Renewable energy use by major Japanese companies is advancing. In the 2025 edition of RE100, the average ratio rose to 51.6%, and the number of companies achieving 100% increased to 5. Challenges related to domestic procurement costs and measures to address them are also highlighted.
The average renewable energy ratio among Japanese companies as a whole rose to 51.6%, up from the previous year. The 2025 edition covered 88 Japanese companies. Of the 87 companies excluding 1 that did not report, 5 achieved 100%, including AESC Group, 旭化成ホームズ, ヒューリック, 第一生命保険 and 城南信用金庫. This brought the average close to the 59% average for participating companies worldwide.
Among the companies achieving 100%, AESC Group joined RE100 in 2024 and achieved 100% for the first time in the 2025 edition. 旭化成ホームズ, ヒューリック and 第一生命保険 have maintained 100% since 2024. Meanwhile, 7 companies were in the 90–99% range and are considered within reach of 100%: ダイビル, 東急不動産, 野村総合研究所, 大和ハウス工業, 浜松ホトニクス, ＩＣＨＩＧＯ and セイコーエプソン. Epson's ratio is high because it has a large number of manufacturing sites.
Examples of Japanese companies that significantly increased their ratios include 第一三共, whose ratio rose from 4% in 2024 to 80% in 2025, and アルプスアルパイン, which improved from 11% to 70%. インフロニア・ホールディングス rose 31 percentage points from the previous year to 89%, while 前田建設工業 and 前田道路 have already achieved 100%. ソニーグループ rose steadily to 40%, and ＴＤＫ to 53%.
Among overseas companies, Apple of the United States at 99.8%, Meta of the United States at 99.6% and BMW of Germany at 80% stand out, while companies in East Asia tend to have lower ratios. Although companies are expanding their use of renewable energy, rising prices for non-fossil certificates may make cost containment a challenge. Stable procurement through PPAs (power purchase agreements) is therefore cited as an effective measure. The report also notes that the pace of renewable energy adoption in Japan has slowed, with renewable energy accounting for only about 23% of power generation.