‘Approval’ of Tomari nuclear power plant: Early restart will support industry

Editorial

15:56 JST, May 1, 2025

A stable supply of inexpensive electricity is important not only for household finances but also from the perspective of industrial competitiveness. The restart of nuclear power plants that have been shut down in various locations should be expedited.

The Nuclear Regulation Authority has acknowledged that the No. 3 reactor of the Tomari nuclear power plant, which is operated by Hokkaido Electric Power Co., has effectively passed the NRA’s safety screening. The power company aims to restart the reactor in 2027, and it is expected to significantly improve the region’s power supply capacity.

The Tomari plant had supplied about 40% of the electricity consumed in Hokkaido, but it was shut down in May 2012 following the accident at Tokyo Electric Power Company Holdings, Inc.’s Fukushima No. 1 nuclear power plant. Currently, Hokkaido relies on thermal power generation for about 80% of its electricity, creating an unbalanced power structure.

Hokkaido Electric has reinforced its facilities, including with the use of emergency generators and pump trucks, in order to comply with new regulatory standards established after the accident. A 19-meter-high seawall is also under construction. It is hoped that every possible measure will be taken to ensure safety.

Hokkaido’s electricity demand was once expected to continue to fall due to the declining population and advances in energy-saving technologies. However, in recent years, there have been a series of plans to build semiconductor factories and data centers, and there are now concerns that there will be a power shortage.

Rapidus Corp., a domestic manufacturer of cutting-edge semiconductors, will begin mass production at its factory in Chitose, Hokkaido, in 2027. SoftBank Corp. will build a new data center in Tomakomai in the prefecture. Given these increases in demand, the restart of the Tomari plant, including the No. 1 and No. 2 reactors, which are currently undergoing safety screenings, is essential.

In July 2013, Hokkaido Electric applied for the safety screening to restart the Tomari plant shortly after it was shut down. However, the screening was prolonged due to uncertainty over the existence of active faults on the site, resulting in it taking nearly 12 years.

During that time, the 2018 Hokkaido earthquake, which hit the prefecture’s eastern Iburi region, caused a large thermal power plant to shut down, resulting in a power outage across the entire prefecture. Russia’s aggression against Ukraine has led to a global surge in prices of liquefied natural gas, which is used as fuel for thermal power generation.

Electricity rates tend to be cheaper in areas where nuclear power plants have already resumed operations, creating a disparity with areas where operations have not resumed. If the Tomari plant resumes operations, electricity rates are likely to decrease in the future.

Restarting nuclear power plants will reduce carbon dioxide emissions and help combat global warming. Furthermore, it will meet the security demands for securing energy needed domestically.

In the case of the Tomari plant, the screening process took a long time. While preventing serious accidents is obviously important, the disadvantages of keeping nuclear power plants shut down are also significant. Improving the efficiency of safety screenings and shortening the screening period are also important issues.

(From The Yomiuri Shimbun, May 1, 2025)