Electricity tariffs in Kerala have increased by over 30% in recent years, while most rooftops still remain underutilized. This creates a clear opportunity to turn unused space into a reliable source of energy savings. With 4.5 to 5.5 peak sun hours available daily, Net Metering in Kerala enables homeowners and businesses to generate their own power, offset electricity bills, and earn credits for surplus energy exported to the grid. This blog provides a structured breakdown of how the KSEB net metering process works, who is eligible, the complete registration process, key rules under KSERC 2020, and how to calculate real savings. Rumion Power India, a KSEB and MNRE approved solar vendor, helps streamline this entire process, ensuring efficient installation, compliance, and maximum return on investment.
What is Net Metering?
Net metering in Kerala is a billing mechanism where a solar system owner, called a “prosumer”, can export surplus electricity to the grid and receive credits against future consumption. A prosumer is simply a consumer who also produces electricity. Think of your electricity meter like a financial account. During the day, your solar panels deposit excess units into the KSEB grid. At night, you withdraw energy. At the end of the billing period, you pay only for the net electricity used after exports are considered. This is very different from gross metering, where all solar energy is exported, and you still pay full price for your consumption. Net metering is far more beneficial for most users in Kerala. Net metering in Kerala is governed by the KSERC Renewable Energy and Net Metering Regulations, 2020. Both residential and commercial users up to 1000 kW can benefit.
How Does Net Metering Work in Kerala?
During Daylight Hours
Solar panels installed on your rooftop capture sunlight and convert it into direct current (DC) electricity. A grid-tied inverter converts this into AC power. Your home consumes this solar energy first.
If there is surplus, it flows automatically into the KSEB grid.
The Bi-directional Meter
KSEB installs a two-way meter that tracks:
● Units imported from the grid
● Units exported to the grid
A separate solar meter records total generation. Together, these provide complete visibility.
How Your Bill is Calculated
At the end of the billing cycle:
Net Units = Imported Units − Exported Units
You pay only for the net consumption. If exports exceed imports, the surplus is carried forward.
Time-of-Day Rules (Above 20 kW)
For larger systems:
● Normal: 6 AM to 6 PM
● Peak: 6 PM to 10 PM
● Off-peak: 10 PM to 6 AM
Energy adjustments include incentives such as 120% adjustment benefits in certain cases, making KSEB net metering even more attractive for commercial users.
Who is Eligible for Net Metering in Kerala?
Eligible Categories
● Residential users
● Commercial establishments
● Industrial units
● Agricultural consumers
● Apartment associations
Capacity Rules
● Minimum: 1 kW
● Maximum: 1000 kW
● Single-phase: up to 5 kW
● Domestic users up to 20 kW can install equivalent solar capacity
Technical Requirements
● Grid-connected system
● Anti-islanding inverter
● Installed by a licensed contractor or approved vendor
Property Rules
The system must be installed on your premises. Multiple properties can have independent systems.
KSERC Net Metering Regulations 2020 – Key Policy Rules Explained
Connectivity
KSEB must provide net metering on a first-come basis. Meter installation must happen within 10 days after approval. Transformer capacity is capped at 75% for solar connections, which can impact approval timelines in high-demand areas.
Agreement
Before system activation, a formal Connection Agreement must be executed between the prosumer and KSEB. This agreement defines operational terms, safety compliance and billing structure. Once the agreement is signed, KSEB is obligated to synchronize the system with the grid within 7 days, ensuring minimal delay between installation and energy generation benefits.
Settlement Period
The settlement cycle runs from October 1 to September 30 of each year. Unused units at year-end are compensated at APPC rates, typically ₹3.5 to ₹4.5 per unit.
Consumer Benefits
● No transmission or wheeling charges
● Transparent capacity disclosures
● Registration validity of 1 year
Net Metering Policy Updates in Kerala (2024–2025)
Recent developments have strengthened the case for solar:
● KSEB Soura scheme supports residential adoption
● APPC rates updated annually
● Increased focus on rooftop solar targets under the national mission
In cities like Kochi and Thiruvananthapuram, transformer capacity constraints are becoming a key consideration, making early application critical.
Complete Step-by-Step Net Metering Registration Process in Kerala
Step 1 – Feasibility Check
Start by evaluating your monthly electricity consumption, rooftop area, and connection type (single-phase or three-phase). As a rule of thumb, you need around 60–80 sq. ft. per kW of solar capacity. This step ensures your system is correctly sized for maximum solar net metering savings. This step has two phases.
1. DTR ( Distribution Transformer ) Feasibility – at Rumion Power India, we conduct a DTR feasibility check, before starting the procedure.
2. Site Feasibility – once the DTR feasibility is confirmed, then the Site Feasibility inspection will be carried out.
Step 2 – Annexure-A Submission
Submit the feasibility application (Annexure-A) to your local KSEB office along with basic details and application fees. KSEB typically completes the technical feasibility check within 15 days and confirms the permissible system capacity and technical requirements.
Step 3 – PMSG Registration and Subsidy approvals for subsidy projects
Once feasibility is approved, you must submit the detailed registration application (Annexure-B) within 30 days. This includes technical documents, system specifications and layout diagrams. After verification and fee payment, KSEB issues a registration number.
Step 4 – Annexure-B Registration
Once feasibility is approved, you must submit the detailed registration application (Annexure-B) within 30 days. This includes technical documents, BIS certificates of the Solar Panels & Solar Inverter , Other Electrical system specifications, and layout diagrams. After verification and fee payment, KSEB issues a registration number.
Step 5 – Solar Installation
Proceed with installation using MNRE-compliant components and a licensed contractor. This includes solar panels, a grid-tied inverter, isolating switches, and safety systems. Choosing a KSEB-approved vendor ensures compliance and avoids rework.
Step 5 – Electrical Inspection
After installation, apply for inspection by the Electrical Inspector. The system undergoes safety and technical checks, and upon approval, a commissioning certificate is issued.
Step 6 – KSEB Testing and Agreement
Submit the Electrical Inspector’s approval to KSEB. The utility conducts its own verification and signs a Connection Agreement with the prosumer, defining operational and billing terms.
Step 7 – Meter Installation
KSEB installs the bi-directional net meter and renewable energy meter within 10 days. Both are tested, sealed, and synchronized with the grid.
Step 8 – Billing Activation
Once commissioning is complete, your system goes live. Your next electricity bill will reflect solar generation, export, import, and net consumption. This is where Net Metering in Kerala starts delivering measurable savings.
Documents Required for Net Metering Application in Kerala
Getting your documents right is one of the most important parts of the KSEB net metering registration process. A small mistake or missing file can delay approvals. Here is a simple and easy-to-follow checklist.
Annexure-A (Feasibility Application)
You need basic details to check if your location is suitable for solar:
● Latest KSEB electricity bill (with consumer and meter number)
● Proof of ownership or occupancy
(sale deed, rental agreement, or property tax receipt)
● Simple sketch of your rooftop or premises showing where panels will be installed
● Proposed solar system size and type (on-grid or hybrid)
Annexure-B (Registration Application)
This is the detailed application after feasibility approval:
● All documents submitted in Annexure-A
● Technical specifications of solar panels, inverter, and isolating switch
● Detailed layout of the solar system
● Single-line diagram (SLD) of the electrical setup
● Installer certificate confirming compliance with KSEB and CEA standards
● Proof of registration fee payment
Electrical Inspector Inspection
After installation, your system must be inspected for safety:
● Work completion report from the licensed contractor
● Test certificates for solar panels and inverter
● Final installation diagram
Grid Connection and Commissioning
Final step before your system goes live:
● Electrical Inspector’s Safety Certificate
● Net meter details (if you purchased it yourself, it must meet KSEB standards)
● Connection agreement provided by KSEB
Types of Meters Used in Net Metering (Kerala)
In a net metering Kerala setup, meters play a critical role in tracking how much electricity you consume, generate, and export. KSEB uses a combination of meters to ensure accurate billing and performance monitoring.
1. Bi-directional Net Meter
This is the most important meter in the system.
● Measures electricity imported from the KSEB grid and exported back to the grid
● Records both values separately in kWh
● Forms the basis for your net metering bill calculation
● Installed at the interconnection point by KSEB
● KSEB may charge a rental fee or you can choose to purchase a compliant meter to avoid recurring costs
In simple terms, this meter tracks your “give and take” with the grid.
2. Renewable Energy Meter (Solar Meter)
This meter focuses only on your solar generation.
● Records total electricity generated by your solar system
● Installed separately from the net meter
● Works in one direction (generation only)
● Useful for tracking system performance and for subsidy verification
While it does not impact billing directly, it helps ensure your system is producing as expected.
3. ABT (Availability-Based Tariff) Compliant Meters
These are typically used in larger setups.
● Suitable for commercial and industrial consumers
● Already capable of handling net metering functions
● No need for an additional net meter if compatible
This reduces infrastructure requirements for high-capacity users.
Meter Standards
All meters used in KSEB net metering must:
● Comply with Central Electricity Authority (CEA) regulations
● Meet KSEB technical specifications
● Be tested, verified, and sealed before commissioning
● Be installed or approved by KSEB
Net Metering Savings Calculation – Real Numbers for Kerala Consumers
Understanding the Calculation Framework
Your solar energy bill savings in Kerala depend on five key factors:
- System size (kW)
- Average daily solar generation (kWh)
- KSEB electricity tariff (per unit rate)
- Consumption pattern (how much you use vs export)
- Banking of excess units
The goal is simple: maximize self-consumption and minimize excess export.
Residential Example (3 kW)
● Monthly generation: 360 to 450 units
● Consumption: 300 units
● Net bill: nearly zero
● Annual savings: ₹24,000 to ₹36,000
Commercial Example (10 kW)
For small businesses:
● System size: 10 kW
● Monthly generation: 1,200–1,500 units
● Monthly consumption: 1,500 units
Energy flow:
● Export: 400–600 units
● Import: 300–500 units
Billing outcome:
● Net savings: 800–1,000 units per month
Financial impact:
● Annual savings: ₹80,000 to ₹1,20,000
● Payback period: 4 to 5 years
Industrial Example (50 kW)
For higher consumption facilities:
● System size: 50 kW
● Monthly generation: 6,000–7,500 units
● Monthly consumption: 10,000 units
Billing outcome:
● Net savings: 5,500–6,500 units per month
Financial impact:
● Annual savings: ₹6.5 lakh to ₹9 lakh
● Payback period: 2.5 to 4 years
Understanding the Year-End Settlement
Net metering in Kerala follows an annual settlement cycle ending on September 30.
● Any unused banked units are paid at APPC rates
● APPC in Kerala: ₹3.5 to ₹4.5 per unit
This is lower than retail tariffs, which means:
● Over-sizing your system reduces ROI
● Optimal sizing ensures higher savings
ROI and Payback Summary Table
| System Size | Monthly Savings (Approx.) | Annual Savings | Payback (Post Subsidy) |
| 1 kW | ₹500–₹800 | ₹6,000–₹9,600 | 5–7 years |
| 3 kW | ₹1,500–₹2,500 | ₹24,000–₹36,000 | 4–6 years |
| 5 kW | ₹2,500–₹4,000 | ₹30,000–₹52,000 | 4–5 years |
| 10 kW | ₹6,000–₹10,000 | ₹72,000–₹1,20,0 00 | 4–5 years |
| 50 kW | ₹40,000–₹60,000 | ₹5.5L–₹7.2L | 3–4 years |
The key to maximizing solar net metering savings is sizing your system correctly. Oversizing reduces returns due to lower APPC rates.
On Grid vs Off Grid Solar – Which One Qualifies for Net Metering?
Choosing the right solar system is a strategic decision that directly impacts your savings, reliability, and eligibility for Net Metering in Kerala. Here’s a simple overview of each option.
On-Grid (Grid-Tied) Solar System
This is the most widely used and recommended system in Kerala.
● Directly connected to the KSEB grid
● Does not require battery storage
● Excess electricity is automatically exported to the grid
● Fully eligible for net metering
● Lower upfront cost due to the absence of batteries
● Ideal for areas with a stable power supply
For most homeowners and businesses, an on grid solar system Kerala setup delivers the highest return on investment with minimal complexity.
Off-Grid Solar System
Designed for independence from the grid.
● Not connected to KSEB
● Uses batteries to store excess energy
● Not eligible for net metering
● Higher upfront cost due to battery systems
● Suitable for remote areas or locations with unreliable electricity
An off grid solar system in Kerala is best suited for farms, rural properties, or areas with frequent long-duration outages.
Hybrid Solar System
A combination of grid connectivity and battery backup.
● Connected to KSEB and includes battery storage
● Eligible for net metering under KSERC 2020 regulations
● Provides backup power during outages
● Higher cost, but offers flexibility and reliability
This is ideal for users who want both savings and uninterrupted power.
Which System is Right for You?
A simple way to decide:
● Stable grid + focus on reducing electricity bills → On Grid Solar
● Unstable grid or remote location → Off-grid Solar
● Need savings along with backup power → Hybrid Solar
Common Mistakes to Avoid
One of the biggest challenges in net metering in Kerala is not the process itself, but avoidable mistakes that slow everything down. Choosing a non-approved vendor can lead to rejection, while oversizing your system without checking transformer capacity may put your application on hold. Missing deadlines, especially for Annexure submissions, often forces you to restart the process. Skipping mandatory inspections or using non-compliant meters can delay commissioning, and ignoring subsidy registration means losing financial benefits. These gaps directly impact approval timelines and overall savings, making proper planning and execution critical.
Why Rumion Power India Is the Right Choice
Rumion Power India is a trusted name in solar installation services in Kerala, delivering end-to-end solutions.
Rumion Solar manages:
● Site assessment
● System design
● KSEB approvals
● Loans and Financial Arrangements
● Installation
● Subsidy support
● Service and Warranty Supports
The team works strictly within KSERC regulations and ensures faster approvals with zero documentation errors. With installations across Kerala, Rumion Power India focuses on performance, compliance, and long-term savings.
Frequently Asked Questions
1. What happens during a power cut?
On-grid systems automatically shut down during a KSEB outage due to safety mechanisms (anti-islanding). Only hybrid systems with battery backup will continue to supply power.
2. Is net metering available for commercial or industrial buildings?
Yes, KSEB net metering is available for commercial and industrial consumers up to 1000 kW capacity, subject to connected load and KSERC regulations.
3. Is there a cost for the net meter?
KSEB may charge a security deposit and a rental fee for the bi-directional meter. Alternatively, you can purchase a KSEB-approved meter to avoid recurring charges.
4. Does net metering work with a three-phase connection?
Yes, both single-phase and three-phase connections are eligible. However, single-phase systems are limited to 5 kW capacity.
5. Can solar be installed on a rented rooftop or commercial space?
Yes, as long as you have a valid electricity connection at that location and permission from the property owner.
6. Which is the best solar company in Kerala for net metering?
Rumion Power India are KSEB-approved vendor with comprehensive expertise, handling everything from application and approvals to installation and subsidy support, ensuring a smooth and compliant transition to solar.
Conclusion
Net metering in Kerala transforms your rooftop into a revenue-generating asset. With rising tariffs, strong sunlight availability, and government incentives, solar adoption is no longer optional; it is strategic. A typical system takes 60 to 90 days to install, delivers payback within 4 to 6 years, and operates efficiently for over 25 years. With subsidies of up to ₹78,000 available, the financial case is clear.
Execution, however, is where most projects succeed or fail. Choosing an experienced partner like Rumion Power India, recognized among the best solar company in Kerala, ensures compliance, faster approvals, and maximum returns on your solar investment.
