Installing a rooftop solar system in Bihar can significantly reduce the amount of electricity a home or eligible consumer purchases from the grid. But what happens when your solar panels generate more electricity than you are using at that moment?

This is where net metering becomes important.

Net metering allows electricity generated by a grid-connected rooftop solar system to be consumed by the property, while surplus electricity can be exported to the electricity distribution network according to the applicable regulatory framework. The electricity meter records the relevant import and export flows, allowing the consumer’s bill to reflect the net energy position under the applicable rules.

In Bihar, rooftop solar and metering are governed by the Bihar Electricity Regulatory Commission (BERC) framework. BERC lists the Rooftop Solar Grid Interactive Systems Based on Net and Gross Metering Regulations, 2018, along with subsequent amendments.

The state’s regulatory position is also evolving. In 2026, BERC has considered matters specifically concerning net-metering arrangements for domestic rooftop solar under the PM Surya Ghar Muft Bijli Yojana, including proposals relating to charges and implementation for eligible consumers.

This guide explains how net metering works for rooftop solar in Bihar, how electricity flows between your home and the grid, the role of the DISCOM, and what you should check before installing solar panels.

What Is Net Metering for Rooftop Solar?

Net metering is a billing arrangement for eligible grid-connected solar consumers.

Your rooftop solar panels generate electricity during the day. That electricity can first serve the property’s electricity demand.

If your solar generation is greater than your immediate consumption, the surplus can flow to the electricity grid, subject to the approved system and applicable regulations.

When your solar system is not generating enough electricity—for example, at night—you can draw electricity from the grid.

A simplified flow looks like this:

Solar panels → Home/business → Surplus electricity → Grid

and when solar generation is insufficient:

Grid → Home/business

The meter records the relevant electricity flows so that billing can be calculated according to the applicable net-metering rules.

BERC’s rooftop solar regulations provide for eligible consumers to install rooftop solar under net or gross metering arrangements, subject to the applicable requirements and permissible capacity.

How Does Net Metering Work in Bihar?

The process can be understood through four basic situations.

1. Solar Generation Is Lower Than Your Consumption

Suppose your home is using 4 kWh of electricity while your rooftop solar system is producing 2 kWh.

The solar system supplies approximately 2 kWh, while the remaining 2 kWh comes from the grid.

In simple terms:

4 kWh consumption − 2 kWh solar generation = 2 kWh grid import

2. Solar Generation Matches Consumption

If your home is consuming 3 kWh and your solar system is producing approximately 3 kWh at the same time, your electricity requirement can be met by the solar generation, subject to system operation and instantaneous conditions.

3. Solar Generation Exceeds Consumption

Suppose your solar system generates 5 kWh while your property is consuming 3 kWh.

The surplus 2 kWh may flow into the grid under the approved net-metering arrangement.

4. Solar Panels Are Not Generating

At night, solar panels generally do not generate electricity.

Your property can therefore draw electricity from the grid.

This makes a grid-connected rooftop solar system different from an off-grid system with battery storage.

What Is a Net Meter?

A net meter is an electricity meter designed to measure electricity flowing between the consumer’s premises and the grid in accordance with the applicable metering arrangement.

Instead of looking only at electricity consumed from the grid, the system can account for electricity exported from the rooftop solar installation.

The exact meter configuration, approval process, technical requirements and billing treatment depend on the applicable Bihar regulations and DISCOM procedures.

Therefore, consumers should not purchase a meter independently based on an online recommendation. The applicable electricity distribution company and approved process should determine the metering requirements.

Why Is Net Metering Important for Rooftop Solar?

Without an appropriate grid-connected arrangement, surplus electricity generated by a rooftop solar system may not provide the same economic benefit as electricity consumed directly on-site.

Net metering can help eligible consumers make better use of their solar generation by accounting for electricity exported to the grid under the applicable regulatory framework.

This is particularly relevant for homes that generate substantial solar electricity during daylight hours but continue to consume electricity at other times.

For example, a family may generate considerable solar power between 10 AM and 3 PM but use more electricity in the evening.

The grid effectively remains part of the electricity system, while the approved metering arrangement accounts for the relevant energy flows.

What Happens to Excess Solar Electricity?

When your rooftop solar system generates more electricity than your property is consuming at a particular moment, the surplus may be exported to the distribution network.

The financial treatment of that exported electricity depends on the applicable metering arrangement and regulations.

This is an important distinction:

Exporting electricity does not automatically mean that every exported unit is paid to the consumer at the same retail electricity tariff.

The applicable regulations determine how imported and exported electricity are accounted for.

Therefore, before signing a solar installation contract, ask the installer to explain the current Bihar-specific metering and settlement mechanism applicable to your connection.

Net Metering vs Gross Metering

Net metering and gross metering are not the same.

Net Metering

Under net metering, electricity generated by the rooftop system can be used by the consumer, while electricity imported from and exported to the grid is measured according to the applicable arrangement.

The billing mechanism is based on the applicable net-metering rules.

Gross Metering

Under gross metering, electricity generated by the rooftop solar system is measured separately and the treatment of generated electricity follows the applicable gross-metering framework.

BERC’s regulatory framework specifically covers both net and gross metering for rooftop solar grid-interactive systems.

The right arrangement depends on the consumer category, project design, applicable regulations and current DISCOM procedures.

Who Can Use Net Metering in Bihar?

Eligibility depends on the applicable BERC regulations, amendments, consumer category, system capacity, connection conditions and DISCOM requirements.

BERC’s rooftop solar framework states that it applies to distribution licensees and eligible electricity consumers in Bihar. It also provides that eligible consumers may install rooftop solar under net or gross metering, subject to the permissible rated capacity and other conditions.

Therefore, it is better to confirm eligibility for your particular electricity connection rather than assuming that every consumer automatically qualifies.

What Is the Role of Bihar DISCOMs?

The electricity distribution company, or DISCOM, plays an important role in connecting a rooftop solar system to the electricity network.

Depending on the project, the process can involve:

• Application submission
• Technical assessment
• Approval
• Solar installation
• Inspection
• Metering
• Grid synchronization
• Documentation
• Commissioning

Bihar’s electricity distribution system includes different DISCOM service areas, so the exact procedure can depend on where your property is located.

A professional solar installer can assist with documentation and coordination, but consumers should understand that final approvals and metering remain subject to the applicable DISCOM and regulatory requirements.

How Does Net Metering Affect Your Electricity Bill?

Consider a simplified example.

Suppose during one billing period:

• Electricity imported from the grid = 350 units
• Electricity exported to the grid = 200 units

If the applicable net-metering rules allow those quantities to be offset in the relevant manner, the net energy position would be:

350 − 200 = 150 units

This is a simplified illustration and should not be treated as the exact billing calculation for every Bihar consumer.

Your actual bill can include fixed charges, demand-related charges, taxes, fees and other applicable components depending on your consumer category and tariff.

Therefore, installing solar does not necessarily mean every component of an electricity bill becomes zero.

Does Net Metering Mean a Zero Electricity Bill?

Not necessarily.

This is one of the most important points homeowners should understand.

A rooftop solar system can significantly reduce electricity consumption from the grid, but the final electricity bill depends on the applicable tariff structure and charges.

Your bill may contain elements such as:

• Energy charges
• Fixed charges
• Demand charges, where applicable
• Taxes or duties
• Other regulatory charges

Therefore, a responsible solar company in Bihar should avoid promising that every customer will automatically receive a zero bill.

Instead, ask for an estimated annual electricity saving based on your actual consumption.

How Does Net Metering Work With PM Surya Ghar?

Net metering is especially relevant to residential consumers considering the PM Surya Ghar Muft Bijli Yojana.

MNRE’s current rooftop solar programme provides information on residential rooftop solar, subsidy/CFA and the national portal process. It states that the consumer pays the balance amount after the applicable subsidy/CFA to an empanelled vendor after successful installation and verification by the State DISCOM.

Bihar is also actively dealing with implementation questions related to net metering under PM Surya Ghar. In July 2026, BERC listed proceedings concerning net-metering arrangements for domestic rooftop solar under the scheme, including a petition concerning waiver of application and meter-testing charges.

This means consumers should check the latest official Bihar and DISCOM procedures rather than relying on older online articles.

What Is the Net Metering Application Process?

While the exact process can change, a typical rooftop solar workflow involves several stages.

Step 1: Check Eligibility

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

Step 2: Apply Through the Applicable Portal or DISCOM Process

Residential PM Surya Ghar applicants may use the national rooftop solar mechanism, while other projects may follow applicable DISCOM procedures.

Step 3: Technical Assessment

The DISCOM may assess the proposed system and grid connection requirements.

Step 4: Select an Eligible Installer

Where government programme requirements apply, use the applicable empanelled/vendor mechanism.

Step 5: Install the Solar System

The rooftop solar system is installed according to the approved specifications.

Step 6: Inspection and Verification

The relevant authorities may verify the installation and technical requirements.

Step 7: Meter Installation or Configuration

The approved metering arrangement is completed according to the applicable process.

Step 8: Commissioning

After the required approvals and technical checks, the system is connected for regular operation.

The exact sequence and documentation requirements should be confirmed through the relevant official portal and DISCOM.

What Should You Check Before Applying for Net Metering?

Before installing rooftop solar, check:

Electricity Connection

Make sure your consumer details and electricity connection information are accurate.

Sanctioned Load

Confirm whether the proposed solar capacity is compatible with the applicable requirements.

Roof Area

Ensure sufficient space is available without excessive shading.

System Capacity

Choose the capacity based on electricity consumption rather than subsidy alone.

Metering Rules

Understand whether net or another approved metering arrangement applies.

Installation Vendor

For PM Surya Ghar, verify the applicable vendor eligibility.

Documentation

Keep electricity bills, consumer details, identity documents and property-related information ready where required.

Does a Solar Battery Change Net Metering?

A battery can change how electricity is used within the property, but it does not automatically change the applicable regulatory requirements.

For example, a hybrid solar system can store excess solar electricity during the day and use it later.

A homeowner might therefore use:

Solar → Home

then:

Solar → Battery

and later:

Battery → Home

Depending on the system design, grid electricity may also be imported when necessary.

If a battery is being considered alongside a grid-connected rooftop solar system, ask the installer how the proposed configuration interacts with the applicable metering and interconnection requirements.

How Can Net Metering Improve Solar Savings?

The economic benefit of rooftop solar generally improves when more solar generation can be effectively utilized.

A homeowner can improve self-consumption by using energy-intensive appliances during daylight hours when practical.

For example:

• Run washing machines during the day
• Operate water pumps during solar-generation hours
• Charge suitable devices during daylight
• Use daytime cooling loads when solar production is available

This can reduce reliance on grid electricity without requiring all excess solar generation to be exported.

What Should You Ask a Solar Installer?

Before choosing a solar panel installation Bihar provider, ask:

1. Is my electricity connection eligible for net metering?
2. What system capacity is permitted?
3. Which metering arrangement applies to me?
4. Who handles the DISCOM application?
5. Is the application included in the installation quotation?
6. Who handles inspection and commissioning?
7. What meter will be installed?
8. What happens to surplus electricity?
9. Are there any application or meter-testing charges?
10. What happens if regulations change?
11. What documents do I need?
12. What after-sales support will you provide?

Getting these answers in writing can prevent confusion later.

How Can ZRN Solar Help With Rooftop Solar?

When selecting a solar company in Bihar, customers should look for a provider that understands both the technical and administrative sides of rooftop solar.

ZRN Solar can be considered by homeowners and businesses evaluating rooftop solar installation, system sizing and related solar project requirements in Bihar.

Before proceeding, customers should request a detailed site survey, electricity-consumption assessment, equipment specifications, installation quotation and explanation of the applicable net-metering process.

Because regulatory requirements can change, the final metering arrangement should always be confirmed through the relevant DISCOM and BERC requirements.

Conclusion

Net metering is an important part of grid-connected rooftop solar in Bihar because it determines how electricity flowing between your solar system, property and the grid is measured and treated for billing.

During the day, your solar panels can supply electricity to your property. If generation exceeds your immediate consumption, surplus electricity may be exported to the grid under the applicable arrangement. When your solar system is not producing enough electricity, you can draw power from the grid.

Bihar’s rooftop solar framework is governed by BERC regulations covering net and gross metering, while current 2026 proceedings show that implementation details for domestic rooftop solar under PM Surya Ghar continue to receive regulatory attention.

For this reason, homeowners should avoid relying on outdated articles or assumptions about net metering solar Bihar. Confirm the latest rules, charges, system-capacity requirements and DISCOM procedures before installation.

If you are planning rooftop solar in Bihar, start with an electricity-bill analysis and professional site survey. Compare the complete installation proposal, understand how surplus electricity will be treated, and confirm the metering process before signing your contract.

Frequently Asked Questions