Tokyo Electric Power Company Holdings, Incorporated

Tokyo Electric Power Company Holdings, Incorporated This is the offcial English page of Tokyo Electric Power Company Holdings, Incorporated.

Tokyo Electric Power Company Holdings, Incorporated is Japan's largest power company, supplying energy to the greater Kanto area, including Japan's two most populous cities, Tokyo and Yokohama. Its 35,000 employees are committed to providing safe, reliable power to its 28.8 million customers, diversifying energy resources to ensure sustainability, and contributing to economic growth while fully meeting its responsibilities after the Fukushima Daiichi accident.

[This way to Oze! Vol.75: Japanese iris blooming under the rainy-season sky]Although Oze typically receives relatively l...
14/07/2026

[This way to Oze! Vol.75: Japanese iris blooming under the rainy-season sky]

Although Oze typically receives relatively little rainfall due to its climate on the Sea of Japan side of the country, this year has brought the kind of persistent rain that is characteristic of Japan’s rainy season. On the last day of June, large colonies of Japanese irises stood out vividly across the Ozegahara marshland. Visitors to Ozegahara can observe two very similar iris species: Japanese iris and Arctic iris. The Japanese iris is distinguished by a single white stripe on each petal, creating a striking contrast between deep purple and white. In contrast, the petals of the Arctic iris feature a distinctive veined or net-like pattern. It is Japanese iris that forms extensive colonies across the marsh. The sight of its rich purple blossoms spreading over the lush green wetlands is one of the signature scenes of early summer in Oze, heralding the arrival of the season.

The rainy season can sometimes make hiking and photography less convenient, requiring visitors to wear rain gear or carry umbrellas. Yet it is during this season that one can enjoy a uniquely beautiful sight: wetland flowers adorned with glistening raindrops on their petals. The flowers blooming across the marshes amid the soft, rain-soaked scenery offer a charm all their own. These tranquil landscapes and moisture-laden blossoms are among the many attractions that make Oze such a special place to visit during the rainy season.

In addition to Nikko daylily and Bog asphodel that will soon begin blooming across Oze, several rare alpine and wetland plants will also come into flower. Among them are the delicate pink-flowered Japanese pogonia, a member of the orchid family, the striking Marsh orchid, known for its deep reddish-purple blossoms, and Persimmon orchid, whose name is derived from the resemblance of its flowers to persimmon fruits. These unique species add further color and diversity to Oze’s summer wetlands, offering visitors the chance to encounter some of Japan’s most distinctive native wildflowers.

For more information about Oze, visit the TEPCO Renewable Power website!
【Oze & TEPCO】　https://www.tepco.co.jp/rp/oze/

[This way to Oze! Vol.74: The Alpine Wildflower Bloom Relay Is About to Begin]Before the height of summer arrives, the m...
08/07/2026

[This way to Oze! Vol.74: The Alpine Wildflower Bloom Relay Is About to Begin]

Before the height of summer arrives, the marshlands of Oze are often blanketed in white by cottongrass. Many people look forward to this beautiful sight each year. Cottongrass is a plant known for its pronounced boom-and-bust flowering cycles, producing abundant blooms in some years and very few in others. This year, due to low snowfall and the effects of frost, cottongrass is not expected to be seen in large numbers.

In general, years with few cottongrass blooms tend to be favorable years for other species such as Bog rosemary and Tateyama gentian. This year, in place of cottongrass, vast expanses of pale bluish-purple Tateyama gentian flowers came into magnificent bloom across the marshlands. From late June through late July, a succession of seasonal highlights follows, including Japanese iris, Nikko daylily and Bog Asphodel. One of the great attractions of Oze in summer is the continuous relay of alpine wildflower blooms, allowing visitors to enjoy a changing tapestry of flowers throughout the season.

Oze has a climate similar to the Sea of Japan side of the country, with fine weather often prevailing at the start of the rainy season, followed by periods of heavy rainfall as the season progresses. Before visiting, we recommend checking the weather forecast for Uonuma City in Niigata Prefecture, whose climate closely resembles that of Oze. Why not plan a trip to Oze and enjoy the flowers that can be seen only during the rainy season?

For more information about Oze, visit TEPCO Renewable Power website!
【Oze & TEPCO】　https://www.tepco.co.jp/rp/oze/

[Communication Booth held in Niigata Prefecture]At the Kashiwazaki-Kariwa Nuclear Power Station, we have implemented a n...
25/06/2026

[Communication Booth held in Niigata Prefecture]
At the Kashiwazaki-Kariwa Nuclear Power Station, we have implemented a number of safety measures based on the lessons learned from the Fukushima Daiichi Nuclear Power Station accident.
On Saturday, June 20 and Sunday, June 21, 2026, we held a communication booth in Uonuma City, where Niigata Headquarters Representative Kakizawa had an opportunity to speak directly with visitors.
From those who visited, we received comments regarding the Kashiwazaki-Kariwa Nuclear Power Station such as, “In addition to the earthquake measures, I also received an explanation about measures for risks other than earthquakes, which left me with a more positive impression.”, “It was great to be able to see the inside of the power station through VR, something that can’t be understood from the outside.” and “I would like to take a bus tour of a power station and see an actual facility in person.”
Going forward, we will continue to sincerely address the questions and concerns received from people in Niigata Prefecture through our communication booths. We will also consistently provide clear and easy-to-understand explanations about Japan’s energy mix, the necessity of nuclear power, and safety measures at nuclear power stations.
On the day, Kakizawa also stopped by the nearby roadside station “Yunotani,” where he enjoyed salt- grilled sweetfish, and later savored the local specialty, Yairo shiitake mushrooms.

At the 23rd meeting of the Nuclear Reform Monitoring Committee (NRMC) held on June 23, the committee reviewed TEPCO’s on...
24/06/2026

At the 23rd meeting of the Nuclear Reform Monitoring Committee (NRMC) held on June 23, the committee reviewed TEPCO’s ongoing nuclear safety reform initiatives and the progress of decommissioning work at the Fukushima Daiichi Nuclear Power Station.
The NRMC provided evaluations and recommendations to TEPCO’s management, reflecting the insights gained from its continuous oversight activities. Following the meeting, Chairman Dr. Dale Klein stated, “We have confirmed progress in strengthening safety culture across all of TEPCO’s nuclear power stations. Steadily accumulating initiatives in safety awareness/technological capability/ability to engage in dialogue, and continuously improving them, will also contribute to building trust.” underscoring the importance of sustained commitment to safety and organizational improvement.
As we move forward, TEPCO will continue to engage sincerely with external perspectives and expert guidance while advancing nuclear reform with determination and transparency.
About the Nuclear Reform Monitoring Committee
The NRMC is composed of domestic and international experts, including Dr. Dale Klein, former chairman of the United States Nuclear Regulatory Commission. The NRMC rigorously monitors TEPCO’s reforms toward enhancing nuclear safety.

[This way to Oze! Vol.73: Mt. Shibutsu’s Climbing Season Opens on June 20]Due to lower snowfall this winter, Mt. Shibuts...
22/06/2026

[This way to Oze! Vol.73: Mt. Shibutsu’s Climbing Season Opens on June 20]

Due to lower snowfall this winter, Mt. Shibutsu is scheduled to open for the climbing season on June 20, earlier than last year. In preparation for the opening, TEPCO Renewable Power has been installing protective fencing for alpine plants along the section it manages, extending from Hatomachi Pass to the summit area and Takamagahara.

Mt. Shibutsu is known as one of Japan’s 100 Famous Mountains and one of the 100 Famous Flower Mountains, attracting many climbers every year during the climbing season. However, the impact of this led to deterioration of vegetation and the expansion of bare ground around the trails, becoming a serious issue. To address this, the eastern trail was closed for eight years starting in 1989, during which trail restoration and conservation measures, centered on vegetation recovery, were carried out.
Currently, the following measures are still being implemented:
- Establishment of a temporary climbing restriction period following the snowy season around Golden Week
- Designation of the eastern trail as “uphill-only” for climbers

In addition, Mt. Shibutsu is also known as a treasure trove of alpine plants with high academic value. This year, flowering has already begun in areas with good sunlight and early snowmelt, including species such as Japanese edelweiss, Japanese primrose, Arctic yellow-violet, Aleutian avens, and Narcissus-flowered anemone (as of June 11).

There is still some remaining snow in the flower meadows near the benches and on parts of the boardwalk between Oyamazawa-tashiro and Mt. Koshibutsu, and on the eastern trail just below the summit. Depending on future snowmelt conditions, the trails may become slippery, so carrying traction aids such as light crampons is recommended. To protect alpine vegetation, please stay on the designated trails marked by ropes, even in snow-covered areas.
During the rainy season, strong winds and fog are likely to occur, and rescue operations may become more difficult. Please take adequate safety precautions and enjoy climbing Mt. Shibutsu.

For more information about Oze, visit TEPCO Renewable Power website!
【Oze & TEPCO】　https://www.tepco.co.jp/rp/oze/

On June 20, the Second discharge of ALPS treated water into the sea in FY2026 was completed. Monitoring results have con...
22/06/2026

On June 20, the Second discharge of ALPS treated water into the sea in FY2026 was completed. Monitoring results have confirmed that the water was discharged safely as planned.
Going forward, we will remain vigilant to ensure the safe and stable discharge of ALPS treated water.

TEPCO is proud to announce a significant milestone in our journey to elevate customer experience.TEPCO Energy Partner, T...
11/06/2026

TEPCO is proud to announce a significant milestone in our journey to elevate customer experience.

TEPCO Energy Partner, TEPCO’s retail energy company, has been awarded the highest “Three-Star” rating in three categories—Quality Service, Customer Service, and Support Portal—by HDI-Japan, the official Japanese chapter of the Help Desk Institute, one of the world’s largest support services organizations. This achievement is particularly meaningful as it marks the first time in Japan’s electricity and gas industry that a single company has earned top ratings in all three categories simultaneously.

The feedback from HDI-Japan highlighted our respectful, empathetic, and knowledgeable customer interactions; smooth, responsive, and customer-paced phone support, and a well-structured, intuitive website that allows customers to easily find information and complete procedures.

We see this not as a finish line, but as validation that we are moving in the right direction. At TEPCO Energy Partner, we remain committed to building trust, safety, and peace of mind. By delivering customer-centric service across all touchpoints, we aim to continuously improve and exceed customer expectations.

A huge thank you to our teams who make this possible every day—and to our customers for their continued trust.

[This way to Oze! Vol.72: Reaching Out to the World—Ecological Survey on the Japanese Dormouse in the Forests of Tokura]...
10/06/2026

[This way to Oze! Vol.72: Reaching Out to the World—Ecological Survey on the Japanese Dormouse in the Forests of Tokura]
Are you familiar with the Japanese dormouse? The dormouse is said to belong to the same group as mice and squirrels, and it inhabits forest environments in Japan. It is extremely lightweight, weighing only about 10 to 22 grams, and is a nocturnal mammal that lives in trees, moving by leaping from branch to branch. It is designated as a Near Threatened species and is also recognized as a national natural monument. In addition, it is known as an indicator species that reflects the richness of forest ecosystems. (See our website for reference: https://www.tepco.co.jp/rp/oze/iku/life/animal/other/other12-j.html [Japanese only])

This dormouse also inhabits the forests of Oze-Tokura. In this region, Tokyo Power Technology, a company within the TEPCO Group responsible for conservation activities in Oze, carries out thinning operations of Japanese larch trees to secure materials for boardwalks. To examine the impact of this work on the forest, the company has been studying the habitat of the Japanese dormouse—an animal cherished by forestry workers as a “guardian spirit of the mountains”—since 2018. The results have confirmed that the thinning has no significant impact. (See “This way to Oze! Vol. 10” for reference: https://www.tepco.co.jp/rp/oze/mamoru/column/column38-j.html [Japanese only])

In addition, Tokyo Power Technology offers hands-on dormouse survey programs as part of forest environmental education and continues ecological survey on the species in collaboration with the Science Club of Gunma Prefectural Oze High School. The Science Club presented their study, titled “Considering Wildlife-Friendly Forest Management through Dormouse Research,” at the “Tsukuba Science Edge (https://www.jtbbwt.com/files/user/ScienceEdge/en/index.html)” held in March 2026. Among 470 projects gathered from across the country, their work received a prize. As a supplementary prize, they earned recommendations and invitations to present at “Global Link Singapore” and “Global Link Australia,” both scheduled for this summer. Going forward, they will present their research on the dormouse - conducted in the forests of Oze—on international stages in Singapore and Australia.

Reiya Kobayashi, a third-year student in the Natural Environment Course at Oze High School, said, “I am very happy to receive such a wonderful award for this long-term research that has been passed down from my seniors. I was very nervous during the presentation, but I was able to share the appeal of the dormouse with many people and felt a great sense of accomplishment. At the international competitions this summer, I would like to do my best to tell people around the world about the dormouse.”

TEPCO Renewable Power will continue to support the exploration and learning of the younger generation who will lead the future of Oze, through forest environmental education and nature experience activities centered on Oze National Park.

For more information about Oze, visit TEPCO Renewable Power website!
【Oze & TEPCO】　https://www.tepco.co.jp/rp/oze/

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