Thailand Off-Peak Calendar 2026: Which Days Are Cheap All Day
If your home is on a TOU meter, knowing WHICH days and hours are off-peak (the cheap window) matters as much as knowing the rate. This page collects the weekday off-peak window, weekends, and the full table of 2026 Thai public holidays that are off-peak all day — so you can plan usage for maximum saving.
TOU off-peak days for 2026: on Monday–Friday the off-peak (cheap) window is 22:00–09:00, while every Saturday, Sunday and official public holiday is off-peak for the full 24 hours (00:00–24:00). That means on weekends and public holidays, whatever time you use power it's all charged at the cheapest off-peak rate. In 2026 there are 17 official public holidays that are full off-peak days (New Year, Songkran 13–15 Apr, Labour Day, and more) — the complete table is below. This schedule is identical for the MEA (Bangkok–Nonthaburi–Samut Prakan) and the PEA (other provinces). For how many baht per unit off-peak costs, see the TOU rate table. And is switching to TOU worth it for your home? See the TOU break-even calculator.
What Do On-Peak and Off-Peak Mean? (Plain-Language Concept)
Off-peak means "the cheap time of day," and on-peak means "the expensive time of day." Under the TOU (Time-of-Use) billing system, the utility splits each day into two windows. The hours when many people use power at once (weekday daytime) are called on-peak and are priced higher, to reflect the cost of the grid running at full capacity. The hours when fewer people use power (nights, holidays) are called off-peak and are priced much lower. For TOU meters in Thailand: on Monday–Friday the on-peak window is 09:00–22:00 and off-peak is 22:00–09:00, while every Saturday, Sunday and public holiday is off-peak all day. This matters because if you SHIFT heavy loads (laundry, dryer, EV charging) out of the expensive on-peak window and into the cheap off-peak window, you genuinely save money using exactly the same amount of electricity. That is the whole point of a TOU meter.
When Is Off-Peak on Each Type of Day?
TOU electricity splits into On-Peak (expensive) and Off-Peak (cheap) by time. This page focuses on which day/time is off-peak. The table below is identical for the MEA and the PEA, for all TOU customer types:
| Type of day | Off-peak window (cheap) | Note |
|---|---|---|
| Mon–Fri (weekday) | 22:00–09:00 | 09:00–22:00 is On-Peak (expensive) |
| Saturday & Sunday | All day (00:00–24:00) | No On-Peak — cheap all day |
| Public holiday | All day (00:00–24:00) | Official government public holidays |
Note: the days that count as off-peak are the official government public holidays only — not a private company's internal substitute days. On these days there is no On-Peak window at all; every unit is charged at the off-peak rate.
Table: 2026 Public Holidays That Are Off-Peak All Day
These are the 2026 (B.E. 2569) official Thai public holidays. Every date in this table is off-peak for the full 24 hours — ideal days to shift heavy loads (laundry, dryer, EV charging, water pumps). The Cabinet may add bridge/extra holidays later in the year; please re-confirm any added days with the electricity authority:
| Date | Weekday | Holiday |
|---|---|---|
| 1 Jan | Thursday | New Year's Day |
| 2 Jan | Friday | Cabinet special holiday |
| 3 Mar | Tuesday | Makha Bucha |
| 6 Apr | Monday | Chakri Memorial Day |
| 13 Apr | Monday | Songkran |
| 14 Apr | Tuesday | Songkran |
| 15 Apr | Wednesday | Songkran |
| 1 May | Friday | National Labour Day |
| 4 May | Monday | Coronation Day |
| 1 Jun | Monday | Substitution for Visakha Bucha (31 May) |
| 3 Jun | Wednesday | H.M. Queen Suthida's Birthday |
| 28 Jul | Tuesday | H.M. King Vajiralongkorn's Birthday |
| 29 Jul | Wednesday | Asalha Bucha |
| 12 Aug | Wednesday | H.M. Queen Sirikit's Birthday / Mother's Day |
| 13 Oct | Tuesday | H.M. King Bhumibol Memorial Day |
| 23 Oct | Friday | Chulalongkorn Day |
| 7 Dec | Monday | Substitution for Father's/National Day (5 Dec) |
| 10 Dec | Thursday | Constitution Day |
| 31 Dec | Thursday | New Year's Eve |
* All 17 dates were re-verified against the 2026 (B.E. 2569) public/financial-institution holiday announcement (Bank of Thailand Notification No. 31/2568, dated 5 Aug 2025). The substitution days 1 Jun (Visakha Bucha) and 7 Dec (Father's/National Day) are gazetted public holidays, so they are full off-peak days. A “bank-only special holiday” (e.g. 16 Oct 2026 for the Bangkok area) is a financial-institution holiday only, NOT a public holiday, and therefore does NOT count as a TOU off-peak day. Makha, Visakha and Asalha Bucha follow the lunar calendar and may differ slightly between calendars; Khao Phansa (the day after Asalha Bucha) is a holiday for some agencies but not all. To be certain whether a given day is off-peak, call the MEA on 1130 or the PEA on 1129.
How to Use This Off-Peak Calendar to Save
The trick is to shift as many heavy, time-flexible loads as possible into off-peak — both the weekday night window and full holiday days:
Use appliance timers — set the washer, dryer and dishwasher to start after 22:00 on weekdays.
Charge your EV at night or on holidays — schedule charging to start after 22:00, or charge on Saturdays/Sundays/holidays when it's cheap all day.
Batch heavy chores onto holidays — since public holidays and weekends are off-peak all day, they're ideal for power-heavy tasks like big ironing sessions, machine cleaning, or electric baking/grilling.
Plan ahead with the table above — mark long breaks like Songkran (13–15 Apr) and New Year as windows where you can use power freely at the cheap rate.
To see the per-unit rate of each window and a worked saving figure, see the TOU rate table 2026. And if you don't yet have a TOU meter, see how to switch in the TOU meter application guide.
About this page
Compiled by the CapSolar team, led by Frank Lee (Founder). The holiday table and off-peak windows are checked against the 2026 public/financial-institution holiday announcement and MEA/PEA notices. This page is general information, not personal advice — confirm any added (bridge/substitution) holidays and their off-peak status with your local electricity authority before planning.
FAQ
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