You installed rooftop solar expecting near-zero electricity bills, but your first post-installation bill arrives—and it’s not zero. Many new solar owners in India feel shocked, frustrated, or even scammed when they see charges persisting. This is common and not a mistake—it’s how net metering works under 2026 DISCOM rules. Learn how to read solar net metering bill, understand fixed charges, import vs export units, and why your electricity bill isn’t zero.

Understanding your bill empowers you to verify accuracy, optimize usage, and achieve maximum savings. This guide provides a visual teardown of a typical 2026 DISCOM solar net metering bill, explains key components like fixed charges (which never disappear), the difference between export and import units, and the annual settlement cycle that can wipe out excess credits.

Thousands of Indian homeowners are surprised when they receive their first electricity bill after installing a rooftop solar system with net metering. Many expect a zero bill, but the reality is more nuanced.

The good news is that this doesn’t necessarily mean your solar system isn’t working. In most cases, your system is performing exactly as expected. The remaining bill is often due to fixed charges, taxes, meter rent, and other components that net metering does not eliminate.

This guide explains every section of a typical 2026 DISCOM electricity bill in simple language. By the end, you’ll understand:

• Why you still receive an electricity bill after installing solar
• How to read import and export units on a net meter
• What fixed charges are and why they remain payable
• How annual settlement affects excess solar credits
• Common billing mistakes and how to identify them
• Practical tips to maximize your savings

Whether you’re a new solar owner or planning to install rooftop solar, this guide will help you interpret your electricity bill with confidence.

Why Your Solar Bill Isn’t Zero After Installation

The solar sales pitch has a structural problem. “Zero bill” is memorable. “Near-zero energy charges plus unavoidable fixed charges minus credits that may partially lapse at year-end” is not. So the first version gets sold, and the second version arrives in your letterbox.

Solar offsets energy charges (the per-unit cost of electricity consumed) through net metering, but it doesn’t eliminate everything. You remain connected to the grid for backup power during nights, monsoons, or low generation periods. DISCOMs charge for this infrastructure and reliability.

Even if your panels generate 100% of the electricity you use, you are still connected to the grid. The DISCOM acts as your giant, free battery—taking your excess daytime power and feeding you power at night. To maintain that infrastructure, they charge a fixed monthly fee based on your “Sanctioned Load.”

Your monthly bill may still include:

• Fixed Charges
• Service Charges
• Meter Rent
• Electricity Duty
• Government Taxes
• Fuel Adjustment Charges (where applicable)
• Other DISCOM-approved charges

Even if your solar panels generate more electricity than you consume during the day, these charges generally remain payable according to your DISCOM’s tariff and applicable regulations.

Understanding / how to read solar Net Metering bill

Net metering is a billing mechanism that allows a rooftop solar system to interact with the electricity grid.

Instead of using separate meters for consumption and generation, a bi-directional (net) meter records electricity flowing in both directions.

Import

Electricity you draw from the grid.

Example:

• Night-time consumption
• Cloudy weather
• High appliance usage beyond solar production

These units are called Import Units.

Export

When your solar system produces more electricity than your home is using, the surplus is automatically sent to the grid.

These are known as Export Units.

Net Consumption

At the end of the billing cycle:

Import Units − Export Units = Net Energy

Depending on your DISCOM’s rules:

• You may pay only for the net imported units.
• Surplus export units may be carried forward to future billing cycles.
• Any remaining credits at the annual settlement may be adjusted or compensated according to the applicable policy.

How Does a Solar Net Meter Work?

Think of your electricity meter as a two-way counter.

During the Day

• Solar panels generate electricity.
• Your home consumes solar power first.
• Extra electricity flows to the grid.
• The meter records these as Export Units.

During the Night

Solar panels stop generating.

Your home now imports electricity from the grid.

The meter records these as Import Units.

At the end of the billing period, your DISCOM calculates the bill using the import and export readings together with applicable tariff components.

How to Read Your 2026 Solar Net Metering Bill (Visual Breakdown)

After receiving your first electricity bill with rooftop solar, it’s easy to feel confused. Instead of a ₹0 bill, you may see multiple charges, import/export readings, and technical terms that are difficult to understand.

The key is knowing what each section means. Once you understand your bill, you can quickly verify whether your solar system and net meter are working correctly.

A Typical 2026 DISCOM Net Metering Bill

Although the layout varies between DISCOMs (such as Tata Power, BSES, MSEDCL, WBSEDCL, BESCOM, TANGEDCO, or UPPCL), most electricity bills contain the same essential information.

—————————————————-
Consumer Number: XXXXXXXX
Billing Period: 01 June – 30 June 2026

Previous Import Reading : 12,450 kWh
Current Import Reading : 12,700 kWh

Import Units : 250 Units

Previous Export Reading : 5,320 kWh
Current Export Reading : 5,740 kWh

Export Units : 420 Units

Net Units : -170 Units (Credit)

—————————————–
Energy Charges : ₹0
Fixed Charges : ₹350
Meter Charges : ₹40
Electricity Duty : ₹58
Fuel Adjustment : ₹22
GST/Other Charges : ₹15

Total Bill : ₹485
————————————–

At first glance, this bill may seem contradictory:

• You exported more electricity than you imported.
• Your energy charge is ₹0.
• Yet, you still owe ₹485.

Section 1: Consumer Information

The top of the bill usually includes:

• Consumer Number
• Account Number
• Billing Cycle
• Tariff Category
• Sanctioned Load
• Meter Number
• Net Meter Number

Why It Matters

Verify that the meter number on the bill matches the physical net meter installed at your property. If the wrong meter is linked to your account, the readings and bill could be incorrect.

Section 2: Billing Period

This shows the dates covered by your bill.

Example: Billing Period

01 June 2026
to
30 June 2026

Your solar generation and grid usage are calculated only for this billing period.

Section 3: Import Reading

This represents electricity taken from the grid.

Example:

Previous Reading = 12,450

Current Reading = 12,700

Import Units

12,700 − 12,450 = 250 Units

What Does This Mean?

These 250 units were supplied by your DISCOM because your home needed electricity when your solar panels weren’t producing enough power, such as:

• At night
• During heavy rain
• On cloudy days
• During high electricity demand

Section 4: Export Reading

This shows electricity sent to the grid by your rooftop solar system.

Example:

Previous Reading = 5,320

Current Reading = 5,740

Export Units

5,740 − 5,320 = 420 Units

What Does This Mean?

Your solar panels produced more electricity than your home consumed.

Instead of wasting this surplus, your inverter exported it to the grid.

The DISCOM records these units as solar credits according to the applicable net metering rules.

Section 5: Net Units Calculation

This is the most important part of the bill.

The formula is:

Net Units = Import Units − Export Units

Example:

Import = 250 Units

Export = 420 Units

Net = 250 − 420

= −170 Units

A negative value means you generated more electricity than you consumed during the billing cycle

Section 6: Energy Charges

Many homeowners immediately check this section.

It represents the cost of electricity consumed from the grid after applying any eligible net metering adjustment.

Example 1

Import = 500 Units

Export = 200 Units

Net Consumption = 300 Units

Energy charges are calculated on 300 units (subject to the applicable tariff structure).

Section 7: Fixed Charges

This is the section that surprises most new solar owners.

Fixed charges are payable regardless of how much electricity you consume because they help cover the cost of maintaining the electricity network and your grid connection.

These charges are generally based on:

• Sanctioned Load (kW)
• Connected Load
• Consumer Category
• DISCOM Tariff

Section 8: Electricity Duty and Other Charges

Besides energy and fixed charges, your bill may include:

• Electricity Duty
• Fuel & Power Purchase Adjustment (FPPA/FAC)
• Meter Rent
• Service Charges
• Customer Charges
• Taxes and Surcharges (as applicable)

These items are governed by your state’s tariff order and applicable regulations.

Fixed Charges Explained

One of the biggest surprises for new rooftop solar owners is seeing a bill even after generating more electricity than they consumed. In most cases, the reason is fixed charges.

Many homeowners assume that solar panels eliminate every component of their electricity bill. In reality, net metering primarily offsets energy charges, while fixed charges and several regulated fees generally continue to apply.

Let’s understand why.

What Are Fixed Charges?

Fixed charges are monthly fees collected by your electricity distribution company (DISCOM) to maintain your connection to the power grid.

Unlike energy charges, which depend on how many units (kWh) you consume, fixed charges are usually based on:

• Your sanctioned load (kW)
• Consumer category (Residential, Commercial, Industrial)
• State Electricity Regulatory Commission (SERC) tariff order
• Applicable DISCOM tariff

You pay these charges even if your monthly electricity consumption is very low because your home remains connected to the grid.

Why Do Fixed Charges Exist?

Think of the electricity grid like a highway.

Even if you don’t drive every day, the roads still need to be maintained. Similarly, the power distribution network must remain available whenever you need electricity.

Your DISCOM continues to invest in:

• Power lines
• Distribution transformers
• Substations
• Meter maintenance
• Customer support
• Grid monitoring systems
• Emergency repair services
• Billing and administrative operations

Fixed charges help recover part of these ongoing costs.

For official state-wise net metering regulations and current APPC settlement rates, always verify with the Ministry of New and Renewable Energy (MNRE).

Solar Import vs Export Meter Reading Explained

One of the most confusing parts of a solar net metering bill is understanding import and export units.

Many new solar owners look at their electricity bill and see two different numbers:

• Import Units
• Export Units

But what do these numbers actually mean?

Understanding these readings is important because they determine how much electricity you pay for and how much solar energy credit you receive.

What Is Solar Import and Export Meter Reading?

A solar net meter is a bi-directional electricity meter that records electricity flowing in two directions:

1. Electricity coming from the grid to your home → Import Units
2. Electricity going from your solar system to the grid → Export Units

Unlike a traditional electricity meter that only records consumption, a net meter works like a two-way counter.

Import Units Explained

What Are Import Units?

Import units are the electricity your home takes from the electricity grid when your solar system is not producing enough power.

The formula is:

Import Units = Current Import Reading − Previous Import Reading

Example:

Previous Import Reading: 12,450 Units

Current Import Reading: 12,700 Units

Calculation:

12,700 − 12,450 = 250 Import Units

This means your home consumed 250 units of electricity supplied by the DISCOM during that billing period.

When Does Your Home Import Electricity?

Your house usually imports electricity during:

Night Hours

Solar panels stop generating electricity after sunset.

Example:

• Lights
• Fans
• Refrigerator
• TV
• AC

All electricity comes from the grid.

Cloudy or Rainy Days

Solar generation reduces during:

• Heavy monsoon
• Cloud cover
• Foggy weather

Your home may automatically draw additional power from the grid.

High Load Usage

If your appliance demand is higher than your solar production:

Example:

Solar Generation: 2 kW

Home Load: 5 kW

Difference: 3 kW imported from the grid

Export Units Explained

What Are Export Units?

Export units are the excess solar electricity sent back to the grid after your home’s immediate electricity needs are fulfilled.

The formula is: Export Units = Current Export Reading − Previous Export Reading

Example:

Previous Export Reading: 5,320 Units

Current Export Reading: 5,740 Units

Calculation: 5,740 − 5,320 = 420 Export Units

This means your solar system exported 420 units of surplus electricity to the grid.

When Does Solar Export Electricity?

Solar export usually happens when:

Solar Generation > Home Consumption

Example: Your rooftop solar system generates: 4 kW

Your home consumes: 1.5 kW

Remaining electricity: 4 − 1.5 = 2.5 kW

This extra power flows into the grid as export energy.

How Your Solar Net Metering Bill Is Calculated

After understanding import and export readings, the next important step is learning how your final electricity bill amount is calculated.

Many solar owners only look at the total amount payable, but the real calculation happens through multiple steps:

1. Electricity imported from the grid is measured.
2. Solar electricity exported to the grid is measured.
3. Export credits are adjusted according to net metering rules.
4. Remaining energy charges are calculated.
5. Fixed charges and other applicable charges are added.

Let’s understand the calculation process.

Solar Net Metering Bill Calculation Formula

The basic formula is: Net Energy Consumption = Import Units − Export Units

Case 1: Import Units Higher Than Export Units

Example:

Monthly Import: 600 Units

Monthly Export: 250 Units

Calculation: 600 − 250 = 350 Units

Your net consumption: 350 Units

You will generally pay energy charges for these net units according to your applicable tariff slab.

Case 2: Export Units Higher Than Import Units

Example:

Import: 200 Units

Export: 450 Units

Calculation: 200 − 450 = -250 Units

This means you have: 250 Units Solar Credit

Your energy charge may become zero.

However, your bill may still include:

• Fixed charges
• Meter charges
• Electricity duty
• Other applicable charges

“Rooftop solar payback calculator” — explain how net billing affects payback

What Happens to Extra Solar Credits?

One of the biggest questions after installing solar is:

“If I generate more electricity than I use, will my extra units disappear?”

The answer depends on your state, DISCOM, and applicable net metering regulations.

What Are Solar Credits?

When your solar system exports electricity to the grid, those exported units are recorded as credits.

Example:

January: Import = 300 Units, Export = 500 Units

Credit: 500 − 300 = 200 Units

These 200 units may be carried forward according to the applicable policy.

Common Billing Errors After Installing Solar

Sometimes a high electricity bill is not because of normal charges. It may happen due to incorrect readings, delayed updates, or meter issues.

Here are the most common problems.

Error 1: Net Meter Not Updated in Billing System

After installation, your physical net meter may be working correctly, but the DISCOM billing system may not yet reflect the solar connection.

Symptoms:

• No export units shown.
• Full electricity bill received.
• Solar credits missing.

Solution:

Contact your DISCOM and verify:

• Net meter approval status.
• Solar commissioning date.
• Meter mapping in billing software.

Error 2: Incorrect Import or Export Reading

Always compare:

• Previous month’s bill reading
• Current meter display
• Inverter generation data

Example:

Inverter Generation: 600 Units

Meter Export: 50 Units

A large mismatch may require inspection.

Error 3: Confusing Total Meter Reading With Monthly Usage

A meter reading is cumulative.

Example:

Current Export Reading: 8,500 Units

Previous Export Reading: 8,000 Units

Monthly Export: 500 Units

Not 8,500 units.

Error 4: Solar Generation Lower Than Expected

A low export reading may happen because of:

• Dust accumulation
• Shading
• Inverter problems
• Loose connections
• Faulty modules
• Seasonal weather changes

Check your inverter monitoring app regularly.

Error 5: Wrong Tariff Category

Your electricity connection should have the correct consumer category.

Examples:

• Domestic
• Commercial
• Industrial

Wrong classification can increase your bill significantly.

Error 6: High Sanctioned Load

A higher sanctioned load may increase fixed charges.

Example:

Required load: 3 kW

Approved load: 10 kW

Your fixed charges may be unnecessarily high.

Frequently Asked Questions (FAQ)