Japan plans to expand its energy efficiency reporting framework to include rooftop solar metrics from fiscal 2027, requiring designated large energy users to report total roof area and installed capacity after applying defined exclusions.
Japan’s Agency for Natural Resources and Energy (ANRE) will add rooftop solar reporting items to the Energy Conservation Act framework from fiscal 2027, requiring large-scale energy users to disclose roof area eligible for solar installation after exclusions, alongside area already equipped.
The new reporting items apply to designated energy users – companies, local governments, schools, hospitals, and other entities consuming more than 1,500 kiloliters of crude oil equivalent per year – who are already obligated to submit medium- and long-term energy plans and annual energy reports under the Energy Conservation Act.
Two changes take effect on a staggered schedule. From fiscal 2026, medium- and long-term plans must include qualitative statements on rooftop solar installation. From fiscal 2027, annual energy reports must include roof area eligible for installation after applying exclusion conditions, and the area already equipped. Roofs where installation is legally prohibited, where the operator lacks installation rights, or where the space is already in use – for example as evacuation areas – are excluded from the reported figures.
