How is a KSEB domestic electricity bill calculated?

KSEB domestic bills (LT-1A category) consist of energy charges calculated block-by-block across tariff slabs, fixed charges based on single or three-phase connection, 10% statutory Kerala electricity duty on energy charges, meter rent, and periodic fuel adjustment charges (FAC).

What happens if my consumption crosses 250 units in a month?

When consumption exceeds 250 units in a month (or 500 units bi-monthly), billing shifts from telescopic (tiered slabs) to non-telescopic. A single higher flat rate applies to your entire consumption, causing a sharp bill jump.

What is the electricity duty in Kerala?

Under Section 3 of the Kerala Electricity Duty Act, 1963, a statutory duty of 10% is levied on the total energy charges.

Deterministic Utility

KSEB Domestic Bill Calculator

See exactly how every rupee in your electricity bill is calculated under the latest KSERC LT-1A tariff order. Adjust units and billing cycles below to test consumption scenarios.

Interactive Utility

Quick Bill Calculator

Calculate estimated domestic (LT-1A) charges in Kerala instantly.

Billing Cycle

Connection Phase

Units Consumed (2 Months Total)Cliff: 500 units

units

Presets:

Estimated Total Bill (LT-1A)Telescopic Slabs

₹1,247.25

✓Your consumption is within the subsidized telescopic slab tier.

500 vs 501 Units Comparison+₹516.75 Jump

Energy Charges Only (Excludes Fixed Charges & Duty)

500 units (Telescopic)~₹2865.00

501 units (Flat Rate)~₹3381.75

Read full mathematical cliff analysis →

Informational estimate based on KSERC LT-1A domestic schedule. Includes baseline assumptions (standard utility static meter rent and illustrative ₹0.10/unit fuel surcharge). Actual bills vary with exact reading cycles and periodic regulatory adjustments.

Understanding the 250-Unit Cliff

Why crossing the threshold by even 1 single unit triggers an abrupt price surge.

Mathematical Cliff Analysis

The 250 vs. 251 Unit Comparison (Monthly Equivalent)

Under KSERC LT-1A regulations, the first 250 units benefit from telescopic block subsidies. At 251 units, the entire bill flips to non-telescopic flat pricing.

250 Units Consumed Telescopic

0 – 50 units (50 @ ₹3.35) ₹167.50

51 – 100 units (50 @ ₹4.25) ₹212.50

101 – 150 units (50 @ ₹5.35) ₹267.50

151 – 200 units (50 @ ₹7.20) ₹360.00

201 – 250 units (50 @ ₹8.50) ₹425.00

Total Energy Charges ₹1,432.50

+ Fixed Charge, Duty, Meter & Surcharge ~₹214.25

Total Estimated Bill: ₹1,646.75

251 Units Consumed Non-Telescopic

Subsidies Revoked: Slabs 0–50, 51–100, etc., are no longer applied. All 251 units are flat-charged at the higher tier rate.

All 251 units (251 @ ₹6.75 flat) ₹1,694.25

+ Fixed Charge, Duty, Meter & Surcharge ~₹240.53

Single-unit penalty jump +₹288.03

Total Estimated Bill: ₹1,934.78

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Monthly Takeaway (250 vs 251 units): Consuming just 1 single extra unit beyond 250 units adds ₹288.03 in total bill increase (+₹261.75 in energy charges alone: ₹1,646.75 to ₹1,934.78) because you forfeit lower slab subsidies on all preceding 250 units.

Bi-Monthly Takeaway (Standard 60-Day Kerala Billing — 500 vs 501 units): The same rule scales to 500 units bi-monthly. Crossing from 500 to 501 units jumps your bill from ₹3,293.50 to ₹3,862.03 — an instant penalty surge of +₹568.53 (+₹516.75 in energy charges alone).

1. Fixed Charges

Standard single-phase connections pay ₹80 bi-monthly (₹40/month). Three-phase connections are charged ₹110 per kW of sanctioned connected load per month.

2. 10% Government Duty

Statutory levy mandated by the Kerala Electricity Duty Act, 1963. Calculated as exactly 10% of the gross energy charge.

3. Fuel Surcharge (FAC)

Fuel Adjustment Charges periodically notified by KSEBL to recover thermal fuel generation and power exchange purchase costs.

Did this calculator help you understand your KSEB bill math?