When homeowners install a rooftop solar system, an important question is what happens when the solar panels generate more electricity than the property is using.

This is where net metering can become relevant.

A grid-connected rooftop solar system can generate electricity during the day. Some of that electricity may be consumed immediately by the property. Depending on the applicable electricity regulations and approved metering arrangement, surplus electricity can be exported to the electricity grid.

This guide explains the basic concept of solar net metering, how electricity flows between a home and the grid, what a bidirectional meter does, and what homeowners should understand before applying.

What Is Solar Net Metering?

Solar net metering is a metering arrangement associated with eligible grid-connected rooftop solar systems.

It allows electricity consumption from the grid and electricity exported to the grid to be measured through the applicable metering arrangement.

In simple terms:

Solar Generation → Home Consumption → Surplus Electricity → Grid

When the solar system is generating less electricity than the home requires, electricity can be drawn from the grid.

When solar generation exceeds the property's immediate requirement, surplus electricity may flow to the grid under the applicable arrangement.

The exact rules, eligibility and settlement mechanism depend on the relevant electricity regulations and distribution utility.

Why Is Net Metering Important for Rooftop Solar?

Solar panels generate electricity primarily during daylight hours.

However, a household may consume electricity at different times throughout the day.

For example:

During the Afternoon

Solar generation may be high while household electricity demand is relatively low.

This can result in surplus solar electricity.

During the Evening

Solar generation decreases or stops after sunset, while household electricity consumption may continue.

The property may then draw electricity from the grid.

Net metering provides a way for the applicable metering system to record electricity flowing in both directions.

How Does Solar Net Metering Work?

A simplified rooftop solar setup looks like this:

Solar Panels → Inverter → Home Electrical System ↔ Electricity Grid

The electricity meter records the relevant electricity flow.

Situation 1: Solar Generation Is Lower Than Consumption

Suppose the home is consuming more electricity than the solar system is producing.

The additional electricity can come from the grid.

Situation 2: Solar Generation Is Higher Than Consumption

If the solar system is producing more electricity than the home is currently using, surplus electricity can flow toward the grid where the approved arrangement allows it.

Situation 3: Solar Generation Matches Consumption

The property's solar generation is being consumed by the connected loads, resulting in little or no net electricity flow through the grid connection at that moment.

What Is a Bidirectional Electricity Meter?

A conventional electricity meter primarily measures electricity consumed from the grid.

A rooftop solar connection may use a bidirectional meter capable of measuring electricity flow in both directions according to the applicable metering arrangement.

It can record:

• Electricity imported from the grid
• Electricity exported to the grid

The exact meter type and settlement process depend on the distribution utility and applicable regulations.

What Happens to Excess Solar Electricity?

Excess electricity generated by a rooftop solar system does not necessarily need to be wasted.

Depending on the approved connection and applicable regulations, surplus generation can be exported to the grid.

The distribution utility then records the relevant electricity flow through the approved metering system.

The treatment of exported electricity depends on the applicable regulatory and billing framework.

Who Can Use Solar Net Metering?

Eligibility is not identical for every property or location.

Potential users may include eligible:

• Residential consumers
• Commercial consumers
• Institutional consumers
• Other electricity consumers

The actual eligibility depends on the applicable state regulations, distribution utility, system capacity and connection type.

Therefore, homeowners should check the current requirements with their local electricity distribution company before designing the system around net-metering assumptions.

Where Does Net Metering Apply?

Solar net metering is connected to the electricity distribution system serving the property.

The process can therefore vary between:

• States
• Distribution companies
• Consumer categories
• System capacities
• Connection types

This means that information found for one state or electricity distribution company should not automatically be assumed to apply everywhere in India.

When Should You Apply for Net Metering?

If your rooftop solar system is intended to use an approved grid-connected metering arrangement, it is important to understand the applicable process before finalizing the installation.

Depending on the utility and project, the process can involve steps such as:

Application → Document Submission → Technical Review → Installation → Inspection/Approval → Metering → Commissioning

The exact sequence can vary.

How to Apply for a Rooftop Solar Connection?

The process depends on the local distribution utility and applicable rooftop-solar program.

A typical process may involve:

Step 1: Check Eligibility

Confirm whether your electricity connection and proposed solar system qualify under the applicable rules.

Step 2: Submit the Application

Submit the required rooftop solar or metering application through the applicable utility process.

Step 3: Provide Documents

The utility may require relevant consumer, property and technical information.

Step 4: Technical Review

The proposed system may undergo a technical evaluation according to the utility's requirements.

Step 5: Install the Solar System

Once the applicable process permits installation, the rooftop system can be installed according to the approved requirements.

Step 6: Inspection or Verification

The distribution utility may inspect or verify the installation.

Step 7: Metering Arrangement

The applicable meter can be installed or configured.

Step 8: Commissioning

After completion of the required process, the rooftop solar system can be commissioned under the approved arrangement.

What Documents May Be Required?

Requirements vary by utility, but applicants may be asked for information such as:

• Electricity consumer details
• Electricity bill
• Identity information
• Property information
• Solar system specifications
• Inverter details
• Installation documents
• Technical documents
• Bank/payment information where applicable

Always check the current document checklist provided by your electricity distribution company.

How Does Net Metering Affect Your Electricity Bill?

A rooftop solar system can reduce the amount of electricity a consumer needs to purchase from the grid by generating electricity on-site.

The bill treatment depends on the applicable metering and settlement arrangement.

A simplified example:

Suppose during a billing period:

Grid Import = 500 units

and

Eligible Grid Export = 150 units

The applicable billing mechanism determines how those measured quantities are treated.

The final payable amount cannot be calculated simply by subtracting units in every case because tariff structures, fixed charges, taxes, fees and applicable settlement rules may also affect the bill.

Does Net Metering Mean Your Electricity Bill Becomes Zero?

Not necessarily.

Installing solar does not automatically mean every electricity bill will become zero.

Depending on the tariff and applicable billing arrangement, a customer may still have:

• Fixed charges
• Minimum charges
• Taxes
• Service charges
• Other applicable fees
• Electricity consumption not offset by solar generation

Therefore, homeowners should evaluate the complete electricity bill structure rather than assuming that solar automatically eliminates every charge.

What Happens at Night?

Solar panels generally do not produce useful electricity after sunset.

If the property does not have sufficient battery storage, electricity can be supplied from the grid.

For a typical grid-connected rooftop system:

Daytime → Solar Generation

Night → Grid Electricity

Battery-based systems can operate differently depending on their configuration.

What Happens During a Power Cut?

A standard grid-connected solar system should not automatically be assumed to provide backup electricity during a grid outage.

This is an important distinction.

Many conventional grid-connected inverters are designed to disconnect from the grid when grid power is unavailable.

If backup power is required, the system may need an appropriate battery-based or backup-capable configuration.

The exact capability depends on the equipment and system design.

Net Metering vs Battery Storage

These are two different concepts.

A homeowner may use one approach or a combination depending on the system design and applicable rules.

What Is the Difference Between Net Metering and Gross Metering?

These terms should not be treated as identical.

Net Metering

The applicable system measures electricity imported from and exported to the grid, with settlement according to the relevant rules.

Gross Metering

Under a gross-metering arrangement, electricity generated by the solar system can be measured separately and treated according to the applicable regulatory mechanism.

The availability and terms of these arrangements depend on the relevant regulations and utility.

What Should You Check Before Installing Rooftop Solar?

Before purchasing equipment, ask:

1. Is my electricity connection eligible?
2. Which distribution company serves my property?
3. What metering arrangement is currently available?
4. What solar capacity is permitted?
5. What application process applies?
6. What documents are required?
7. Is an inspection required?
8. What meter will be installed?
9. How will exported electricity be settled?
10. Are there fixed charges or other charges on the bill?
11. What happens during a grid outage?
12. Do I need battery backup?

Getting these details confirmed before installation can prevent misunderstandings later.

Common Net Metering Mistakes

Mistake 1: Assuming Net Metering Is Identical Across India

Rules and procedures can vary by state and distribution utility.

Mistake 2: Assuming Every Solar System Can Export Electricity

Grid export requires the applicable approved connection and metering arrangement.

Mistake 3: Assuming Solar Provides Backup During Power Cuts

A standard grid-connected system should not automatically be treated as a backup system.

Mistake 4: Ignoring Fixed Charges

Solar generation can reduce electricity purchases, but other applicable charges may remain.

Mistake 5: Installing the System Before Understanding the Utility Process

The required application, technical and metering procedures should be understood before finalizing the project.

Mistake 6: Relying on Old Information

Solar regulations and utility procedures can change.

Always verify current requirements before submitting an application or making a major investment.

Solar Net Metering Checklist

Before applying for a rooftop solar connection, check:

• ✅ Electricity distribution company identified
• ✅ Consumer category confirmed
• ✅ Current eligibility checked
• ✅ Available metering arrangement confirmed
• ✅ Proposed solar capacity calculated
• ✅ Roof assessed
• ✅ Solar system design prepared
• ✅ Required documents collected
• ✅ Application submitted through the applicable process
• ✅ Technical requirements understood
• ✅ Metering process confirmed
• ✅ Commissioning requirements understood

Frequently Asked Questions

What is solar net metering?

Solar net metering is a grid-connected metering arrangement that measures relevant electricity imported from and exported to the electricity grid according to applicable rules.

Can excess solar electricity be sent to the grid?

It can be, where the applicable grid connection and metering arrangement permits electricity export.

Does net metering store solar electricity?

No. Net metering measures electricity flow; it does not physically store electricity. Batteries perform the storage function.

Does net metering work at night?

The solar panels generally do not generate electricity at night. A grid-connected property can draw electricity from the grid when solar generation is unavailable, subject to its connection arrangement.

Does net metering provide backup during a power cut?

Not automatically. A standard grid-connected solar system may shut down during a grid outage. Backup requires an appropriate system configuration.

Can every homeowner get net metering?

Eligibility depends on the applicable regulations, electricity distribution utility, consumer category, system capacity and other requirements.

Does solar net metering eliminate the electricity bill?

Not necessarily. The final bill depends on electricity consumption, solar generation, applicable tariffs, fixed charges and the relevant settlement mechanism.

Should I install a battery with net metering?

It depends on your goals. A battery may be useful when backup power or energy storage is important, while a grid-connected system may operate without battery storage.

Conclusion

Solar net metering is an important concept for homeowners considering a grid-connected rooftop solar system.

It allows the applicable electricity-metering arrangement to account for electricity flowing between the property and the grid. Solar electricity can first serve the property's electrical loads, while surplus electricity may be exported where permitted.

However, net-metering rules, eligibility, capacity limits, application procedures and settlement mechanisms can vary by location and electricity distribution utility.

Before installing a rooftop solar system, homeowners should therefore verify the current requirements with their local distribution company and understand how the proposed system will interact with the electricity grid.

A good rooftop solar decision should consider not only the solar panels, but also system capacity, electricity consumption, metering arrangement, inverter configuration, backup requirements and applicable electricity charges.