Gross Metering

What Is Gross Metering?

Gross metering is a billing arrangement for grid-connected solar plants in which 100% of the electricity generated is exported to the DISCOM grid through a dedicated unidirectional export meter. The plant owner does not consume any solar power on-site. Instead, the DISCOM pays for every kilowatt-hour exported at a Feed-in Tariff (FiT) notified by the State Electricity Regulatory Commission (SERC). Simultaneously, the consumer continues to purchase all electricity consumed from the grid at the normal retail tariff.

In regulatory terms, gross metering is defined as a connection arrangement where the consumer’s renewable energy generator connects through a separate meter measuring total energy injected into the distribution network, compensated at a tariff determined by the appropriate Commission under the Electricity Act 2003.

Gross metering sits alongside net metering and net billing as the three primary grid-connection billing models for distributed solar in India. It is the least common of the three for self-consuming consumers but serves specific use cases where net metering is infeasible or suboptimal:

• Capacity above net-metering caps: Most states cap net metering at 500 kW or 1 MW. Systems above this threshold must use gross metering or open access.
• Very low daytime consumption: Warehouses, parking structures, or buildings with minimal daytime load may find gross metering simpler than tracking self-consumption.
• Third-party ownership (RESCO/OPEX): When a solar developer installs on a third-party roof and sells power to the DISCOM rather than to the building occupant, gross metering provides a clean revenue structure.
• Investor preference for revenue certainty: Some investors prefer a fixed FiT revenue stream over the variable savings from net metering, particularly when retail tariff structures are complex or unstable.

For most residential solar consumers and self-consuming businesses, net metering produces substantially better economics. Gross metering becomes relevant primarily for large commercial rooftops, industrial campuses, and third-party investment structures.

Why Gross Metering Matters

Understanding gross metering is essential for three reasons:

1. Regulatory navigation: India’s distributed solar policy landscape is fragmented across states, with each SERC defining its own net metering, gross metering, and net billing rules. A consumer or developer who does not understand these distinctions may choose a suboptimal arrangement costing lakhs of rupees over the project life.

2. Large-scale rooftop economics: As commercial and industrial rooftop solar scales beyond 500 kW, gross metering becomes a necessary option to evaluate. The choice between gross metering, net billing, and open access determines project structure, financing, and returns.

3. Policy evolution tracking: Several states have shifted from net metering to net billing or gross metering for larger systems as DISCOMs face revenue erosion from high solar penetration. Understanding gross metering helps stakeholders anticipate and adapt to policy changes.

Key impacts include:

• Revenue predictability: The FiT is fixed in a 20-25 year PPA, insulating the investor from retail tariff volatility and net-metering policy changes.
• Administrative simplicity: No need to track self-consumption ratios, banking periods, or surplus settlement rules. One meter, one tariff, one payment.
• Third-party investment enablement: RESCO and OPEX models rely on gross metering to create separable revenue streams independent of the host consumer’s electricity usage.
• DISCOM revenue protection: By paying a lower FiT than the retail tariff, gross metering reduces the financial impact on DISCOMs compared to 1:1 net metering.
• Large rooftop monetization: Gross metering enables solarization of roofs that would otherwise remain unused due to net-metering capacity caps.

Important: Heaven Green Energy evaluates net metering, net billing, and gross metering for every commercial and industrial project above 100 kW, ensuring clients select the optimal structure for their consumption profile and regulatory environment.

How Gross Metering Works

The gross metering operational workflow involves parallel but independent energy and cash flows:

Energy flow:

1. Solar generation: PV panels produce DC electricity converted to AC by a grid-tied inverter.
2. Export metering: All AC output passes through a unidirectional export meter that records total generation injected into the DISCOM grid.
3. Grid injection: The solar power flows into the DISCOM distribution network through the consumer’s service connection.
4. Consumption: The building or facility draws all required electricity from the DISCOM grid through the existing import meter, exactly as before solar installation.

Cash flow:

1. Solar revenue: The DISCOM reads the export meter monthly and pays the plant owner at the contracted FiT (e.g., Rs 3.20/kWh) for all units generated.
2. Electricity expense: The consumer pays the DISCOM for all electricity consumed, measured by the import meter, at the applicable retail tariff (e.g., Rs 9.50/kWh).
3. Separate settlement: The two transactions are independent. The solar revenue does not offset the electricity bill. Some states net the two on a single statement; others issue separate payments and bills.

Example calculation:

A logistics warehouse in Ahmedabad installs a 250 kWp rooftop solar plant under Gujarat’s gross metering framework:

• Annual solar generation: 375,000 kWh (1,500 kWh/kW/year at Gujarat GHI)
• GERC-notified FiT: Rs 3.15/kWh
• Annual solar revenue: Rs 11,81,250

The warehouse consumes 480,000 kWh annually at an average retail tariff of Rs 9.20/kWh:

• Annual electricity bill: Rs 44,16,000

Net annual position: The warehouse pays Rs 44,16,000 for electricity and receives Rs 11,81,250 for solar. The solar provides a 26.7% reduction in net energy costs. Under net metering (if allowed), the same plant would offset consumption worth Rs 34,50,000, nearly 3x the gross metering value.

This example illustrates why gross metering is economically inferior for self-consuming facilities but may still be viable when net metering is unavailable.

Visual Explanation

Real-World Example

Scenario: A cold storage facility in Banaskantha, Gujarat has a 2,000 sq m roof with excellent solar exposure but minimal daytime electricity consumption (refrigeration compressors run 24/7, but the facility’s connected load is only 75 kW).

Challenge: The facility owner wants to monetize the roof but cannot justify net metering because self-consumption is low and the system size (400 kW potential) exceeds Gujarat’s net-metering cap considerations for the connection type.

Gross metering solution:

1. System sizing: 400 kW rooftop solar using Tier-1 545 Wp mono PERC modules.
2. Gross metering application: Submitted to PGVCL with GEDA coordination. Approved under Gujarat Solar Policy 2021 gross metering provisions.
3. PPA execution: 25-year PPA signed at GERC-notified FiT of Rs 3.10/kWh (2026 rate).
4. Installation: Completed by a GEDA-empanelled EPC contractor in 15 working days.
5. Export meter: PGVCL installs unidirectional meter within 30 days of commissioning.

Financial outcome:

• Annual generation: 600,000 kWh
• Annual solar revenue: Rs 18,60,000
• Project CAPEX: Rs 1.80 crore (Rs 45,000/kW)
• Payback period: 9.7 years (without tax benefits)
• With accelerated depreciation (40% in Year 1): Effective payback drops to 6.5 years
• 25-year cumulative revenue: Rs 4.65 crore (undiscounted)

Alternative considered: Net billing at Rs 3.50/kWh export tariff would have generated Rs 21,00,000 annually, 13% higher. However, Gujarat’s net billing framework was not yet operational for this category at the time of application.

Lesson: Gross metering enabled roof monetization where net metering was infeasible. While not optimal, it provided a viable investment return and transformed an unused asset into a revenue generator.

Technical Specifications / Benchmarks

Note: FiT figures are indicative and change with each SERC tariff order. Always verify current rates before financial modeling. Because the DISCOM application workflow also differs by state, it helps to review a state-by-state breakdown of the DISCOM net metering process before choosing between net and gross metering for a specific project.

Benefits / Advantages

• Predictable revenue stream: The fixed FiT, locked in a 20-25 year PPA, eliminates exposure to retail tariff volatility and net-metering policy changes.
• Simple administration: One export meter, one tariff, one payment cycle. No tracking of self-consumption ratios, banking periods, or annual settlements.
• Third-party investment structure: RESCO and OPEX developers can install on third-party roofs with a clean DISCOM-facing revenue stream, separate from the host’s electricity consumption.
• Above-capacity solution: Enables solar installation on large roofs where net metering caps would otherwise prohibit connection.
• DISCOM relationship preservation: By paying a below-retail FiT, gross metering reduces the revenue erosion that makes DISCOMs resistant to distributed solar.
• No consumption risk: Revenue does not depend on the building’s electricity usage patterns. A vacant building still generates solar revenue.
• Straightforward financing: Banks can underwrite a fixed FiT revenue stream more easily than variable net-metering savings, particularly for non-recourse project finance.
• Tax benefit eligibility: Commercial and industrial gross-metered projects qualify for accelerated depreciation (40% in Year 1) and GST input credit, improving post-tax returns.
• Renewable Energy Certificates (RECs): Some gross-metering arrangements allow REC registration and sale, creating an additional revenue stream.
• Scalability: Large rooftops (1-5 MW) can be fully utilized without consumption-based sizing constraints.

Limitations / Drawbacks

• Inferior economics for self-consumers: Every solar unit earns Rs 3 under gross metering instead of saving Rs 8-12 under net metering. The opportunity cost is massive for facilities with daytime load.
• Fixed FiT erosion: The FiT does not escalate with inflation in most states. Over 25 years, a fixed Rs 3/kWh loses purchasing power while retail tariffs rise.
• No PM Surya Ghar subsidy: Residential gross-metered systems are ineligible for central CFA, removing up to Rs 78,000 of subsidy support.
• Payment delays: DISCOMs in some states delay FiT payments by 3-6 months, straining developer cash flows.
• No consumption offset: The consumer pays full retail tariff for all electricity used. There is no bill reduction, only a separate revenue stream.
• Lock-in risk: 20-25 year PPAs lock both parties into terms that may become unfavorable if technology costs fall or policy evolves.
• Feeder capacity constraints: Over-sizing without DISCOM feeder reinforcement leads to inverter clipping and curtailment, destroying returns.
• Merchant project treatment: Some banks classify gross-metering projects as merchant power (selling to utility) rather than captive consumption, affecting loan terms and DSCR requirements.
• Net billing competition: As states adopt net billing (self-consumption + fixed export tariff), gross metering becomes less attractive for mid-size systems.
• Regulatory uncertainty: SERCs periodically revise gross metering FiTs downward, creating risk for projects in development.

Comparison Section

For most residential and self-consuming commercial consumers, net metering remains optimal. Gross metering serves specific niches: very low daytime load, above-capacity systems, and third-party investment structures.

Applications

• Large commercial rooftops: Shopping malls, warehouses, and logistics centers with roof area exceeding consumption needs use gross metering to monetize excess capacity.
• Industrial sheds with intermittent operations: Factories running single shifts or seasonal operations may have low daytime load relative to roof potential.
• RESCO/OPEX investments: Third-party developers install on host roofs and sell 100% output to the DISCOM under gross metering, paying the host a roof lease.
• Government building solarization: Schools, colleges, and panchayat buildings with low daytime consumption but large roof areas.
• Parking structure solar canopies: Car parks generate minimal on-site consumption but offer extensive solar mounting area.
• Agricultural buildings: Cold storage, warehouses, and processing units with seasonal electricity demand.
• Utility-scale distributed solar: Multiple rooftop installations aggregated under a single gross metering PPA structure.
• Solar parks on private land: Small ground-mount systems (up to 1-2 MW) connecting at distribution voltage under gross metering where open access is not viable.
• Community solar pilots: Shared solar installations where no single subscriber has sufficient consumption to justify net metering.
• Backup power + revenue: Hybrid systems with battery backup for critical loads, with excess generation exported under gross metering.

Industry Standards & Regulations

Gross metering in India operates within a multi-layered regulatory framework:

• Electricity Act 2003: Provides the legal basis for SERCs to determine tariffs and connection conditions for renewable generators.
• State SERC Net/Gross Metering Regulations: Each state’s regulatory commission issues specific regulations defining eligibility, capacity limits, FiTs, and settlement procedures. Key regulations include GERC (Gujarat), MERC (Maharashtra), TNERC (Tamil Nadu), KERC (Karnataka), and DERC (Delhi).
• CEA Connectivity Regulations 2019: Technical standards for grid interconnection, safety, and power quality applicable to all grid-connected solar plants.
• MNRE Rooftop Solar Programme Phase-II: Central guidelines permitting both net and gross metering, leaving tariff and eligibility details to states.
• IEC 61215 / IEC 61730: Module design qualification and safety standards.
• IEC 62109: Inverter safety standards.
• IS 16444: Smart meter specifications for export metering.
• ALMM Listing: Mandatory for modules in government-subsidized or tender-based projects.
• CEA Technical Standards: Grid code compliance, anti-islanding protection, and power quality requirements.

Important: Heaven Green Energy’s policy team monitors all SERC tariff orders and GERC notifications to advise clients on the optimal metering arrangement before project commitment.

India-Specific Context

India’s distributed solar metering landscape has evolved significantly:

• Early phase (2010-2015): Net metering was the dominant and often only option. Generous 1:1 credit structures drove rapid rooftop adoption in states like Gujarat and Tamil Nadu.
• Transition phase (2016-2020): As solar penetration grew, DISCOMs faced revenue erosion. Several states (Andhra Pradesh, Uttar Pradesh) imposed caps, reduced credit values, or suspended net metering approvals.
• Current phase (2021-2026): A three-tier structure is emerging:
  • Net metering for residential and small C&I (up to 10-100 kW)
  • Net billing for mid-size C&I (100 kW - 1 MW)
  • Gross metering / open access for large C&I and utility-scale (above 1 MW)
• Gujarat context: GERC has maintained relatively stable net metering up to 1 MW while offering gross metering as an alternative for larger systems. The Gujarat Solar Policy 2021 explicitly provides for both arrangements.
• DISCOM resistance: DISCOMs in financially stressed states (Maharashtra, Tamil Nadu) have pushed for gross metering or net billing to protect their revenue base. This trend is likely to continue.
• Consumer advocacy: Solar industry associations and consumer forums actively lobby for preserving net metering for small consumers while accepting gross metering for large installations.
• Future direction: Expect further SERC moves toward net billing as the default for new commercial installations, with net metering reserved for residential and small C&I.

Future Trends

• Net billing dominance: Most states will likely transition new commercial projects to net billing (self-consumption + fixed export tariff) by 2027, reducing gross metering to above-cap and third-party structures.
• Time-of-day FiTs: SERCs may introduce time-differentiated gross metering FiTs, paying higher rates for solar exported during peak demand hours (evening) to align with grid needs.
• Peer-to-peer trading: Blockchain-enabled peer-to-peer energy markets may allow gross-metered generators to sell directly to neighboring consumers at negotiated rates, bypassing the fixed FiT.
• Aggregator models: Solar aggregators may pool multiple small gross-metered rooftops into virtual power plants, negotiating better FiTs through scale.
• Green tariff integration: Gross-metered generators may receive premium green tariffs from corporate buyers seeking renewable energy credits, supplementing the base FiT.
• Battery-enhanced gross metering: Adding battery storage allows gross-metered plants to shift export to high-value evening hours, potentially earning time-of-day premiums.
• Standardized PPAs: Central agencies (SECI, NVVN) may introduce standardized gross metering PPAs to reduce transaction costs and legal uncertainty.
• Digital settlement: Automated smart contract-based settlement using DISCOM meter data may reduce payment delays and disputes.

Common Mistakes & Misconceptions

1. Treating gross metering as default for large rooftops: Many states now allow net metering up to 1 MW. Always verify the latest SERC cap before assuming gross metering is required.
2. Sizing against building load: Gross-metered plants should be sized to roof area, generation potential, and FiT economics, not to consumption. The building does not use the solar power directly.
3. Skipping net billing comparison: Net billing often provides better economics than gross metering for mid-size systems. Model both before deciding.
4. Underestimating the FiT-retail gap: Over 25 years, the gap between a fixed Rs 3/kWh FiT and rising retail tariffs (Rs 8-12/kWh today, potentially Rs 15-20/kWh in 2045) compounds into massive opportunity cost.
5. Ignoring FiT degression: Some states reduce FiTs annually for new projects. Lock in rates before announced reductions.
6. Forgetting feeder infrastructure: Over-sizing without DISCOM feeder reinforcement leads to curtailment, clipping, and destroyed returns.
7. Confusing FiT with LCOE: The FiT is what you are paid; LCOE is what the power costs to produce. Positive spread is required for viability.
8. Not budgeting for export meter costs: DISCOMs charge Rs 5,000-15,000 for unidirectional export meter installation, often overlooked in project budgets.
9. Assuming residential gross metering qualifies for subsidy: PM Surya Ghar CFA is structured for net-metered residential systems. Gross-metered residential projects forfeit central subsidy.
10. Neglecting PPA payment security: Some DISCOMs delay FiT payments. Include late payment penalties and escrow mechanisms in the PPA where possible.

Key Takeaways

• Gross metering exports 100% of solar generation to the DISCOM grid at a fixed Feed-in Tariff, with the consumer buying all electricity at retail tariff separately.
• It is rarely the best option for consumers with significant daytime self-consumption, where net metering provides 2-3x better economics.
• Gross metering becomes relevant for systems above state net-metering caps, buildings with very low daytime load, and third-party RESCO/OPEX investment structures.
• Typical Indian gross metering FiTs range from Rs 2.50 to Rs 4.00 per kWh, set by state SERCs through tariff orders.
• A 25-year PPA locks the FiT, providing revenue predictability but no inflation protection.
• Payback periods range from 7-10 years for commercial gross-metered systems, improving to 5-7 years with accelerated depreciation.
• PM Surya Ghar subsidies do not apply to gross-metered residential systems.
• Most states are moving toward net billing as the default for new commercial installations, with gross metering reserved for specific use cases.
• Heaven Green Energy evaluates net metering, net billing, and gross metering for every commercial and industrial project to optimize client returns.
• Always verify current SERC tariff orders, capacity caps, and DISCOM feasibility before committing to any metering arrangement.

Frequently Asked Questions

What is gross metering in simple terms? Gross metering means all electricity your solar plant produces goes to the grid, and you get paid a fixed rate for it. You do not use your own solar power directly. You continue buying all electricity you consume from the DISCOM at the regular retail tariff, and receive a separate payment for the solar units you exported.

How is gross metering different from net metering? Under net metering, you use solar power first and export only surplus, credited 1:1 against grid consumption. Under gross metering, 100% of solar generation is exported at a fixed Feed-in Tariff, usually lower than retail tariff. You buy and sell electricity at two different rates.

What is the Feed-in Tariff under gross metering in India? The FiT varies by state and project size. Typical residential and small commercial rates in 2026 fall in the range of Rs 2.50 to Rs 4.00 per kWh, set by the State Electricity Regulatory Commission. Larger projects bid into competitive auctions through SECI or state nodal agencies.

Who should choose gross metering instead of net metering? Gross metering suits cases where the rooftop owner has very low daytime consumption, where system size exceeds the state net-metering cap (commonly 500 kW or 1 MW), or where the investor is a third party such as a RESCO operator selling power to the grid rather than to the building.

Is gross metering allowed in all Indian states? Most states allow gross metering as an option, but FiT and eligibility rules differ. Maharashtra, Gujarat, Tamil Nadu, and Karnataka publish their own gross metering tariffs through their SERCs. Some states reserve gross metering for capacities above the net-metering ceiling.

What meter is used for gross metering? A unidirectional export meter is installed at the solar inverter output to record all generation sent to the grid. The DISCOM also keeps the existing import meter at the service connection, which continues recording household or factory consumption separately.

Can I switch from gross metering to net metering later? In most states, switching the metering arrangement after commissioning requires a fresh application to the DISCOM, a new feasibility study, and a meter swap. The change is allowed but not automatic, and DISCOMs may impose a minimum lock-in period under the original PPA or tariff order.

Are there subsidies under PM Surya Ghar for gross-metered systems? PM Surya Ghar Central Financial Assistance is structured around net metering for residential systems up to 10 kW. Gross-metered residential installations are generally not covered. Commercial and industrial gross-metered projects rely on accelerated depreciation and GST input credit for tax benefits.

Does gross metering give better ROI than net metering? Almost never, for consumers with significant daytime self-consumption. Gross metering pays around Rs 3 per unit, while net metering offsets electricity bought at Rs 8 to Rs 12 per unit. The two arrangements only become comparable when the building has minimal daytime load.

What happens to gross-metered solar power during a grid outage? Like all standard grid-tied systems, a gross-metered solar plant shuts down within milliseconds of a grid outage. The inverter has anti-islanding protection to keep workers on the line safe. Power is restored only after the grid returns.

Is a PPA required for gross metering? Yes. A Power Purchase Agreement between the solar plant owner and the DISCOM is signed at the gross-metering tariff. The PPA typically runs for 20 to 25 years and locks the FiT for the duration, protecting both sides from tariff changes.

What is the typical payback period for a gross-metered rooftop solar plant? At a FiT of Rs 3 to Rs 4 per unit and current CAPEX of around Rs 45,000 to Rs 55,000 per kW for commercial-scale rooftops, payback runs 7 to 10 years. With accelerated depreciation, the effective payback drops to 5 to 7 years for taxable entities.

What is net billing and how does it differ from gross metering? Net billing is a hybrid: you self-consume solar power first, and surplus is exported at a fixed export tariff (not 1:1 credit). It sits between net metering (1:1 credit) and gross metering (100% export). Net billing is increasingly replacing gross metering for mid-size systems.

Can residential consumers opt for gross metering? Technically yes in most states, but it is rarely advisable. Residential consumers typically have significant daytime load (AC, appliances) that makes net metering far more valuable. Gross metering is designed for commercial, industrial, and third-party investor scenarios.

How does gross metering affect my electricity bill? You receive two separate statements: a normal electricity bill for all consumption at retail tariff, and a separate credit/payment for all solar generation at the FiT. The two do not offset each other on a single bill in most states.

Related Glossary Terms

• Net Metering
• Feed-in Tariff (FiT)
• DISCOM
• Power Purchase Agreement (PPA)
• Renewable Energy Certificate (REC)
• Open Access Solar
• ALMM
• Anti-Islanding
• PM Surya Ghar
• Accelerated Depreciation
• CAPEX Model
• OPEX Model
• GERC
• CERC
• Time of Day Tariff

Related Resources

• Net Metering in India
• PM Surya Ghar Complete Guide
• OPEX vs CAPEX Solar Models
• Solar Payback Period
• Commercial Solar Solutions
• Solar Calculator

Sources & References

• State SERC Net Metering and Gross Metering Regulations (GERC, MERC, TNERC, KERC, DERC)
• CEA Connectivity Regulations 2019
• MNRE Rooftop Solar Programme Phase-II Guidelines
• Electricity Act 2003 and Amendments
• GERC Tariff Orders for Solar Power
• SECI Solar Tender Documents and PPA Templates
• CERC Terms and Conditions for Tariff Determination

Authored by Amit Sharma, Solar Policy Analyst (8+ years in renewable energy consulting). Reviewed by Dr. Priya Desai, Ph.D. Solar Photovoltaics, IIT Bombay, 15+ years R&D experience.