Thailand Residential Electricity Rate PEA/MEA 2026
Check the current PEA/MEA residential rate, Jan-Apr 2026 comparison, Ft surcharge, and commercial/industrial TOU tables in one ERC-sourced guide.
Published 2026-03-26 · Last updated 2026-05-04 · Reviewed by the CapSolar Team
Thailand's current residential electricity rate is 3.95 THB/kWh for May-Aug 2026 (MEA+PEA blended, Ft 0.1623 THB/kWh). The previous Jan-Apr 2026 period was 3.88 THB/kWh. PEA and MEA use the same residential structure; business and industrial TOU tables are below.
Quick Answer - PEA/MEA Residential Rate
- Current residential retail (blended national)
- 3.95 THB/kWh (May-Aug 2026)
- Previous period Jan-Apr 2026
- 3.88 THB/kWh
- Source
- ERC 2026-04-01 announcement and PEA Ft May-Aug 2026 = 0.1623 THB/kWh, applied nationally via MEA + PEA
PEA vs MEA — What's the Difference?
Thailand has 2 main electricity distribution authorities covering different areas. Who you pay depends on where your business is located.
MEA — Metropolitan Electricity Authority
Service area: Bangkok, Nonthaburi, Samut Prakan (only 3 provinces)
PEA — Provincial Electricity Authority
Service area: The remaining 74 provinces nationwide
Tariff rates from both authorities are very similar, but there may be slight differences in monthly service charges and Ft rate adjustments, which may not be synchronized.
5 Thailand Electricity Customer Categories — Which Do You Belong To?
Thailand's ERC classifies electricity users into 5 main categories per the most recent notification (ERC 2024), segmented by consumption volume and business type. Your category directly determines your tariff rate and bill structure.
Category 1 — Residential
Residents in houses, apartments, condos. Subdivided into 1.1 (≤ 150 kWh/mo, special rate) and 1.2 (> 150 kWh/mo, standard rate). Progressive block pricing (higher usage = higher per-unit rate).
Category 2 — Small Business
Shops, offices, restaurants with demand < 30 kW (roughly ≤ 10,000 kWh/mo). Flat-rate pricing (same rate all day), no Demand Charge.
Category 3 — Medium Business
Businesses and factories with demand 30-999 kW. Two options: Flat rate or TOU (time-of-use). Most medium factories choose TOU since they run daytime. Demand Charge applies.
Category 4 — Large Industrial
Large industrial plants ≥ 1,000 kW (roughly ≥ 350,000 kWh/mo). TOU mandatory with high Demand Charge. This group benefits most from solar because solar produces exclusively during On-Peak.
Category 5 — Specific Business
Businesses eligible for special rates: hotels, hospitals, government offices, educational institutions, religious sites. Flat-rate pricing but typically cheaper than Cat 2 to support public services.
Thailand 2026 Tariff Rate Table — Categories 1-5 (THB/kWh)
The table below summarizes base energy rates (before Ft and VAT) per the latest ERC announcement, segmented by customer category. The 2026 tariff structure is identical to 2025 — only the numerical values are adjusted each quarter.
| Customer Category | Rate Structure | Base Rate (THB/kWh) |
|---|---|---|
| Cat 1.2 Residential > 150 kWh/mo | Progressive block | 3.2484THB/kWh |
| Cat 2 Small Business < 30 kW | Flat | ~3.78–4.20 THB/kWh |
| Cat 3 Medium Business 30-999 kW | TOU (On/Off Peak) | On-Peak: 4.1839 · Off-Peak: 2.6037THB/kWh |
| Cat 4 Large Industrial ≥ 1,000 kW | TOU + Demand Charge | On-Peak: 4.1025 · Off-Peak: 2.5849THB/kWh · Demand: 74.14THB/kW-mo |
| Cat 5 Specific Business (hotels/hospitals) | Flat | 3.1097 THB/kWh |
| Ft (May-Aug 2026, THB/kWh) | 0.1623THB/kWh | |
Note: base rates exclude Ft + 7% VAT + monthly service fee; the Ft row shows the current May-Aug 2026 value. For TOU: On-Peak = 09:00-22:00 Mon-Fri; Off-Peak = 22:00-09:00 Mon-Fri and all day Sat-Sun-holidays.
TOU — Time of Use Tariff
TOU (Time of Use) is an electricity pricing system that charges different rates depending on the time of day. Like phone calls that cost more during business hours — On-Peak periods are more expensive than Off-Peak.
09:00 - 22:00 Mon-Fri
4.1025THB/kWh
22:00 - 09:00 + Weekends/Holidays
2.5849THB/kWh
Peak Solar Generation
Solar panels generate power during daytime, which perfectly matches On-Peak hours! Every kWh produced replaces the most expensive electricity.
Why Should Factories Use TOU?
For factories using lots of daytime power, switching to TOU combined with solar maximizes savings — solar produces power exactly when electricity is most expensive.
Ft — The Fluctuating Fuel Charge
Ft (Float time) is an additional charge reflecting fuel costs for electricity generation. Simply put, when natural gas or oil prices rise, Ft increases, pushing your total electricity bill higher.
Ft is adjusted every 4 months by the Energy Regulatory Commission (ERC). During 2022-2024, Ft surged dramatically due to the global energy crisis, causing factory electricity bills to increase 20-40% compared to pre-crisis levels.
How Does Solar Protect Against Ft?
Solar electricity has zero Ft because it uses no fuel. The higher Ft goes, the more you save — every solar kWh replaces grid power that includes expensive Ft charges.
Demand Charge — The Hidden Bill Trap Factories Must Know
Demand Charge is based on your peak power draw in a month (measured as highest 15-minute average) multiplied by the monthly demand rate. Unlike Energy Charge which is per-kWh, Demand Charge is per-kW of peak.
Example: a factory normally uses 500 kW but starts 2-3 machines simultaneously at 10:00, pushing the 15-minute peak to 800 kW. That month's Demand Charge is calculated on 800 kW, even though average draw is only 500 kW.
For Category 4.2 TOU at ≥69 kV the 2026 Demand Charge is 74.14 THB/kW-month — a 1 MW (1,000 kW) factory adds ~74,140 THB/month. Lower-voltage tiers: 132.93 THB/kW at 12–24 kV, 210.00 THB/kW at <12 kV.
Solar reduces Demand Charge
Solar reduces Demand Charge indirectly: when panels produce during daytime (aligned with peak hours), the grid draw drops, which lowers the measured 15-minute peak. Many factories see Demand Charge fall 15-25% after solar install.
What Does PDP 2024 Mean for Factory Owners?
Thailand's Power Development Plan 2024 (PDP 2024), published by the Energy Policy and Planning Office (EPPO), targets renewable energy — especially solar — reaching 51% of total generation capacity by 2037. This directly shapes long-term tariff structure.
Three implications for factories: (1) fossil-fuel price volatility continues, Ft trending upward; (2) solar self-consumption is backed by expanding net-metering and rooftop quotas; (3) Direct PPA (companies buying power direct from private generators) is opening in 2026-2027, expanding cost-saving options.
Worked Example — How Much Does a 5 MW Factory Pay Per Month?
Assume a 5,000 kW industrial factory (Cat 4.2 TOU) using 2,000,000 kWh/month: 65% On-Peak (1,300,000 kWh) + 35% Off-Peak (700,000 kWh), with measured peak demand of 4,500 kW.
| Line item | Formula | Amount |
|---|---|---|
| Energy On-Peak | 1,300,000 × 4.1025 = 5,333,250 THB | |
| Energy Off-Peak | 700,000 × 2.5849 = 1,809,430 THB | |
| Demand Charge | 4,500 kW × 74.14 = 333,630 THB | |
| Ft charge | 2,000,000 × 0.1623 = 324,600 THB | |
| Service fee + 7% VAT | ~6-8% of subtotal (≈ 468,000-624,000 THB) | |
Subtotal ≈ 7,800,900 THB/month (Energy + Demand + Ft before service+VAT), using the current May-Aug 2026 Ft value of 0.1623 THB/kWh. Installing a 3 MW rooftop solar system (2,500 kWh/kW/yr) cuts the total bill ~30-45%, depending on how much generation lands during On-Peak.
What Makes Up Your Electricity Bill?
Demand Charge
~10-15%Based on your peak 15-minute power demand (kW) multiplied by the demand rate — higher peaks mean higher charges
Energy Charge
~50-60%Based on actual kWh consumed multiplied by the energy rate (TOU or Normal) — the largest portion of your bill
Ft Charge (Fuel)
~15-25%Variable fuel cost adjusted every 4 months — uncontrollable, but solar reduces its impact
Service Fee + 7% VAT
~10-15%Fixed monthly service fee + 7% VAT calculated on the total amount
How to Calculate Your Factory's Actual Electricity Bill — 5 Steps
Step 1: Identify your utility (PEA or MEA)
Open your latest electricity bill and check the utility logo. If your facility is in Bangkok, Nonthaburi, or Samut Prakan, you're a MEA customer. Everywhere else is PEA.
Step 2: Classify your customer category (1-5)
Check Contract Capacity (kW) on your bill: < 30 kW = Cat 2; 30-999 kW = Cat 3; ≥ 1,000 kW = Cat 4; specific business = Cat 5; residential = Cat 1.
Step 3: Choose between Flat and TOU
If you're Cat 3, you can choose TOU or Flat (Cat 4 must use TOU). Factories running only daytime (9:00-17:00) should pick TOU. For 24-hour operations, run a comparison before deciding.
Step 4: Calculate Energy + Demand + Ft + service fee + VAT
Energy Charge = kWh × rate (split On-Peak/Off-Peak if TOU); Demand Charge = peak kW × demand rate; Ft = total kWh × latest Ft value; then add monthly service fee and multiply by 7% VAT.
Step 5: Compare with a Solar PPA
Plug your numbers into our Bill Analyzer tool to see how a self-consumption solar install or a PPA contract would reduce your bill. Most Cat 4 factories save 30-45% in year 1.
How Can Solar Reduce Your Electricity Bill?
Solar panels generate electricity during daytime On-Peak hours when rates are highest. Every kWh produced saves ~5.1 THB (including Ft) instead of ~2.6 THB during Off-Peak.
For TOU users, solar is the perfect partner — the more expensive On-Peak rates get, the more solar saves. No more worrying about Ft increases.
Try Analyzing Your Electricity Bill
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Written and Reviewed by the CapSolar Team
Written by CapSolar's in-house engineering and advisory team — 16.5 MWp installed across 8 sites in Thailand, 15+ years combined team experience. Specializing in PEA/MEA tariff structure analysis and ERC regulatory compliance.
Technical review: CapSolar Engineering Lead (licensed electrical engineer, Thailand).
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