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Read your electricity bill before calculating solar savings

Separate energy rates, Ft, service charges and VAT using the residential tariff snapshot.

Edited by SolarKrasibUpdated 22 September 2026Read6 min

The answer first

Electricity bills include energy charges for the tariff category, service charges, Ft and VAT. Solar savings require comparing full bills before and after installation, because every avoided kWh does not have the same average price.

PEA normal residential tariff 1.1.2 from September 2026

First 200 kWh: 3.0000 THB/kWh; kWh 201–400: 4.1584 THB; above 400: 4.3583 THB. Service charge: 24.62 THB/month. Figures exclude Ft and VAT.

Category 1.1.1 and separately assessed benefits

Category 1.1.1 has an 8.19 THB/month service charge, with the first 15 kWh at 2.3488 THB and the next 10 at 2.9882 THB, followed by 3.0000 THB up to 200 kWh. Classification depends on meter and utility conditions. The calculator does not automatically change category when solar reduces imports, or include personal subsidies or free-electricity benefits.

Ft can change: check your latest bill

The September–December 2026 Ft snapshot is 0.1623 THB/kWh. Default VAT is 7%; both are editable to match your bill. Future tariff assumptions are not advance utility announcements.

Supporting sources

  1. PEA — Electricity tariff effective September 2026 ↗
  2. PEA — Ft adjustment September–December 2026 ↗

General information for questions and preliminary estimates. Site and contract conditions need individual verification. International sources explain principles, not Thai law.

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