Taipei: Taiwan Power Co. (Taipower) will implement its annual summer electricity rates for residential users from June 1 through Sept. 30, with the average monthly bill expected to rise to NT$1,084 (US$34.52) during the season.
According to Focus Taiwan, the state-run utility's website announced that summer rates for approximately 15 million residential and small commercial users will commence on June 1. Meanwhile, the seasonal pricing scheme for around 26,000 high-voltage and extra high-voltage users will begin earlier, running from May 16 to Oct. 15.
Taipower detailed that the summer pricing mechanism has been in place since 1989, attributing higher rates from June through September to increased electricity demand, primarily due to air conditioning and other cooling systems. The average monthly household usage throughout the year is about 345 kilowatt-hours (kWh), as per data for 2025. During non-summer months, household electricity consumption in Taiwan averages 308 kWh per month, costing NT$638.
In the summer months, average monthly domestic usage rises to 418 kWh, pushing the bill up nearly 70 percent to NT$1,084. Taipower clarified that the higher costs to residential consumers during the summer are mainly due to increased electricity usage rather than the rate hike. Electricity usage accounts for 73 percent of the increase, while the higher seasonal rates contribute 27 percent.
Most households in Taiwan use the standard progressive pricing system, where electricity rates escalate based on consumption levels. Under the current six-tier pricing system for residential users, the first 120 kWh consumed during summer months is charged at NT$1.78 per kWh, the next 210 kWh at NT$2.55 per kWh, and the remaining 88 kWh at NT$3.80 per kWh. Taipower also offers time-of-use plans, which charge different rates for peak and off-peak hours. However, the standard progressive pricing system remains more cost-effective for most households with relatively low electricity consumption or usage concentrated during peak daytime hours.
Meanwhile, industrial consumers are generally subject to summer rate hikes from May 16 to Oct. 15 as a measure to encourage electricity conservation, according to Taipower.