⚡ Kerala Domestic LT-1A · 2025-26 Tariff

KSEB Bill Calculator

Calculate your Kerala electricity bill instantly — correct telescopic and non-telescopic slab logic, all charges included.

250 UnitsTelescopic limit
₹3.25 – ₹9.20Per unit rate range
10%Electricity duty
Bi-MonthlyKSEB billing cycle
Connection Type
150 units
0100250500700+
✅ Telescopic Zone — lower slab rates apply
Total Payable Amount
₹0
for 0 units · bi-monthly
✅ Telescopic Billing
Energy Charges
₹0
Fixed Charge
₹80
Fuel Surcharge (10p/unit)
₹0
Electricity Duty (10%)
₹0
Meter Rent + Cess
₹14
Slab-wise Energy Charge Breakdown
Slab (Units)Rate / UnitUnits ChargedSlab Amount

KSEB 2025-26 Tariff Reference (LT-1A Domestic)

SlabUnitsRate / UnitBilling Mode
Slab 10 – 50₹3.25Telescopic (≤250 units)
Slab 251 – 100₹4.05Telescopic (≤250 units)
Slab 3101 – 150₹5.10Telescopic (≤250 units)
Slab 4151 – 200₹6.95Telescopic (≤250 units)
Slab 5201 – 250₹8.20Telescopic (≤250 units)
NT-3000 – 300₹6.75 (all units)Non-Telescopic (>250)
NT-3500 – 350₹7.60 (all units)Non-Telescopic (>250)
NT-4000 – 400₹7.95 (all units)Non-Telescopic (>250)
NT-5000 – 500₹8.25 (all units)Non-Telescopic (>250)
NT-500+Above 500₹9.20 (all units)Non-Telescopic (>250)

Fixed: ₹80 single / ₹220 three phase per bi-monthly cycle. Fuel surcharge: ₹0.10/unit. Electricity duty: 10% on energy charges only. Meter rent + cess: ₹14/cycle.

KSEB Bill Calculator: Understand Your Kerala Electricity Bill Before It Arrives

Getting your KSEB electricity bill and finding an amount much higher than expected is one of the most common frustrations for households in Kerala. The billing structure is not complicated once you understand it, but the telescopic and non-telescopic split catches many people off guard. This calculator is built to change that.

KSEB, the Kerala State Electricity Board, follows a tiered tariff system for domestic consumers under the LT-1A category. The rates depend on how many units you consume in a two-month billing cycle, not a single month. Understanding this bi-monthly structure is the first step to making sense of your bill.

How KSEB Billing Works: The Bi-Monthly Cycle

KSEB reads domestic meters once every two months, so each bill covers 60 days of consumption. When you see a bill for 180 units, that reflects usage over two months, not one. All the slab thresholds in the tariff are also defined for this 60-day period.

If you divide your bill units by two to estimate monthly usage, the slab rates do not scale the same way. Paying for 90 units twice is not the same as paying for 180 units in one cycle. The full bi-monthly figure determines which slab rules apply.

Telescopic vs Non-Telescopic Billing: The Most Important Thing to Know

This is the single biggest factor in how your KSEB bill is calculated. If your total bi-monthly consumption is 250 units or less, the telescopic system applies. Each slab of units is charged at its own rate — the first 50 units at ₹3.25 each, the next 50 at ₹4.05, and so on up to the 201–250 band at ₹8.20 per unit.

The moment your consumption crosses 251 units, the entire calculation changes. The telescopic benefit disappears and every unit from 1 to your total is now charged at a flat non-telescopic rate determined by which band your total falls into.

The 250-unit trap: At 249 units, telescopic billing gives an energy charge of approximately ₹1,299. At 251 units, the non-telescopic rate of ₹6.75 applies to all 251 units — giving approximately ₹1,694. That is a jump of nearly ₹400 for just 2 extra units. Staying under 250 units bi-monthly is the most impactful thing you can do to control your KSEB bill.

What Goes Into Your KSEB Bill Besides the Energy Charge

Fixed Charge

KSEB levies a fixed charge every billing cycle regardless of usage. Single-phase connections pay ₹80 per cycle (₹40/month). Three-phase connections pay ₹220 per cycle (₹110/month). This covers the cost of maintaining your connection and distribution infrastructure.

Fuel Surcharge

A provisional fuel surcharge of 10 paise per unit is applied to recover higher power purchase costs. It applies to every unit consumed — the more you use, the higher this amount.

Electricity Duty

The Kerala government levies a 10 percent electricity duty calculated only on the energy charges. Fixed charges and fuel surcharge are excluded. If your energy charge is ₹800, the duty adds ₹80 to your bill.

Meter Rent and Cess

A small charge of approximately ₹14 per billing cycle covers meter rent and cess for most domestic consumers.

KSEB 2025-26 Tariff Quick Reference

Consumption (Bi-Monthly)Rate Per UnitBilling Mode
0 – 50 units₹3.25Telescopic
51 – 100 units₹4.05Telescopic
101 – 150 units₹5.10Telescopic
151 – 200 units₹6.95Telescopic
201 – 250 units₹8.20Telescopic
Up to 300 units₹6.75 (all units)Non-Telescopic
Up to 500 units₹8.25 (all units)Non-Telescopic
Above 500 units₹9.20 (all units)Non-Telescopic

Practical Tips to Reduce Your KSEB Bill

The 250-unit threshold is the most important number to watch. If you typically consume 230 to 260 units bi-monthly, you are right in the danger zone. Check your meter reading halfway through the cycle — around day 30. If you are already at 130 units by that point, reduce usage carefully for the remaining 30 days.

Old ceiling fans with induction motors draw 70 to 80 watts. Modern BLDC fans draw just 28 to 35 watts for the same airflow. Replacing three fans with BLDC models can save 15 to 20 units per month per fan, often keeping you in the telescopic zone year-round.

For air conditioning, each degree you raise the thermostat from 18 to 24 degrees reduces consumption by roughly 6 percent per degree. Running an AC at 24 degrees instead of 18 degrees is nearly 36 percent more efficient — saving 30 to 40 units per billing cycle for a 1.5-ton unit running 6 hours nightly.

Smart meter tip: KSEB is rolling out smart meters across Kerala. With a smart meter and the KSEB Official app, you can check real-time consumption instead of waiting for the meter reader — making it much easier to track your position relative to the 250-unit threshold before the bill is generated.

Frequently Asked Questions

Why did my KSEB bill suddenly jump even though I used just a few extra units?
You almost certainly crossed the 250-unit telescopic limit. When bi-monthly consumption moves from 249 to 252 units, the entire calculation switches from telescopic to non-telescopic mode. All 252 units are then charged at a flat higher rate instead of the lower slab-wise rates. This can add ₹300 to ₹600 to your bill for just a handful of extra units. Monitor your consumption around the 220 to 240 unit mark and reduce usage toward the end of the cycle if you are close to the threshold.
Is three-phase connection charged at higher per-unit rates than single-phase?
No. The energy charge per unit is identical for both single-phase and three-phase domestic connections under LT-1A. The only difference is the fixed charge — ₹80 per cycle for single phase versus ₹220 per cycle for three phase. The higher fixed charge reflects the greater infrastructure capacity required for three-phase connections.
How is electricity duty calculated on a KSEB bill?
Electricity duty is a state government levy at 10 percent of your energy charges only. Fixed charges, fuel surcharge, and meter rent are excluded from this calculation. So if your energy charge is ₹1,200, the electricity duty adds ₹120 — not 10 percent of your total bill amount.
What is the fuel surcharge and can it change?
The fuel surcharge is a provisional levy to recover additional costs when actual power purchase expenses exceed the amounts built into the approved tariff. The current rate is 10 paise per unit, applied uniformly to every unit consumed. The Kerala State Electricity Regulatory Commission can revise this based on KSEB's periodic cost recovery petitions.
Does solar net metering eliminate all KSEB charges?
Solar net metering reduces energy charges significantly by offsetting imported units against exported units. However, fixed charges are levied in full regardless of how much solar you generate. Even a net-zero consumer pays the full fixed charge every billing cycle. Surplus exported units are banked for future offset under the net metering framework.

Disclaimer: This calculator is for estimation and educational purposes only, based on the KSEB LT-1A domestic tariff for 2025-26. Tariff rates, surcharges, and duties are subject to revision by KSERC. Always refer to your official KSEB bill for the exact payable amount. This tool is not affiliated with or endorsed by KSEB or the Government of Kerala.