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Residential Electricity Bill Calculator

Enter your monthly kWh and billing month to get a KEPCO residential bill line by line — basic charge, tiered energy charge, climate and fuel-adjustment charges, VAT and the power-industry fund. Summer tiers (Jul–Aug) switch automatically, and you can see what crossing a tier or running an extra appliance would cost. Rates as of October 2026; everything runs in your browser.

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Estimated bill · 350kWh · Other months · low voltage

70,640 KRW

Average 201.8 KRW/kWh · tier 2 basic charge

Basic chargetier 21,600 KRW
└ Tier 1 (1–200 kWh)200kWh × 120.024,000 KRW
└ Tier 2 (201–400 kWh)150kWh × 214.632,190 KRW
Energy chargetruncated56,190 KRW
Climate & environment350 × 9.03,150 KRW
Fuel cost adjustment350 × 51,750 KRW
Electricity subtotal62,690 KRW
VAT 10%rounded6,269 KRW
Power Industry Fund 2.7%floored to 101,690 KRW
Amount billedfloored to 1070,640 KRW

What more usage costs

50 kWh left until the next boundary (400 kWh). Crossing it by 1 kWh adds 6,780 KRW (incl. the basic-charge jump).

+1 kWh→ 351 kWh+260 KRW (per kWh 260)
+10 kWh→ 360 kWh+2,580 KRW (per kWh 258)
+50 kWh→ 400 kWh+12,890 KRW (per kWh 258)
+100 kWh→ 450 kWh+37,410 KRW (per kWh 374)
Save 10 kWh-2,570 KRW

Appliance usage estimator

Watts × hours/day × days × units ÷ 1,000 = kWh per month. Defaults are typical values — edit them from your product label.

= 168 kWh/mo

Appliances total

168 kWh

On top of 350 kWh this adds 62,030 KRW, for a bill of 132,670 KRW.

Tariff: KEPCO residential (effective 2023-05-16) · climate 9.0 KRW/kWh · fuel adjustment +5.0 (Q4 2026) · fund 2.7% (since 2025-07-01) · checked 2026-10-04. Estimate only — welfare/large-family discounts, auto-pay discount and pro-rating across season boundaries are not modelled.

How to use

  1. Enter this month’s usage in kWh from your bill (or build it with the appliance estimator).
  2. Pick the billing month — July/August use summer tiers; Dec–Feb add the super-user rate above 1,000 kWh.
  3. Choose high voltage only if your apartment buys power at high voltage.
  4. Compare the breakdown with your bill and check how far you are from the next tier.

Concept

How the residential tariff works

KEPCO bills homes on a three-tier progressive tariff: the more you use in a month, the higher the per-kWh rate for the portion above each boundary, and a single basic charge set by the tier your total falls in. In July and August the boundaries widen from 200/400 kWh to 300/450 kWh. Unit rates have been unchanged since 16 May 2023.

TierOther months / SummerLow basicLow /kWhHigh basicHigh /kWh
Tier 1≤200 / ≤300 kWh910120.0730105.0
Tier 2201–400 / 301–4501,600214.61,260174.0
Tier 3>400 / >4507,300307.36,060242.3
Super-user>1,000 kWh (summer & winter)7,300736.26,060593.3

Source: KEPCO residential tariff (effective 2023-05-16), cyber.kepco.co.kr — checked Oct 2026. Amounts in KRW.

subtotal = basic + Σ(tier kWh × rate) + kWh × 9.0 (climate) + kWh × 5.0 (fuel adj.)
VAT      = subtotal × 10%  (rounded)
fund     = subtotal × 2.7% (floored to 10 KRW)
bill     = subtotal + VAT + fund  (floored to 10 KRW)

Example, 350 kWh in October: 1,600 + 56,190 + 3,150 + 1,750 = 62,690
  + 6,269 VAT + 1,690 fund = 70,649 → 70,640 KRW

Common mistakes: using the old 3.7% fund rate, applying VAT only to the energy charge, treating June or September as summer, and applying the super-user rate outside summer and winter. The estimate ignores discounts and pro-rating when a billing period spans two seasons.

FAQ

Why does my bill differ slightly?

Usually because the meter-reading period straddles a season boundary (usage is pro-rated by days), an auto-pay discount (1% of last month, max 1,000 KRW), or welfare/large-family discounts. This calculator treats the month as one season with no discounts.

Low or high voltage?

Houses, villas and most apartment units are low voltage. Some apartment complexes buy power at high voltage under a single contract and apply the high-voltage residential tariff to each unit — ask your management office.

How bad is crossing a tier?

Only the kWh above the boundary pay the higher rate, but the basic charge jumps (910 → 1,600 → 7,300 KRW). Going from 400 to 401 kWh outside summer adds over 6,000 KRW to the bill.

Why 2.7% for the power fund?

The Electric Power Industry Basis Fund levy was cut from 3.7% to 3.2% on 1 July 2024 and to 2.7% on 1 July 2025. Older calculators still use 3.7%.

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