1. Overview of LESCO Net Metering & Green Meter
Solar Net Metering is a regulatory billing mechanism authorized by the National Electric Power Regulatory Authority (NEPRA) that allows grid-connected solar power producers—referred to as "prosumers"—to feed excess electricity back into the Lahore Electric Supply Company (LESCO) grid. When your rooftop solar PV system produces more electricity during peak sunshine hours than your household or business consumes, the surplus energy flows outward into the local power grid.
To record this two-way movement of energy, LESCO replaces your standard digital or electromechanical single-phase/three-phase utility meter with a Specialized Bi-Directional Smart Meter, commonly known in Pakistan as the "Green Meter" or AMI (Advanced Metering Infrastructure) Meter. This device keeps precise track of two primary billing metrics:
Energy Import (Off-Peak & Peak)
The electricity units (kWh) your property draws from the LESCO grid during times when solar output is insufficient or absent (e.g., at night, during heavily overcast days or when power demand exceeds solar generation capacity).
Energy Export
The solar units (kWh) generated by your PV system that exceed your immediate operational load and are sent into the LESCO neighborhood grid.
At the end of every monthly billing cycle, LESCO reconciles exported units against the imported units. Net metering can help you convert your roof space into a localized energy production facility that can substantially lower your monthly electricity bills. This is a long-term financial security against rising utility tariffs in Lahore, Kasur, Okara and Sheikhupura.
2. NEPRA REGULATORY FRAMEWORK AND SYSTEM SIZING RULES
Net metering in Pakistan is regulated under the NEPRA Alternative & Renewable Energy (ARE) Distributed Generation Regulations. System owners must meet the regulatory requirements for grid capacities, sanction limits and the credentials of the installer while applying to LESCO.
General Eligibility Criteria
- Sanctioned Load Limit: The proposed capacity of the inverter of your solar PV system shall not exceed the sanctioned load of your latest monthly LESCO bill. For example, if the sanctioned load of your connection is 10 kW, then the maximum size of inverter that you can install is 10 kW.
- Three-Phase Connection Requirement: Net metering is generally restricted to 3-phase electrical connections. Single-phase consumers must apply for a 3-phase meter upgrade alongside or prior to initiating the net metering paperwork.
- System Size Boundaries: Distributed generation capacity limits for net metering range from 1 kW up to 1 MW (1000 kW) for residential, commercial and industrial connections.
- AEDBA / PEC Certified Installers: Applications are only accepted if the installation and technical single-line diagram (SLD) are executed and stamped by an Alternative Energy Development Board (AEDB / PPIB) Category C-1 or higher certified solar vendor.
System Capacity Guidelines for LESCO Prosumers
| System Size | Target Property Type | Required Sanctioned Load | Avg. Monthly Generation | Typical Monthly Bill Offset |
|---|---|---|---|---|
| 5 kW | Small Homes / 5 Marla | 5 kW – 7 kW | 600 – 650 Units | PKR 25,000 – 35,000 |
| 10 kW | Medium Homes / 10-20 Marla | 10 kW – 12 kW | 1,200 – 1,350 Units | PKR 55,000 – 75,000 |
| 15 kW | Large Residences / Small Offices | 15 kW – 18 kW | 1,800 – 2,000 Units | PKR 90,000 – 120,000 |
| 20 kW – 25 kW | Commercial Outlets / Small Factories | 20 kW – 25 kW | 2,500 – 3,300 Units | PKR 140,000 – 200,000 |
3. Step-wise LESCO Net Metering Approval Process
The application for the green meter is a systematic coordination between system owner, certified AEDB installer, LESCO sub-divisional offices and NEPRA. Standard 6-stage workflow is as follows:
Site Survey & Load Feasibility Assessment
Your solar engineer validates grid availability at the local distribution transformer (T/F). NEPRA regulations state that the total cumulative generation capacity on a transformer must not exceed 80% of its rated capacity. The installer checks your existing LESCO billing record, current load, phase wiring and earthing pit values.
Application Dossier Preparation & Filing
The installer compiles Schedule-I application forms along with technical datasheets, Single-Line Diagrams (SLD), equipment test reports and property documentation. This complete file is submitted to the office of the relevant LESCO Executive Engineer (XEN) / Superintending Engineer (SE) or processed via the LESCO Net Metering Portal.
LESCO Technical Inspection & NOC Verification
A LESCO inspection team (comprising SDO or Assistant Manager Tech) visits the installation site. They check the installed solar panels and grid tie or hybrid inverter are as per the given specifications, check the mandatory AC and DC surge protection devices (SPD), perform earthing test and anti-islanding tests. In case of project approval, LECSO will issue a No Objection Certificate (NOC) for Technical Feasibility.
Performance of Agreement and NEPRA Generation License
The prosumer and LESCO sign a formal Net Metering Agreement. LECSO sends the approved dossier to NEPRA office at Islamabad. NEPRA examines the dossier and enters the prosumer in the national registry for the issuance of Distributed Generation License.
Payment & Testing Green Meter Demand Notice
Demand Notice issued by LECSO for payment of bi-directional smart meter, initial testing costs and meter deposit. The applicant shall make the payments from any of the authorized bank branches. The bi-directional meter is dispatched to the LESCO Metering and Testing (M&T) laboratory for testing and calibration.
Net Metering Activation, Commissioning and Meter Replacement
The M&T team at LESCO is replacing the existing electricity meter with calibrated new Green Meter. System has been commissioned and LESCO billing profile has been changed to net metering tariff code.
4. List of Required Documents
Proper documentation should be provided for any delay or rejection of the screening process by LESCO.
Personal and Ownership Documents
- Copy of CNIC of the LESCO Account Holder
- Ownership of Property (Allotment letter/fard/registry)
- Last 3 months LESCO Electricity Bills
- NOC from Property Owner (if property is registered in the name of landlord)
Technical & Engineering Submissions
- Application for Standard Net Metering (Schedule-I)
- Single Line Diagram (SLD) approved from PEC licensed Engineer
- Inverter & PV Module Factory Test Certificates (IEC 62116 / UL 1741)
- AEDB Company Registration Certificate copy
5. Green Meter Specifications & Technical DB Protection
LESCO requires strict compliance with safety protocols to protect grid infrastructure and field technicians from hazardous back-feeding during line load shedding or outages.
Bi-Directional Green Meter Specifications
The installed smart meter must be an approved 3-phase, 4-wire bi-directional meter capable of recording active power (kWh), reactive power (kVARh), peak demand (kW) and bidirectional directional registers. Supported brands in LESCO territory typically include MicroTech, Hexing, Miramar, and Sanxing, fully integrated with GSM/GPRS SIM cards for Automated Meter Reading (AMR).
Mandatory Distribution Board (DB) & System Protections
LESCO M&T inspectors will reject connections that fail to implement full DC/AC protection chains:
| Protection Layer | Equipment Required | Technical Purpose |
|---|---|---|
| Anti-Islanding Protection | Internal Inverter Relay (UL 1741 / IEC 62116) | Automatically shuts off solar feed within milliseconds if LESCO grid power drops, preventing electrocution of utility workers. |
| AC Side Protection | 3-Phase AC Circuit Breaker (MCB/MCCB) + AC SPD Class II | Guards the inverter and internal home wiring against AC grid voltage spikes and high current short circuits. |
| DC Side Protection | 1000V DC Breaker + DC Fuses + DC Surge Protection Device (SPD) | Protects the inverter from atmospheric lightning strikes, high DC static and PV string short circuits. |
| Earthing / Grounding System | Dual Copper Earthing Pits (< 5 Ohms resistance) | Separate, dedicated grounding pathways for equipment chassis (AC/DC) and lightning surge arrestors. |
| Manual AC Breaker / Isolator | Lockable AC Disconnect Switch | External physical switch mounted near the meter box allowing LESCO personnel to manually isolate solar feed during line repairs. |
6. Net Metering Rate Design and Cost Evaluation
The cost analysis is important for the calculation of return on investment for the project. The total cost includes costs of hardware equipment, installation cost, vendor processing fees and LESCO demands.
Net Metering Processing and Hardware Cost Estimates (2026)
| Expense Category | Approximate Cost (PKR) | Notes / Details |
|---|---|---|
| LESCO Application & Processing Fee | PKR 1,000 – 3,000 | Paid via official bank voucher during initial filing. |
| 3-Phase Bi-Directional Smart Meter | PKR 25,000 – 45,000 | Includes testing, calibration, and smart SIM module installation. |
| Technical Protection DB Box & Wiring | PKR 18,000 – 35,000 | Covers AC/DC SPDs, breakers, copper earthing wire and lockable box. |
| Vendor Consultancy & Licensing Overhead | PKR 25,000 – 40,000 | Includes SLD engineering stamping, LESCO coordination, and NEPRA filing. |
| Total Net Metering Setup Overhead | PKR 70,000 – 120,000 | Excludes primary solar panel and inverter cost. |
Return on Investment for On-Grid Solar Systems (Turnkey) Calculation
| System Capacity | Turnkey Hardware + Net Metering Cost | Estimated Annual Energy Savings | Estimated Payback Period |
|---|---|---|---|
| 5 kW System | PKR 750,000 – 950,000 | PKR 220,000 – 280,000 | 3.0 – 4.0 Years |
| 10 kW System | PKR 1,400,000 – 1,750,000 | PKR 420,000 – 520,000 | 3.0 – 3.8 Years |
| 15 kW System | PKR 2,100,000 – 2,600,000 | PKR 600,000 – 750,000 | 3.2 – 4.0 Years |
| 20 kW System | PKR 2,800,000 – 3,400,000 | PKR 800,000 – 1,000,000 | 3.0 – 3.5 Years |
7. LESCO Solar Bills and Process for Off-Peak/Off-Peak Offsets
To read your LESCO net metering bill, you need to know unit offsets, peak hour definition and national policies on net metering.
1. Peak vs. Off-Peak Unit Adjustment Rules
LESCO residential bills break electricity consumption into Peak Hours (typically 4 hours during evening time with higher unit rates) and Off-Peak Hours (the remaining 20 hours of the day). Under standard NEPRA net metering rules:
- Solar exports occur during daylight hours, which fall under Off-Peak Hours.
- Off-Peak Exported units are offset 1:1 against Off-Peak Imported units on a kilowatt-hour basis.
- Off-Peak exports CANNOT directly reduce Peak Hour imports on a unit-for-unit basis. Instead, if you have net financial excess units at the end of the month, the financial credit value is subtracted from peak hour charges, applicable taxes and fixed charges.
2. Net Billing Framework Updates (2025–2026)
Important Regulatory Note: Under updated NEPRA Net Billing regulations, new prosumer agreements process surplus exported energy at a reference wholesale purchase rate (National Average Energy Purchase Price / NEPRA reference rate). Because imported grid electricity costs significantly more per unit due to fuel price adjustments (FPA) and taxes, the single most effective strategy to maximize return on investment in 2026 is maximizing daytime self-consumption (running heavy appliances like inverter ACs, water pumps and electric motors while solar generation is at its peak).
3. Financial Credit Rollover & Settlement
If your total monthly solar exports exceed your total monthly imports, your LESCO net bill shows a zero unit balance for Off-Peak consumption. Any surplus power generated and fed back into the system will be credited to your bill the following month, in monetary value. Balance amount will be adjusted as per NEPRA buy back policies on quarterly/ yearly basis.
8. Frequently Asked Questions (FAQs)
FINAL SUMMARY JUDGMENT
In spite of regulatory updates and tariff revisions, solar net metering in LESCO territory is still one of the most effective investments for residential and commercial consumers in Pakistan. With average payback periods of 3 to 4 years, and solar panel lifetimes of over 25 years, switching to a Green Meter guaranties long term energy independence and a drastic reduction in monthly utility bills.
