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Read your electricity bill
and know what you pay for

Units, customer types, progressive and TOU rates, demand, power factor, Ft and VAT, with worked examples

PEA rates from the September 2026 bill · Ft 16.23 satang/kWh for Sep–Dec 2026

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ELECTRICITY BILL · 01 / 11

What is a unit?

1 unit = 1 kilowatt-hour (kWh)

  • 1 unit = 1 kWh
  • 1,000 W for 1 hour = 1 unit
  • Units used = this reading − last reading
ELECTRICITY BILL · 02 / 11

Customer types

The customer type decides the whole formula

  • PEA has 8 customer types
  • Home 1 · Small 2 · Medium 3 · Large 4
  • Medium 30–999 kW · Large from 1,000 kW
  • Higher voltage, lower rate per unit
ELECTRICITY BILL · 03 / 11

What makes up a bill

Total = (base + Ft) × 1.07

  • Demand · energy · service charge
  • Power factor · minimum charge
  • Ft · VAT 7%
  • Total = (base + Ft) × 1.07
ELECTRICITY BILL · 04 / 11

Progressive rates for homes

Use more, and later units cost more

  • First 200 units: 3.0000 THB each
  • Units 201–400: 4.1584 THB each
  • 350 units: base 1,248.38 THB
  • With Ft + VAT: 1,396.55 THB
ELECTRICITY BILL · 05 / 11

TOU: priced by time

Peak costs more · Off Peak costs less

  • Peak 09:00–22:00 Mon–Fri
  • Off Peak nights, weekends, holidays
  • 69 kV: Peak 4.1025 · Off Peak 2.5849 THB
  • Move work to Off Peak = save
ELECTRICITY BILL · 06 / 11

Demand and minimum charge

The highest 15-minute kW is billed for the month

  • Demand = highest 15-minute average kW
  • 3.1.2: 196.26 THB/kW every month
  • Minimum charge: 70% of the 12-month peak demand
ELECTRICITY BILL · 07 / 11

Power factor charge

kVAR above 61.97% of kW · 56.07 THB per kVAR

  • kVAR above 61.97% of kW is billed
  • 56.07 THB per kVAR
  • Capacitors bring it to zero
ELECTRICITY BILL · 08 / 11

Ft and VAT

Ft Sep–Dec 2026 = 16.23 satang/kWh

  • Ft Sep–Dec 2026 = 16.23 satang/kWh
  • Ft charge = monthly kWh × Ft
  • VAT = (base + Ft) × 7%
ELECTRICITY BILL · 09 / 11

Example: medium business 3.1.2

205 kW · 48,800 kWh · 250 kVAR

  • 205 kW · 48,800 kWh · 250 kVAR
  • Base 201,020.63 THB
  • Total 223,566.73 THB
  • Demand = 20% of base
ELECTRICITY BILL · 10 / 11

Example: large business TOU 4.2.1

69 kV · Peak 964,000 · Off Peak 888,000 kWh

  • Peak 964,000 · Off Peak 888,000 kWh
  • Base 6,498,066.90 THB
  • Total 7,274,551.76 THB
  • Move 10% to Off Peak: save 146,296.64 THB
ELECTRICITY BILL · 11 / 11

Cutting costs and checking the bill

Lower kW · shift to Off Peak · fix PF · check with CDM

  • Don't start big loads together → lower demand
  • Shift work to Off Peak
  • Capacitors: PF at least 0.85
  • Check every bill with CDM meters