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Net Metering vs Net Accounting vs Net Plus: A Guide to Sri Lankan Rooftop Solar

When connecting a rooftop photovoltaic (PV) system to the national grid, the billing arrangement dictates your financial return. In Sri Lanka, the Ceylon Electricity Board (CEB) and Lanka Electricity Company (LECO) administer three primary schemes: Net Metering, Net Accounting, and Net Plus.

Choosing the wrong scheme can significantly impact your payback period. This article explains how each arrangement works, their import and export treatment, payment mechanics, and eligibility criteria under current regulations effective as of 2026.

The Landscape of Grid-Connected Solar in Sri Lanka

To maximize savings from a solar installation, consumers must understand the distinction between these billing mechanisms. While all three schemes allow you to generate electricity on-site, they differ fundamentally in how surplus energy is credited back to your account.

• Net Metering: Credits for consumption offset; excess generation usually has no monetary value.
• Net Accounting: Allows for separate accounting of imports and exports at different rates.
• Net Plus: Offers incentives for exporting power, often with higher feed-in tariffs.

The following sections detail the mechanics of net metering Sri Lanka arrangements compared to the newer financial models available under CEB/LECO frameworks.

How Net Metering Works (The Traditional Scheme)

Net Metering is the foundational scheme for rooftop solar in Sri Lanka. Under this arrangement, a bidirectional meter tracks both energy imported from the grid and energy exported back into it.

Import and Export Treatment

• Import: You are billed for electricity drawn from the grid when your solar panels do not produce enough power (e.g., at night).
• Export: When your system generates more than you consume, the meter spins backward. However, under standard Net Metering rules, no payment is made for the excess electricity supplied over consumption.

Payment Mechanics

The credit generated from exporting energy is typically used to offset future imports. This creates a 1:1 offset ratio. If your system produces more than you use in a billing cycle, that surplus does not generate cash value; it simply resets your meter balance to zero for the next period or carries over as a credit until fully utilized.

Eligibility and Terms

• Eligibility: Residential and commercial consumers connected to CEB/LECO distribution lines.
• Agreement Term: Typically 20 years.
• Best For: Homes with high daytime consumption where the goal is self-consumption rather than revenue generation from surplus power.

How Net Accounting Works (The Hybrid Model)

Net Accounting offers a more granular approach to billing, separating the cost of imported electricity from the credit for exported electricity. This scheme is often preferred by businesses or large residential users who can optimize their load profiles.

Import and Export Treatment

Unlike Net Metering, Net Accounting assigns specific tariff rates to imports and exports.

• Import Rate: Charged at the standard CEB/LECO retail tariff applicable to your consumer category (Domestic, Commercial, etc.).
• Export Rate: You receive a credit for exported power, but this rate is generally lower than the import rate.

Payment Mechanics

The billing statement will show two distinct line items: one for energy purchased from the grid and one for energy sold back. The net cost is calculated as (Import Cost) - (Export Credit). Because the export rate is usually lower than the retail tariff, this scheme can be less profitable than Net Plus but more transparent than Net Metering regarding surplus value.

Eligibility and Terms

• Eligibility: Available to consumers who opt for separate metering arrangements or specific CEB/LECO connection categories.
• Agreement Term: Usually 20 years, subject to regulatory changes.
• Best For: Users who want to understand the exact financial value of their exported energy without a premium feed-in tariff.

How Net Plus Works (The Incentive Scheme)

Net Plus is designed to encourage higher levels of solar penetration by providing financial incentives for exporting power to the grid. This scheme is often associated with specific government or utility initiatives to boost renewable adoption.

Import and Export Treatment

• Import: Charged at standard retail tariffs.
• Export: You receive a premium rate for exported energy, significantly higher than the Net Accounting export rate. This makes selling surplus power financially viable.

Payment Mechanics

Under Net Plus Solar Sri Lanka rules, the utility pays you directly for your excess generation. The cash flow calculation is: (Export Quantity × Premium Export Rate) - (Import Quantity × Import Rate). This structure allows consumers to monetize their solar system even when it exceeds their own consumption needs.

Eligibility and Terms

• Eligibility: Often subject to specific capacity limits or application windows opened by CEB/LECO.
• Agreement Term: Long-term contracts, typically 20 years.
• Best For: Users with high daytime generation who wish to monetize their surplus power rather than just offsetting bills.

Comparison of Billing Schemes

The following table summarizes the critical differences between the three schemes for a typical rooftop PV installation in Sri Lanka.