What is TOU? How is it different from normal rates?

TOU (Time of Use) is a time-based electricity rate system. On-Peak (09:00-22:00, Mon-Fri) costs approximately 5.1 THB/kWh, while Off-Peak (22:00-09:00 plus weekends) costs approximately 2.6 THB/kWh. Unlike the normal flat rate charged throughout the day, TOU varies by time. Businesses using more electricity during daytime benefit more from solar panels since they generate power during expensive On-Peak hours.

What is the Ft charge? Why does my electricity bill change every month?

Ft (Float time) is a fuel surcharge based on global fuel prices (natural gas, coal, etc.) used in electricity generation. Thailand's Energy Regulatory Commission (ERC) adjusts Ft every 4 months, causing bill fluctuations. Installing solar panels protects against this volatility since sunlight is a free energy source.

What is the average factory electricity bill in Thailand?

Factory electricity bills in Thailand vary by size and industry type. The average ranges from 150,000-500,000 THB/month for medium-sized factories. Shopping malls average 200,000-800,000 THB/month, office buildings 50,000-200,000 THB/month, and warehouses 30,000-100,000 THB/month. If your bill is above average, solar installation can significantly reduce costs.

How much can solar panels reduce my electricity bill?

Solar panels typically reduce electricity bills by 30-50%, depending on system size, available roof area, sunlight levels, and usage patterns. PPA (zero investment) models save approximately 10-30%, while EPC (self-investment) provides greater long-term savings. CapSolar will analyze your bill and design a system specifically suited to your business.

How to calculate factory electricity cost?

Factory electricity is calculated from 4 components: (1) Demand charge (peak kW x rate) (2) Energy charge (kWh x TOU on-peak/off-peak rate) (3) Ft variable surcharge (kWh x current Ft 0.1623 THB) (4) 7% VAT on the total. Combined, these form your monthly bill. Enter your numbers in the analyzer above to see your actual cost structure.

Electricity Bill Analyzer

Factory Electricity Bill Analysis Are You Overpaying?

Analyze your business electricity cost structure, compare with industry averages, and discover savings opportunities with solar energy
Just enter your monthly bill to instantly see if you're paying above average and how much more you could save Learn more about Thailand's electricity tariff structure.

Free — No CostAnalysis in 30 SecondsSuitable for Businesses of All Sizes

Analyze Your Electricity Bill

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Monthly Electricity Bill (THB) *

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Are you on TOU rate?

TOU (Time of Use) means electricity rates vary by time of day — higher during On-Peak and lower during Off-Peak hours. Check your electricity bill to confirm.

PPA Discount Rate (%)

20%

Percentage discount on electricity bill via PPA (TOU users get extra 5%)

Thai Factory Electricity 2026 -- Key Numbers

Thai factory electricity in 2026 averages 3.95 THB/kWh (Ft 0.1623 THB/kWh). Type 3-4 factories use TOU pricing: on-peak (09:00-22:00) at 5.27 THB/kWh and off-peak at 3.80 THB/kWh. Solar panels generate during on-peak hours, cutting the most expensive portion of your bill by 30-60%.