Thailand Off-Peak Calendar 2026: Which Days Are Cheap All Day

Month-by-Month Off-Peak Calendar 2026 (MEA & PEA)

The calendar below covers all 12 months of 2026 (B.E. 2569) and highlights the days that are off-peak for the full 24 hours — every Saturday, every Sunday, and the 19 public holidays listed in MEA Announcement No. 32/2568. Un-highlighted weekdays are ordinary days: on-peak (expensive) 09:00–22:00 and off-peak (cheap) 22:00–09:00. The same day set applies to both the Metropolitan Electricity Authority (MEA) and the Provincial Electricity Authority (PEA), because both cite the same ERC announcement of 7 April 2023.

* Cells with a dashed border are substitution holidays or cabinet-added special holidays (2 Jan, 1 Jun and 7 Dec 2026) that are NOT off-peak — the normal 09:00–22:00 on-peak window still applies. Neither the MEA nor the PEA official calendar treats those three days as off-peak. Actual holidays that fall on a weekend (Visakha Bucha on 31 May, Father's/National Day on 5 Dec) are off-peak as usual, since Saturdays and Sundays are off-peak anyway. If you are unsure about a date, call the MEA on 1130 or the PEA on 1129.

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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:

Note: per the ERC announcement that the MEA/PEA apply, the days counted as all-day off-peak are Saturdays, Sundays, National Labour Day and regular public holidays — but NOT Royal Ploughing Day, substitution holidays, or special extra holidays added by Cabinet resolution. On the qualifying 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 all 19 full off-peak holidays for 2026 (B.E. 2569) per MEA Announcement No. 32/2568. 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). Note that the utility counts the ACTUAL holiday even when it falls on a weekend; substitution days do not count, and any special holidays the Cabinet adds later do not count either unless the utility officially announces them:

* All 19 dates match MEA Announcement No. 32/2568 (TOU periods for B.E. 2569, dated 15 Dec 2025), which cites the ERC announcement. Note that the utility counts the ACTUAL holiday even when it falls on a weekend (e.g. Visakha Bucha Sun 31 May, and Father's/National Day Sat 5 Dec). Substitution holidays (e.g. Mon 1 Jun and Mon 7 Dec), Royal Ploughing Day, and special cabinet-added holidays (e.g. Fri 2 Jan 2026) are NOT off-peak — they are ordinary weekdays with the normal 09:00–22:00 on-peak window. Bank/financial-institution holidays are likewise irrelevant to TOU electricity. 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:

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.

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