{"id":14223,"date":"2025-07-24T09:00:21","date_gmt":"2025-07-24T00:00:21","guid":{"rendered":"https:\/\/www.rts-pv.com\/en\/?post_type=blogs&p=14223"},"modified":"2025-07-04T09:37:04","modified_gmt":"2025-07-04T00:37:04","slug":"meti-proposes-new-zeh-definition-requiring-storage-batteries","status":"publish","type":"blogs","link":"https:\/\/www.rts-pv.com\/en\/blogs\/14223\/","title":{"rendered":"METI Proposes New ZEH Definition Requiring Storage Batteries"},"content":{"rendered":"
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Japan Solar Update: No.158 (Juy 21 ~ 25, 2025)\u00a0<\/h6>\n<\/div>\n
\"New<\/h6>\n<\/div>\n<\/div>\n

 <\/p>\n

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<Key points><\/span><\/span><\/span><\/strong><\/p>\n

    \n
  • The Ministry of Economy, Trade and Industry (METI) has proposed a revision to the definition of ZEH (Net Zero Energy Houses), requiring the installation of storage batteries in detached houses equipped with PV systems<\/li>\n
  • To encourage a higher PV installation rate per household, METI plans to introduce higher-grade categories such as the New ZEH+<\/li>\n
  • The new definition is scheduled to be applied to new certifications starting in FY 2027, and public comments are being solicited<\/li>\n<\/ul>\n<\/div>\n

     <\/p>\n

    \n

    Review of ZEH definition<\/span><\/p>\n<\/div>\n

    High energy efficiency performance, and promotion of PV power generation for self-consumption<\/span><\/div>\n
    <\/div>\n

     <\/p>\n

     <\/p>\n

    \n

    Concept of the review of definition<\/span><\/p>\n<\/div>\n

    \n
      \n
    • For detached houses, the installation of equipment that contributes to self-consumption<\/span> is required<\/li>\n
    • Higher-grade categories are to be introduced with the aim of promoting an increase in the PV installation ratio per household<\/span><\/li>\n<\/ul>\n<\/div>\n
      <\/div>\n

       <\/p>\n

       <\/p>\n

       <\/p>\n

       <\/p>\n

      Definition of New ZEH (draft)<\/strong><\/p>\n\n\n\n\n\n\n\n\n
      Detached houses<\/td>\nDetached houses<\/td>\nCollective housing<\/td>\n<\/tr>\n
      Energy-saving performance<\/p>\n<\/td>\nHeat insulation performance<\/td>\nHeat insulation grade: 6<\/td>\nHeat insulation grade: 6<\/td>\n<\/tr>\n
      Rate of reduction in primary energy consumption (only energy-saving included)<\/td>\n35%<\/td>\n35%<\/td>\n<\/tr>\n
      Requirements for equipment *1<\/td>\n\n

      1. High level energy management<\/p>\n

      2. Storage batteries<\/span><\/p>\n<\/td>\n

      		–<\/td>\n<\/tr>\n
      Regional characteristics and building characteristics *2 (Criteria for ZEH-Oriented, which does not require installation of renewable energy systems)<\/td>\n\n

      \u30fbSnowy region<\/p>\n

      \u30fbSmall land in urban areas<\/p>\n<\/td>\n

      		\n

      \u30fbSnowy region<\/p>\n

      \u30fb6th floor and above<\/p>\n<\/td>\n<\/tr>\n

      Requirements for renewable energy (Rate of reduction in primary energy consumption including renewable energy)<\/td>\n\n

      New ZEH+: 115%<\/span><\/p>\n

      New ZEH: 100%<\/p>\n

      Nearly New ZEH: 75%<\/p>\n<\/td>\n

      		\n

      New ZEH-M+: 115%<\/span><\/p>\n

      New ZEH-M: 100%<\/p>\n

      Nearly New ZEH-M: 75%<\/p>\n

      New ZEH-M Ready: 50%<\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

      *1: EV chargers\/dischargers are designated as recommended equipment, and architects are required to provide explanations of the necessary information when considering installation<\/p>\n

      *2: Renewable energy equipment is designated as a recommended measure, and architects are required to provide explanations of the necessary information when considering installation<\/p>\n

      *3: Applicable only when PV systems are installed<\/span><\/p>\n

       <\/p>\n

      \n

      Upcoming schedule (draft)<\/strong>: <\/span><\/span><\/span><\/p>\n<\/div>\n

       <\/p>\n

       <\/p>\n

      \u30fbThe new definition will be applied to new certifications starting in FY 2027.<\/span> Under the current definition, new certifications are scheduled to be discontinued, due in the end of FY 2027<\/p>\n

      \u30fbHowever, in cases where houses built by FY 2027 are renovated, certification under the current definition will still be allowed<\/p>\n

       <\/p>\n

      \n

      Public comments are now being solicited<\/span> on the proposed revision of the definitions for ZEH and ZEHM (for detached houses and collective housing)<\/span><\/span><\/p>\n<\/div>\n

       <\/p>\n

      Public comments are solicited between May 28 and June 27, 2025<\/p>\n

      Figure 1 Review of the definition of ZEH and upcoming schedule, etc.<\/span><\/p>\n

       <\/p>\n

      Source: Materials of the 48th meeting of the Energy Efficiency and Conservation Subcommittee (May 12, 2025), compiled by RTS Corporation <\/span><\/p>\n

       <\/p>\n","protected":false},"featured_media":14304,"template":"","blogs_category":[44],"class_list":["post-14223","blogs","type-blogs","status-publish","has-post-thumbnail","hentry","blogs_category-regulations-government-initiatives"],"acf":[],"yoast_head":"\nMETI Proposes New ZEH Definition Requiring Storage Batteries | RTS Corporation<\/title>\n<meta name=\"description\" content=\"Based upon over 40 years of our experiences and accumulated knowledge in PV,RTS Corporation has been providing in RTS Corporation is a leading PV industry \/ market consultingcompany and has been supporting the growth of the PV industry for nearly 40 years.We provide an optimal consulting service for each client interested in the PV business.\u3000Weekly PV news is available at RTS PV Blog.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.rts-pv.com\/en\/blogs\/14223\/\" \/>\n<meta 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