KSEB Tariff Slabs 2026: Current Domestic Rates, Fixed Charges & Bill Calculation

Your KSEB bill can rise much faster than your electricity use. The reason is not simply a higher “per-unit price”: Kerala domestic accounts move through telescopic slabs up to 250 monthly units, then switch to non-telescopic billing above that level.

Current KSEB Domestic Tariff Slabs for 2026

The rates below come from the LT-I Domestic schedule in the Kerala State Electricity Regulatory Commission tariff order dated 5 December 2024. This column of the order applies from 1 April 2025 through 31 March 2027.

Telescopic tariff: monthly consumption up to 250 units

Separate BPL rate: Eligible BPL households with connected load up to 1,000 watts and monthly consumption up to 40 units are billed at ₹1.50 per unit with no fixed charge. That concession has specific eligibility conditions and should not be treated as the ordinary first slab.

Non-telescopic tariff: monthly consumption above 250 units

The official table labels these bands “0–300,” “0–350,” and so on. In plain language, once consumption exceeds 250 monthly units, the single rate for the relevant total-consumption band applies to the entire consumption.

What “Telescopic” and “Non-Telescopic” Mean

This difference is the most important concept in KSEB domestic bill calculation. It is also why advice such as “your last few units cost only the highest slab rate” becomes misleading after monthly consumption crosses 250 units.

KSEB Bill Calculation Example for 200 Monthly Units

At 200 units, telescopic billing applies. The energy charge is calculated block by block:

If your meter-reading period is not exactly one month, do not apply this example directly to the total units printed on the bill. The KSERC table is expressed in monthly-consumption slabs, while KSEB billing periods can differ. Use the slab treatment shown on your actual bill or KSEB’s live calculation channel.

Why a KSEB Bill Can Jump Above 250 Units

For a household close to the threshold, an air-conditioner, water heater, induction cooker or EV charger can do more than add extra units. It can change the billing method for the entire monthly consumption. The fixed-charge band also changes, and three-phase domestic users above 250 units can be affected by Time-of-Day billing.

KSEB Fixed Charges and Time-of-Day Rates

The energy charge is only one part of an LT-I domestic bill. Fixed charge depends on monthly consumption and whether the service is single-phase or three-phase.

Time-of-Day treatment for higher-use three-phase homes

The tariff order makes ToD billing applicable to LT-I domestic consumers on three-phase supply with monthly consumption above 250 units. The ruling-rate multipliers are:

• 6:00 am–6:00 pm: 90% of the normal ruling energy rate
• 6:00 pm–10:00 pm: 125% of the normal ruling energy rate
• 10:00 pm–6:00 am: 100% of the normal ruling energy rate

Check the time-zone rows on your own bill because meter capability and billing implementation affect the final calculation. These retail ToD periods should also not be confused with the separate time-zone accounting used for renewable-energy prosumers.

Other items that can change the payable amount

• electricity duty or another statutory levy;
• meter rent, where applicable;
• fuel surcharge approved through a separate proceeding;
• arrears, delayed-payment charges or previous adjustments;
• rebates, subsidies or account credits; and
• solar/prosumer import-export accounting, where applicable.

Fuel surcharge is deliberately not hard-coded in this guide because it can change independently of the base tariff schedule. The safest number is the one shown on your latest bill under the applicable current order.

Why Your Electricity Bill May Be Rising Even When Base Rates Have Not Changed

The current base LT-I schedule is published through 31 March 2027, so it is inaccurate to say KSEB automatically raises every slab each year. A higher bill can instead come from:

1. Higher monthly use: ACs, water heating, pumps, induction cooking and EV charging can materially change consumption.
2. Crossing 250 units: the account moves from telescopic to non-telescopic billing.
3. A higher fixed-charge band: fixed charge rises with consumption and differs by phase.
4. Peak-hour consumption: applicable three-phase ToD billing can raise the effective rate during 6:00 pm–10:00 pm.
5. Variable bill lines: duty, meter rent, fuel surcharge, arrears or adjustments can change the payable amount.
6. A longer reading period or estimate correction: compare current and previous meter readings and billing dates before assuming the unit rate changed.

How to Read Your KSEB Bill Before Comparing Quotes

Use the bill as a data sheet, not just a payable amount. Check these fields first:

• tariff category: usually LT-I for an ordinary residence;
• billing period and units consumed;
• single-phase or three-phase service;
• energy charge and fixed charge separately;
• ToD or zone-wise entries, if present;
• fuel surcharge, duty, meter rent and adjustments; and
• import, export and banked-energy entries for a solar prosumer.

A solar proposal based only on the rupee total can be misleading. A proper assessment should examine at least 12 months of units, daytime use, seasonal peaks, roof conditions and future loads such as an EV or additional AC.

How Rooftop Solar Changes the KSEB Bill Maths

Rooftop solar first helps by serving part of the home’s consumption while the system is generating. That can reduce electricity imported from KSEB and may reduce exposure to higher consumption bands. The financial result depends on when the home uses electricity, how the system is sized and the metering arrangement approved for that connection.

Under the final KSERC Renewable Energy and Related Matters Regulations, 2025, new domestic applicants can opt for net metering from 1 kW up to 20 kW, subject to connected-load and other conditions. The often-repeated “3 kW maximum” is not the general domestic net-metering cap; 3 kW is normally the single-phase inverter limit.

Energy accounting for prosumers is also more detailed than a simple “imports minus exports” promise. From 1 January 2026, the final regulations use time-zone accounting and provide for a 2% monthly banking charge on remaining banked units. They specify year-end settlement at ₹3.08 per kWh for existing prosumers and ₹2.79 per kWh for new solar prosumers. Fixed charge, meter rent, duty, surcharge and other applicable items can still remain, so a solar system should not be sold with a guaranteed zero-bill claim.

KSEB Tariff Slabs 2026: Frequently Asked Questions

Official Sources and Accuracy Note

• 01 KSERC OP No. 18/2023 tariff order dated 5 December 2024
  See the LT-I Domestic schedule on printed page 128 and the ToD provisions in the order.
• 02 KSERC Renewable Energy and Related Matters Regulations, 2025
  Final Kerala Gazette—not the earlier draft. Energy accounting and settlement provisions took effect on 1 January 2026.
• 03 KSEB Web Self Service
  Use the live KSEB channel to inspect or pay the bill attached to your consumer account.