11)?
In this real example, the negative balance resulted from a combination of:
- Zero net billable units after adjustments.
- Credit from the previous billing cycle.
- Interest credited on the Security Deposit.
- Applicable billing adjustments by the DISCOM.
A negative amount generally indicates that your available credits exceeded the payable amount for that billing cycle.
3. What are Carry Forward Units?
Carry Forward Units are surplus eligible solar units that remain available for adjustment in future billing cycles according to the applicable net metering regulations. They help reduce future electricity bills if you later import more electricity from the grid.
4. Will I receive money for exported electricity every month?
Not necessarily. Under the applicable net metering regulations, exported electricity is generally adjusted against imported electricity. The exact settlement process depends on your DISCOM's rules and the prevailing regulations.
5. Why do fixed charges still appear even when my energy bill is zero?
Fixed charges such as Demand Charges (MMFC), meter-related charges, and other statutory charges may still apply depending on your tariff category and the applicable electricity regulations.
6. How many units can a 1kW rooftop solar system generate each month?
Under favorable sunlight conditions, a well-installed 1kW rooftop solar system in Odisha typically generates around 100–120 units per month. Actual generation varies with season, weather, shading, panel orientation, and maintenance.
Key Learnings From This Real Bill
| Learning | Explanation |
|---|---|
| Import Units | Electricity purchased from the grid. |
| Export Units | Surplus solar electricity supplied back to the grid. |
| Carry Forward Units | Unused eligible credits adjusted in future billing cycles. |
| Net Billable Units | Units considered for billing after applicable adjustments. |
| Negative Bill | Usually indicates credits exceeded the current payable amount. |
| Fixed Charges | May continue even if energy charges are very low or zero. |
Official Government Resources
Always verify subsidy details, regulations, and billing information using official sources.
- PM Surya Ghar Muft Bijli Yojana
- Ministry of New and Renewable Energy (MNRE)
- Odisha Electricity Regulatory Commission (OERC)
- TPNODL Official Website
Expert Tips to Maximize Your Solar Savings
- Use high-power appliances during daylight hours whenever possible.
- Clean your solar panels regularly to maintain peak generation.
- Monitor your inverter's mobile app or web portal to track daily generation.
- Review every monthly electricity bill carefully and verify import/export readings.
- Keep commissioning certificates, subsidy records, and installation invoices safely for future reference.
- Schedule periodic maintenance to ensure long-term system performance.
Final Verdict
This real TPNODL electricity bill demonstrates that rooftop solar can substantially reduce household electricity expenses when the system is properly sized and the household's electricity consumption matches the system's generation profile.
In this case, the 1kW rooftop solar system:
- Reduced electricity imported from the grid.
- Generated surplus electricity for export.
- Accumulated carry forward units.
- Reduced net billable units to zero.
- Combined with billing adjustments and Security Deposit interest, resulted in a final bill of -₹11.
Bottom Line
If your home's monthly electricity consumption is around 100–120 units and you maximize daytime self-consumption, a 1kW rooftop solar system under the PM Surya Ghar Muft Bijli Yojana can deliver excellent savings while supporting clean energy generation.
Disclaimer
This article is based on a real electricity bill example for educational and informational purposes. Electricity billing varies depending on the DISCOM, tariff category, applicable regulations, billing period, and future policy updates. Always refer to your official electricity bill and consult your electricity distribution company for case-specific clarification.
About PSP Studio
PSP Studio publishes practical guides on rooftop solar, PM Surya Ghar Muft Bijli Yojana, electricity bills, net metering, government schemes, and consumer awareness. Every guide is designed to simplify technical topics using real-world examples and verified information.
🌞 Thank You for Reading!
If this guide helped you understand how rooftop solar billing works, consider sharing it with your friends and family who are planning to install solar under the PM Surya Ghar Muft Bijli Yojana.
Knowledge shared today can help someone save on electricity bills tomorrow.
Post a Comment