Is the TOU Tariff Right for You? Check Before Switching to Reduce Business Costs

For business owners, industrial factories, or large commercial buildings, “electricity costs” are not just a general utility expense but a variable cost that directly impacts net profit. In an era of volatile energy prices, efficient electricity management is an issue that cannot be overlooked. One of the most discussed variables is switching to the TOU billing system. While many have heard of TOU, some may still be unsure of how it works, what constitutes On-Peak or Off-Peak hours, how it impacts billing, and whether it truly reduces costs. This article will provide the answers.

What is the TOU Tariff?

Managing costs with a TOU meter is only effective when you understand the specific schedule. The electricity authorities do not just divide by day and night, but also by holidays. As of 2026, the On-Peak and Off-Peak schedules are as follows:

• On-Peak (High Rate): Monday – Friday, 09:00 AM to 10:00 PM. 
• Off-Peak (Low Rate): Monday – Friday, 10:00 PM to 09:00 AM, as well as Saturdays, Sundays, National Labour Day, and official public holidays throughout the full 24 hours.

This means if an organization operates during standard office hours (08:00 AM – 05:00 PM), almost all electricity usage will fall within the On-Peak period.

TOU Rates per Unit in 2026: Comparing the Gap for Businesses

Cost management through a TOU (Time-of-Use) meter is only effective when the specific schedule is clearly understood. This is because electricity authorities do not simply distinguish between day and night, but also categorize rates based on specific holidays. For the year 2026, the On-Peak and Off-Peak electricity rate details are as follows:

• On-Peak (High Rate Period): Monday – Friday, from 09:00 AM to 10:00 PM.

• Off-Peak (Low Rate Period): Monday – Friday, from 10:00 PM to 09:00 AM.

• Off-Peak (24 Hours): Saturdays, Sundays, National Labour Day, and official public holidays.

This means that if an organization operates during standard office hours (08:00 AM – 05:00 PM), almost all electricity consumption will fall entirely within the On-Peak period.

How much is the TOU electricity rate per unit in 2026? Comparison gaps that businesses must know

To clearly illustrate why businesses must prioritize TOU (Time-of-Use) rates, the following example shows the time-of-use rates for small businesses

As shown, the difference in price per unit between these two periods is nearly twofold. If a factory or building consuming hundreds of thousands of units per month can shift even a portion of its operations to the Off-Peak period, it will result in a massive reduction in expenses.

Is a TOU Meter Truly Worth It for Your Business?

While Off-Peak rates are attractive, switching to a TOU meter may not be the answer for every business. Check if your organization fits these profiles

Who Benefits:

• Factories with Night Shifts: If the majority of electricity usage occurs after 10:00 PM, savings will be substantial.
• Businesses running Servers or Heavy Machinery on Holidays: Such as Data Centers or 7-day-a-week factories, as they benefit from Off-Peak rates all day on weekends.
• Businesses with Electric Vehicle (EV) Charging: Companies with EV delivery fleets or transport vehicles that charge overnight.

Who Might Pay More:

• Standard Offices or Factories: Those operating primarily during 08:00 AM – 05:00 PM and closing on weekends. Since all working hours fall into the On-Peak period at a rate of nearly 6 Baht per unit, the total bill may increase immediately.

A Better Alternative When You Can’t Avoid On-Peak Hours

If your business must run machinery during the day and cannot shift operations to the night, installing solar panels is the ultimate solution to bridge the TOU gap. Since solar panels produce maximum power during the day—perfectly aligning with On-Peak hours—generating your own electricity effectively “cuts out” the most expensive units. This allows businesses to save significantly on electricity bills without changing their working hours.

Install Solar with Solar PPM: Your Partner in Cost Control

If adjusting your consumption behavior to the TOU schedule is difficult, consulting a specialized solar installation company will provide a clearer picture of your break-even point.

Solar PPM: Your Comprehensive Energy Partner

• Manufacturer and Assembler: We ensure quality with solar panels manufactured in Thailand to international standards, allowing for better cost and quality control.
• Expertise in All Installation Types: We have the experience to design solar systems tailored to the specific structure of any business.
• Professional Team: Managed by experienced engineers and technicians, ensuring high safety and engineering standards.
• Trusted for Large-Scale Projects: Specialized in managing industrial-scale (Utility Scale) projects with guaranteed long-term system stability.

Do not let On-Peak hours consume your business profits. Consult the Solar PPM engineering team today to evaluate your cost-effectiveness. We offer free consultations and site surveys.

For more details, contact:

• Tel :  02-628-6100 ext. 801
• Email : epc1@solarppm.com 
• Line : @solarppm

Frequently Asked Questions about TOU Rates (FAQs)

Q: Is there a cost to switch to a TOU meter?

A: Yes, there is a fee for switching from a standard meter to a TOU meter as determined by the Provincial Electricity Authority (PEA) or Metropolitan Electricity Authority (MEA). This includes equipment inspection and installation service fees based on the meter size.

Q: Which types of businesses should NOT switch to TOU?

A: Businesses that operate almost exclusively during the day, such as small offices or schools that are closed on weekends and do not run systems at night. Switching to TOU may increase their total bill because On-Peak rates are higher than standard flat rates.

Q: Do the electricity authorities change On-Peak or Off-Peak times?

A: Currently, in 2026, the standard time criteria remain the same. However, entrepreneurs should follow annual announcements from the PEA or MEA, as adjustments may occur according to government energy management policies.