Net Metering in Kerala: How KSEB Banks, Settles, and Pays for Your Solar Surplus (2026 Guide)
If you’ve installed or are planning to install a rooftop solar system in Kerala, there’s one question that trips up almost every homeowner and business owner alike: what actually happens to the extra solar power you don’t use?
The short answer: it doesn’t vanish, and it doesn’t roll over forever either. Under KSEB’s net metering framework, surplus solar energy is banked as a credit, adjusted against your future consumption, and if anything is left over at the end of the financial year paid out in cash at a regulated rate that is much lower than your retail tariff.
That last part catches a lot of solar owners off guard, and it has a direct impact on how big a solar plant you should actually install. This guide breaks down exactly how KSEB and KSERC (Kerala State Electricity Regulatory Commission) handle net metering in 2026, so you can size your system correctly and avoid leaving money on the table.
What Is Net Metering in Kerala?
Net metering is the billing arrangement KSEB uses for rooftop solar owners (called prosumers) who are connected to the grid. Instead of paying for gross electricity consumption, your bidirectional meter tracks the net difference between what you draw from the grid and what you export to it.
- Solar power you use the moment it’s generated offsets your consumption directly.
- Solar power you export but don’t immediately use is banked as a credit and adjusted against future bills.
- Any credit left unused at the end of the settlement period is paid out in cash not carried forward indefinitely.
This system applies differently depending on your connected load, so the rules aren’t identical for every consumer.
How Banking Works for Systems Up to 20 kW
For most residential and small commercial consumers with a connected load of 20 kW or below, KSEB uses a straightforward energy-banking model one unit exported effectively offsets one unit imported.
Here’s a simple illustration:
Month | Solar Generated | Self-Consumed | Exported to Grid | Imported from Grid |
April | 1,000 units | 400 units | 600 units | 300 units |
In this example, 600 exported units minus 300 imported units leaves a surplus of 300 banked units. If the following month you draw 500 units from KSEB but only export 200, the 300 banked units from April are used to offset the shortfall.
The key takeaway: you don’t lose your surplus every billing cycle. It accumulates and continues to offset consumption through the rest of the settlement period which brings us to the part most people get wrong.
The Settlement Period: 1 April to 31 March
Under the KSERC (Renewable Energy and Net Metering) First Amendment Regulations, 2022, the settlement period for prosumers runs on the financial year 1 April of one year through 31 March of the next. For example, the 2026-27 settlement year runs from 1 April 2026 to 31 March 2027.
Any banked surplus can be used to offset consumption anywhere within that window but it cannot be carried forward past 31 March into the next settlement year under the standard mechanism
What Happens to Unused Units on 31 March?
This is the single most misunderstood part of Kerala’s net metering system.
If you still have banked units left over when the settlement period closes on 31 March, KSEB doesn’t simply reset the counter nor does it let you keep drawing on that credit into April. Instead, KSEB is required to financially settle the remaining banked energy at the Average Pooled Purchase Cost (APPC) approved by KSERC for that year.
In plain terms:
Unused units on 31 March × applicable APPC rate = your settlement payout
Why the APPC Rate Matters So Much
Here’s the catch that changes the entire economics of solar sizing: the APPC settlement rate is nowhere close to your retail electricity tariff.
KSERC has repeatedly confirmed and upheld an APPC of ₹3.26 per unit for settling banked rooftop solar energy a rate that was reaffirmed in mid-2026 after prosumers petitioned for a higher payout (they had argued for ₹4.34/unit, but the Commission rejected the appeal, noting that daytime solar exports carry a lower opportunity cost than KSEB’s evening peak-hour purchases). Rates are reviewed and can change from year to year, so always check the applicable KSERC order for the current settlement year rather than assuming a fixed figure.
Compare that ₹3.26/unit settlement rate against a typical domestic retail tariff of ₹7 – 8+ per unit, and the gap becomes obvious:
- 1,000 unused units settled at APPC (₹3.26): roughly ₹3,260
- The same 1,000 units, self-consumed instead: could have avoided ₹7,000–8,000+ in retail electricity charges
That’s a difference of more than double, sometimes triple depending on your tariff category. This single fact should shape how you size your solar plant.
The Golden Rule: Don’t Oversize Your Solar Plant
Because unused surplus is settled at a fraction of retail value, deliberately building a plant that produces far more than you consume annually is usually a poor economic decision.
Compare two scenarios:
Plant A – Right-sized Annual consumption: 12,000 units | Solar production: 12,000 units → Nearly all generation is either self-consumed or absorbed through net-metering adjustment. Minimal loss to APPC settlement.
Plant B – Oversized Annual consumption: 12,000 units | Solar production: 18,000 units → A 6,000-unit surplus that likely can’t be fully absorbed within the settlement year, with the residual settled at the much lower APPC rate.
Systems Above 20 kW: Time-of-Day (ToD) Accounting
For consumers with a connected load above 20 kW, KSEB doesn’t apply a simple one-for-one banking rule. Instead, exported energy is adjusted using time-of-day factors with different multipliers applied for normal, peak, and off-peak hours (commonly cited adjustment factors are in the region of 80%/100%/120% depending on the time band).
If you’re evaluating a 50 kW, 100 kW, or larger commercial or industrial rooftop system, this ToD mechanism materially changes the value of each exported unit so don’t apply the simple >20 kW household logic to a larger installation without checking the applicable ToD arrangement.
Important distinction: the >20 kW threshold applies to your connected load / contract demand and regulatory category, not simply your solar plant’s rated capacity. A 30 kW solar plant paired with a smaller sanctioned load needs to be assessed against the connected-load rules, not the panel capacity alone.
Wheeling Surplus Energy to Other Premises
KSEB’s net metering agreement also allows for wheeling excess electricity to other premises owned by the same consumer, subject to KSERC regulations and specified priority conditions. For businesses operating across multiple properties, this can be a far more valuable route than letting surplus accumulate toward an eventual APPC settlement.
Note that wheeling is not the same as virtual net metering, and applicable charges or transmission losses may apply depending on the arrangement so this needs to be evaluated case by case.
Turning Low-Value Export Into High-Value Self-Consumption
Rather than letting daytime surplus pile up toward a low-value APPC settlement, the smarter strategy is to shift more of your own consumption into daylight hours. Practical ways to do this include:
- EV charging during the day
- Water pumping and irrigation scheduling
- HVAC pre-cooling before peak evening loads
- Battery storage charging
- Water heating
- Refrigeration cycling
- Scheduled industrial or machinery loads
- Solar-powered auxiliary equipment
Every unit you shift from “exported and eventually settled at APPC” to “self-consumed” is effectively worth 2–3x more.
A Worked Example: 10 kW Residential System
- Annual KSEB consumption: 12,000 units
- Annual solar generation: 13,500 units
- Potential surplus: 1,500 units
After monthly banking and adjustment, suppose 1,000 units remain unused on 31 March. At an illustrative APPC of ₹3.25/unit, that’s a payout of roughly ₹3,250 versus the ₹6,000–8,000+ you’d have saved by consuming those units directly. The lesson holds at any scale: self-consumption value is almost always greater than annual settlement value.
Cash Flow: When Does the APPC Payment Actually Arrive?
Don’t model your APPC settlement as an instant credit on 1 April. In practice, settlement is processed through KSEB’s billing and credit mechanism, and there have been documented cases before the Consumer Grievance Redressal Forum (CGRF) involving delayed settlement payments. For financial planning, treat the annual APPC payout as a year-end receivable, not a guaranteed same-day transaction.
Key Takeaways
- Surplus solar in Kerala is banked, not lost but only within the current settlement period (1 April–31 March).
- Anything unused at year-end is paid out at APPC, a rate substantially below retail tariffs.
- Right-sizing your solar plant to match consumption not maximising panel capacity is the single biggest driver of solar ROI under Kerala’s net metering rules.
- Systems above 20 kW connected load face time-of-day accounting, not simple one-for-one banking.
- Shifting consumption into daylight hours (EV charging, pumping, HVAC, etc.) converts low-value exports into high-value self-consumption.
- Multi-premises businesses should evaluate wheeling as an alternative to letting surplus accumulate.
Frequently Asked Questions
What is the current settlement period for net metering in Kerala?
The settlement year runs from 1 April to 31 March, per the KSERC First Amendment Regulations, 2022.
What happens to unused banked solar units at the end of the year?
KSEB settles them financially at the KSERC-approved Average Pooled Purchase Cost (APPC), which is typically far lower than retail electricity tariffs.
What is the current APPC rate in Kerala?
KSERC has upheld ₹3.26 per unit for banked rooftop solar settlement in recent orders, though this rate is reviewed periodically always confirm the applicable order for the current settlement year before modelling returns.
Should I install a bigger solar system than I need?
Generally, no. Because leftover surplus is settled at APPC rather than retail value, sizing your system close to your actual annual consumption typically delivers better returns than deliberately oversizing.
Do the net metering rules differ for larger commercial systems?
Yes. Consumers with a connected load above 20 kW are subject to time-of-day (ToD) accounting with different adjustment factors for peak, off-peak, and normal hours, rather than simple one-for-one banking.
This article is for general informational purposes based on publicly available KSEB and KSERC materials and does not constitute financial or regulatory advice. APPC rates and net metering regulations are subject to periodic revision to verify current figures against the latest KSERC order before making investment decisions.
