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Electricity Bill Calculator
Accurate estimates for Kerala · KSEB
Estimated bi-monthly bill
₹1,439.75
≈ ₹719.88 / month (150 units)
| 1–100 @ ₹3.35 × 100 | ₹335.00 |
| 101–200 @ ₹4.25 × 100 | ₹425.00 |
| 201–300 @ ₹5.35 × 100 | ₹535.00 |
| Energy charge | ₹1,295.00 |
| Fuel cost adjustment (₹0/unit) | ₹0.00 |
| Fixed charge (single-phase) | ₹80.00 |
| Electricity duty (5%) | ₹64.75 |
| Total | ₹1,439.75 |
Worked example
A 300-unit bi-monthly Kerala residential bill (single-phase) works out to ₹0123456789012345678901234567890123456789 — about ₹719.88 per month. That is ₹1,295.00 energy charge + ₹80.00 fixed charge + ₹64.75 duty.
See the full breakdown ↓Have a fixed budget? Work backwards
Enter what you want to spend, and we'll tell you the maximum units that stays within it — the exact inverse of the calculator above.
Budget → Units Calculator
Tell us your target bill, we'll tell you how many units that buys
You can use up to
221 units
for a bi-monthly bill of ₹995.97 (within your ₹1,000.00 budget)
How to use this calculator
- 1Select your state — it's pre-selected for this page
- 2Enter the units consumed shown on your bill, or your meter readings
- 3Choose your connection phase (single or three) if applicable
- 4Review the itemised slab-by-slab result below the calculator
The bi-monthly rule
KSEB bills bi-monthly. The units you enter represent your full ~60-day billing period — not a single month. To compare against a monthly figure, we divide the total by 2, shown as the monthly-equivalent on your result.
The 250-unit non-telescopic cliff
≤250 units/month avg
Telescopic (slab-wise)
>250 units/month avg
Flat rate on ALL units
Cross a monthly average of 250 units and KSEB switches your entire bi-monthly consumption to a single higher non-telescopic rate — not just the units above 250. This is the single most misunderstood rule on a KSEB bill.
Kerala residential tariff slabs
| Slab (units) | Rate (₹/unit) |
|---|---|
| 0–100 | ₹3.35 |
| 101–200 | ₹4.25 |
| 201–300 | ₹5.35 |
| 301–400 | ₹7.20 |
| 401–500 | ₹8.50 |
| 501–above | ₹8.50 |
| Fixed charge | ₹80 / ₹220 (single / three-phase) |
| Electricity duty | 5% |
Effective from 1 April 2025 · Verified 29 August 2026 · source order
Two worked examples
Lower usage
₹1,439.75
300 units · ₹1,295.00 energy + ₹80.00 fixed
Higher usage
₹5,051.75
720 units · ₹4,735.00 energy + ₹80.00 fixed + ₹236.75 duty
Common KSEB bill traps
The 250-unit cliff is the single biggest trap
Below a 250 units/month average, KSEB charges telescopically. The moment your average crosses 250, your entire bi-monthly consumption is re-billed at a single higher non-telescopic rate — not just the units above 250. This calculator only models the telescopic range and is not accurate above it.
Bi-monthly bill, monthly-average trigger
Because the 250-unit threshold is assessed on your monthly average (bi-monthly total ÷ 2), a 501-unit bi-monthly bill crosses the cliff even though “501” doesn't look close to “250” at first glance.
Fixed charge depends on phase
KSEB's fixed charge is ₹80 for single-phase and ₹220 for three-phase connections per bi-monthly cycle — a similar structure to Tamil Nadu's, but at different amounts.
How the KSEB bill is calculated
The 250-unit non-telescopic cliff
Up to 250 units a month, each slab is charged at its own rate (telescopic). The moment your monthly average crosses 250 units, KSEB re-bills your entire consumption at a single higher non-telescopic rate — so 251 units can cost noticeably more than 250. This calculator models the telescopic range only and is not accurate above 250 units/month.
Bi-monthly billing, monthly assessment
Bills arrive every two months, but the slab thresholds are applied to the monthly average. Enter your two-month units here; the calculator uses bi-monthly slab widths (twice the monthly figures) and shows a monthly-equivalent total.
Telescopic slabs and fixed charge
Monthly telescopic rates run ₹3.35 (0–50), ₹4.25 (51–100), ₹5.35 (101–150), ₹7.20 (151–200) and ₹8.50 (201–250), plus a fixed charge of ₹40/month single-phase and 5% electricity duty.
Your bill, component by component
Based on the 300-unit example above. Expand each line for what it means and whether you can influence it.
Energy chargeReducible₹1,295.00+
Priced across telescopic slabs — the more you use, the higher the marginal rate. Shifting usage below your next slab threshold lowers this line directly. This example totals ₹1,295.00.
Fuel cost adjustment (FCA)Set by DISCOM₹0.00+
A ₹0/unit pass-through surcharge that tracks the DISCOM's power-purchase cost. It applies equally to every consumer on this tariff and isn't something you can reduce by changing usage.
Fixed chargeFixed₹80.00+
Charged regardless of how many units you use (single-phase). The only way to change this line is to change your phase, sanctioned load, or connection type.
Electricity dutyStatutory₹64.75+
A 5% state government levy on the energy charge — set by statute, not by the DISCOM, and not reducible by usage pattern.
What's included in your bill
| Component | What it is | Typical range |
|---|---|---|
| Energy charge | Units × slab rate, telescopic | ₹3.35–₹8.50/unit |
| Fixed charge | Flat, independent of usage | ₹80 / ₹220 (single / three-phase) |
| Electricity duty | State government levy | 5% |
How to read your meter
Digital meters show a running total in kWh ("units") on an LCD display — write down the number before the decimal point. To find your consumption for a billing period, subtract your previous reading from your current reading; that is exactly what the "Meter reading" mode in the calculator above does for you. Analog meters use a set of dial gauges read left to right — note the number the pointer has just passed on each dial.
☀️ See how much solar could save you in Kerala
Rooftop solar can cut this bill sharply. Check your payback period and PM Surya Ghar subsidy in under a minute.
Tools that cut your bill
Swap CFL for LED bulbs
Replacing a 15W CFL with a 9W LED bulb, run 6 hrs/day, saves about ₹117.34/year at Kerala's top slab rate (₹8.93/unit) — per bulb.
Upgrade to a 5-star AC
A 1.5 ton 5-star AC vs 3-star, run 6 hrs/day, saves about ₹4,977.70/year in Kerala.
See the full comparison →How does KSEB compare?
KSEB
Kerala
Top slab rate
₹8.50/unit
Base slab
₹3.35
Slabs
6
Billing
bi-monthly
Duty
5%
TNEB
Tamil Nadu
Top slab rate
₹6.40/unit
↓ 25% cheaper than KSEB
Base slab
₹2.25
Slabs
4
Billing
bi-monthly
Duty
0%
BESCOM
Karnataka
Top slab rate
₹8.60/unit
↑ 1% costlier than KSEB
Base slab
₹5.90
Slabs
3
Billing
monthly
Duty
0%
APSPDCL
Andhra Pradesh
Top slab rate
₹9.75/unit
↑ 15% costlier than KSEB
Base slab
₹1.90
Slabs
6
Billing
monthly
Duty
0%
Top Slab Rate Comparison
KSEB's top domestic slab rate is ₹8.50/unit — cheaper than TNEB (₹6.40/unit), — more expensive than BESCOM (₹8.60/unit), — more expensive than APSPDCL (₹9.75/unit). Billing cycles also differ: KSEB bills bi-monthly, while TNEB bills bi-monthly, BESCOM bills monthly, APSPDCL bills monthly.
Tips to reduce your KSEB bill
- Where practical, keep usage below your next slab threshold — the marginal units above ₹8.50/unit cost the most.
- For high-usage households, rooftop solar can offset your most expensive top-slab units — see the solar section above.
Net metering explained
Net metering lets a rooftop solar system export surplus power back to the grid through your existing meter, which runs in reverse. At billing time, your DISCOM credits the exported units against what you drew from the grid — you're billed only for the net difference. Combined with telescopic slabs, this typically offsets your most expensive units first. Estimate your solar payback →
About KSEB
The Kerala State Electricity Board (KSEB) began functioning on 31 March 1957. Under the Electricity Act 2003, it was converted into a company — Kerala State Electricity Board Limited (KSEBL) — incorporated on 14 January 2011 and operating independently from 1 November 2013. “KSEB” remains the name most commonly used for bills and customer service.
KSEB distributes power across nearly all of Kerala, with a few exceptions: the Thrissur Municipal Corporation area, the Munnar (Kannan Devan Hills) area, and several small industrial-park zones are served by separate, smaller licensees.
Does KSEB supply electricity to Kochi and Thiruvananthapuram?
Yes — KSEB covers both Kochi and Thiruvananthapuram (Trivandrum) along with the rest of Kerala. The notable exceptions are the Thrissur Municipal Corporation area and Munnar (Kannan Devan Hills), which have their own separate distribution licensees.
How to check and pay your bill
- 1Visit the KSEB Web Self Service portal or open the KSEB Mobile App
- 2Enter your Consumer Number to fetch your current bill
- 3Verify the amount and pay via UPI, card or net banking
- 4Save the payment confirmation for your records
Official portal
wss.kseb.in (KSEB Web Self Service)
Helpline
1912 / 0471-2555544 (24×7)
Frequently asked questions
What is the 250-unit rule in Kerala?
Below 250 units/month KSEB charges telescopically (each slab at its own rate). Above 250 units/month it switches to non-telescopic — your whole consumption is billed at one higher rate, which this calculator does not model.
KSEB bills me every two months — how do slabs work?
Slabs are assessed on the monthly average, i.e. your two-month units ÷ 2. The calculator uses bi-monthly slab widths and shows a monthly-equivalent figure.
Why might my real KSEB bill differ above 250 units?
Because the non-telescopic regime above 250 units/month re-prices your entire usage at a single higher rate. Treat estimates above 500 bi-monthly units as indicative only.
Is there an electricity duty in Kerala?
Yes, a 5% electricity duty applies on the energy charge, along with a per-month fixed charge billed bi-monthly.
Does KSEB supply electricity to all of Kerala?
Almost all — KSEB Limited (KSEBL) covers the entire state except the Thrissur Municipal Corporation area, the Munnar (Kannan Devan Hills) area, and a handful of small industrial-park licensees, which have their own separate distribution licensees.
How do I check or pay my KSEB bill online?
Pay via the official KSEB Web Self Service portal at wss.kseb.in, or the KSEB Mobile App. For queries or outages, call the 24×7 helpline 1912 or 0471-2555544.
What's the difference between KSEB and KSEB Limited (KSEBL)?
The original Kerala State Electricity Board (KSEB), formed in 1957, was converted into a company — Kerala State Electricity Board Limited (KSEBL) — incorporated in January 2011 and operational from 1 November 2013. "KSEB" is still the everyday name people use.