Industry-First Service to Make CO2 Emissions from Residential Homes Net-Zero: 'Sumirin Denki 0' Launches in April

Sumitomo Forestry Co., Ltd. (President: Toshiro Mitsuyoshi; Headquarters: Chiyoda-ku, Tokyo) will launch 'Sumirin Denki 0' in April for owners of 'Sumitomo Forestry Homes' and customers who have completed renovation work through its wholly-owned subsidiary, Sumitomo Forestry Home Tech Co., Ltd. This service makes the CO2 emissions from the electricity used by customers effectively zero, marking the first such initiative by a housing manufacturer for detached home owners (*1). The system works by adding non-fossil fuel certificates (renewable energy designated) (*2), which represent the environmental value derived from renewable energy, to the electricity supplied by retail electricity partners, thereby offsetting CO2 emissions generated during power production. By promoting ZEH (Net Zero Energy Houses) and expanding environmentally friendly power supply to homeowners, the company aims to achieve its SBT (*3) goal of net-zero greenhouse gas emissions across the entire Sumitomo Forestry Group value chain by 2050. ■ 'Sumirin Denki 0' Overview Target: Owners of 'Sumitomo Forestry Homes' and customers who have renovated with 'Sumitomo Forestry Home Tech'. Region: Nationwide (excluding Okinawa). Supply Start: April 1st. Application Start: February 5th: Tokyo, Kanagawa, Saitama, Chiba, Ibaraki, Tochigi, Gunma; March 10th: Osaka, Kyoto, Hyogo, Shiga, Nara, Wakayama; Late April: Other regions. Application Method: Via the application page on the owner-exclusive site 'clubforest'. Electricity Rates: Approximately 1% cheaper than the standard household plans of regional power companies (former general electricity utilities) (*4). Other: If selling surplus electricity after the FIT period, the power supply contract will be bundled. 1: Based on publicly available information confirmed by the company, this is the first initiative by a domestic housing manufacturer for detached home owners. The company acts on behalf of the electricity provider to solicit and process applications for this service. 2: Non-fossil value (environmental value) generated from electricity produced by 'non-fossil power sources' that do not use fossil fuels like coal or oil, which has been separated and certified for trading. 3: Science Based Targets (SBT) are greenhouse gas emission reduction targets based on scientific evidence to limit the rise in global average temperature to well below 2°C compared to pre-industrial levels. The SBTi (Science Based Targets initiative) was established in 2015 by the UN Global Compact, CDP, World Resources Institute (WRI), and World Wide Fund for Nature (WWF) to certify these targets. 4: Based on comparisons calculated by the company using publicly available information. ■ Background and Significance In 2019, the company began accepting applications for 'Sumirin Denki' to purchase surplus electricity from homeowners whose feed-in tariff (FIT) period for solar power had expired. Since 2021, the purchased electricity has been utilized at the Sumitomo Forestry Group's domestic housing business offices and showrooms. By combining the use of this 'Sumirin Denki' with the purchase of non-fossil certificates (*5), the share of renewable energy in the electricity used by the company's domestic housing business reached 100% in 2025. Furthermore, the amount of electricity purchased through 'Sumirin Denki' in 2025 reached 21.2 GWh, exceeding the total electricity consumption of the domestic housing business of 16.5 GWh (*6)...