Japan enters winter energy-saving period, public requested to layer up

Japan on Thursday entered a period of electricity saving amid a tough supply outlook for the winter, with the government asking households to layer up and switch off the lights. 

The energy-saving period is scheduled to last through March 2023 with the government asking households and businesses to cooperate with energy-saving measures to the extent that is reasonable, particularly during the daytime when energy demand is typically at its highest. 

It is the first time in seven years, since FY2015, for authorities to request power-saving efforts during the winter months.  

The reserve supply-demand ratio of three percent or more, the minimum needed for a stable energy supply, has been secured throughout Japan, according to the Ministry of Economy, Trade and Industry. However, concerns remain that a stable supply may not be possible in the event of large-scale power plant problems. International fuel prices also remain high due to Russia's invasion of Ukraine creating an unpredictable situation surrounding fuel supply, according to the ministry.

Although no numerical targets have been set for the energy-saving period, further cooperation may be required of households and businesses in the event of an emergency, say the ministry.

Heating accounts for the largest amount of electricity use among households in Japan (outside of Okinawa) during the winter season. Among households in Honshu, Kyushu and Shikoku heating accounts for 32.7 percent of electricity usage over winter. Aircon usage accounts for the largest portion of this at just over 17 percent, according to ministry data. 

The government has put together an energy-saving “menu” offering suggestions on how households can cut back on electricity use during the saving period.

Lowering room temperature from 22°C to 20°C when using air conditioning can reduce consumption by 2.7 percent, according to the menu. Turning off all unnecessary lights can account for a reduction of as much as 4.5 percent. Cleaning clogged air conditioner filters, hanging thick curtains, and avoiding overstocking of refrigerators are among other energy-saving suggestions from the government.

“As an example, we would like to ask people to wear layers of clothing, turn down the temperature a little, or turn off lights in rooms that are not in use,” Economy, Trade and Industry Minister Yasutoshi Nishimura told reporters Wednesday. 

Through an energy-saving program, the government is also encouraging households to participate in the energy-saving schemes offered by electric power companies, offering entrants points for taking part in the schemes and additional points each month if they reduce electricity usage by at least three percent compared to the previous year.

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