{
  "timeline": [
    {
      "date": "1952/9",
      "category": "会社設立",
      "region": "",
      "importance": 5,
      "event": "電源開発促進法に基づき政府出資の株式会社として設立",
      "detail": "電源開発促進法（昭和27年7月31日法律第283号）に基づき設立",
      "significance": "政府主導の電源開発会社として発足。戦後復興期の電力不足解消を担う国策企業の誕生",
      "source": "有価証券報告書"
    },
    {
      "date": "1953/3",
      "category": "会社設立",
      "region": "",
      "importance": 1,
      "event": "共益㈱（現㈱J-POWERビジネスサービス）を設立",
      "detail": "連結子会社",
      "significance": "",
      "source": "有価証券報告書"
    },
    {
      "date": "1956/4",
      "category": "設備投資",
      "region": "",
      "importance": 5,
      "event": "佐久間発電所（出力35万kW）の運転を開始",
      "detail": "当社初の大規模水力発電所",
      "significance": "日本最大規模の水力発電所として完成。戦後の電力供給基盤を確立した象徴的プロジェクト",
      "source": "有価証券報告書",
      "amount": "出力35万kW"
    },
    {
      "date": "1960/3",
      "category": "会社設立",
      "region": "",
      "importance": 1,
      "event": "開発工事㈱（現㈱J-POWERハイテック）を設立",
      "detail": "連結子会社",
      "significance": "",
      "source": "有価証券報告書"
    },
    {
      "date": "1965/10",
      "category": "設備投資",
      "region": "",
      "importance": 2,
      "event": "佐久間周波数変換所の運転を開始",
      "detail": "周波数の異なる東西日本を繋ぐ変換設備",
      "significance": "東西日本の電力融通を可能にした基幹インフラ。周波数変換事業の礎",
      "source": "有価証券報告書"
    },
    {
      "date": "1967/6",
      "category": "会社設立",
      "region": "",
      "importance": 1,
      "event": "開発電気㈱（現J-POWERジェネレーションサービス㈱）を設立",
      "detail": "連結子会社",
      "significance": "",
      "source": "有価証券報告書"
    },
    {
      "date": "1972/11",
      "category": "設備投資",
      "region": "",
      "importance": 2,
      "event": "新豊根発電所（出力112.5万kW）の運転を開始",
      "detail": "当社初の出力100万kWを超える大規模揚水発電所",
      "significance": "大規模揚水発電の技術確立。電力系統安定化機能を担う揚水発電の先駆け",
      "source": "有価証券報告書",
      "amount": "出力112.5万kW"
    },
    {
      "date": "1974/4",
      "category": "会社設立",
      "region": "",
      "importance": 1,
      "event": "開発電子技術㈱（現J-POWERテレコミュニケーションサービス㈱）を設立",
      "detail": "連結子会社",
      "significance": "",
      "source": "有価証券報告書"
    },
    {
      "date": "1978/10",
      "category": "会社設立",
      "region": "",
      "importance": 1,
      "event": "㈱開発土木コンサルタント（現㈱J-POWER設計コンサルタント）を設立",
      "detail": "連結子会社",
      "significance": "",
      "source": "有価証券報告書"
    },
    {
      "date": "1981/11",
      "category": "会社設立|海外進出",
      "region": "その他",
      "importance": 1,
      "event": "EPDC (Australia) Pty. Ltd.（現J-POWER AUSTRALIA PTY. LTD.）を設立",
      "detail": "連結子会社",
      "significance": "海外事業展開の初期拠点",
      "source": "有価証券報告書"
    },
    {
      "date": "1984/7",
      "category": "会社設立",
      "region": "",
      "importance": 1,
      "event": "開発肥料㈱（連結子会社）を設立",
      "detail": "",
      "significance": "有価証券報告書",
      "source": ""
    },
    {
      "date": "2002/11",
      "category": "会社設立|海外進出",
      "region": "欧州",
      "importance": 1,
      "event": "J-Power Investment Netherlands B.V.（連結子会社）を設立",
      "detail": "",
      "significance": "有価証券報告書",
      "source": ""
    },
    {
      "date": "2003/11",
      "category": "株主対応",
      "region": "",
      "importance": 3,
      "event": "J-POWER民営化ファンド㈱が政府保有株式を取得し親会社となる",
      "detail": "政府出資の当社株式譲受により民営化プロセスが本格始動",
      "significance": "国策電力会社としての歴史に幕。民営化を通じた資本構造の転換",
      "source": "有価証券報告書"
    },
    {
      "date": "2004/2",
      "category": "会社設立|新規事業",
      "region": "",
      "importance": 1,
      "event": "㈱グリーンパワー瀬棚（現㈱ジェイウインド）を設立",
      "detail": "連結子会社",
      "significance": "",
      "source": "有価証券報告書"
    },
    {
      "date": "2004/4",
      "category": "組織再編",
      "region": "",
      "importance": 2,
      "event": "主要子会社を3社に集約再編",
      "detail": "㈱JPビジネスサービス・㈱JPハイテック・㈱ジェイペックへ集約",
      "significance": "グループ経営効率化に向けた子会社体制の整理",
      "source": "有価証券報告書"
    },
    {
      "date": "2004/10",
      "category": "株式上場",
      "region": "",
      "importance": 4,
      "event": "当社株式を東京証券取引所市場第一部に上場",
      "detail": "民営化完了の象徴",
      "significance": "完全民営化の達成。資本市場への参入により独立した事業体としての地位を確立",
      "source": "有価証券報告書"
    },
    {
      "date": "2004/10",
      "category": "株主対応",
      "region": "",
      "importance": 2,
      "event": "J-POWER民営化ファンド㈱が保有全株式を売却し親会社に該当しないこととなる",
      "detail": "上場に際し全株売却",
      "significance": "",
      "source": "有価証券報告書"
    },
    {
      "date": "2005/1",
      "category": "会社設立|海外進出",
      "region": "米州",
      "importance": 1,
      "event": "J-POWER North America Holdings Co.",
      "detail": " Ltd.（連結子会社）を設立",
      "significance": "",
      "source": "有価証券報告書"
    },
    {
      "date": "2005/3",
      "category": "会社設立",
      "region": "",
      "importance": 1,
      "event": "ジェイパワー・エンテック㈱（連結子会社）を設立",
      "detail": "",
      "significance": "有価証券報告書",
      "source": ""
    },
    {
      "date": "2005/5",
      "category": "会社設立",
      "region": "",
      "importance": 1,
      "event": "JM活性コークス㈱（連結子会社）を設立",
      "detail": "",
      "significance": "有価証券報告書",
      "source": ""
    },
    {
      "date": "2006/9",
      "category": "会社設立|海外進出",
      "region": "東南アジア",
      "importance": 1,
      "event": "J-POWER Holdings (Thailand) Co.",
      "detail": " Ltd.（連結子会社）を設立",
      "significance": "",
      "source": "有価証券報告書"
    },
    {
      "date": "2007/7",
      "category": "合弁設立|海外進出",
      "region": "東南アジア",
      "importance": 1,
      "event": "Gulf JP Co., Ltd.（連結子会社）を設立",
      "detail": "タイにおける電力事業の合弁",
      "significance": "",
      "source": "有価証券報告書"
    },
    {
      "date": "2007/10",
      "category": "合弁設立|海外進出",
      "region": "東南アジア",
      "importance": 1,
      "event": "Gulf JP NS Co., Ltd.および Gulf JP UT Co., Ltd.（連結子会社）を設立",
      "detail": "タイ電力事業の事業会社",
      "significance": "",
      "source": "有価証券報告書"
    },
    {
      "date": "2008/2",
      "category": "会社設立|海外進出",
      "region": "中国",
      "importance": 1,
      "event": "捷帕瓦電源開発諮詢（北京）有限公司（連結子会社）を設立",
      "detail": "",
      "significance": "有価証券報告書",
      "source": ""
    },
    {
      "date": "2009/12",
      "category": "会社設立|新規事業",
      "region": "",
      "importance": 1,
      "event": "宮崎ウッドペレット㈱（連結子会社）を設立",
      "detail": "バイオマス燃料事業",
      "significance": "",
      "source": "有価証券報告書"
    },
    {
      "date": "2011/4",
      "category": "会社設立|新規事業",
      "region": "",
      "importance": 1,
      "event": "㈱バイオコール大阪平野（連結子会社）を設立",
      "detail": "バイオマスコール事業",
      "significance": "",
      "source": "有価証券報告書"
    },
    {
      "date": "2012/10",
      "category": "会社設立|新規事業",
      "region": "",
      "importance": 1,
      "event": "㈱グリーンコール西海および㈱ジェイウインドせたな（連結子会社）を設立",
      "detail": "バイオマス・風力事業の子会社化",
      "significance": "",
      "source": "有価証券報告書"
    },
    {
      "date": "2015/11",
      "category": "会社設立|新規事業",
      "region": "",
      "importance": 1,
      "event": "㈱ジェイウインドくずまき（連結子会社）を設立",
      "detail": "風力発電事業",
      "significance": "",
      "source": "有価証券報告書"
    },
    {
      "date": "2017/4",
      "category": "会社設立|海外進出",
      "region": "米州",
      "importance": 1,
      "event": "Jackson Generation LLC および J-POWER Jackson Partners LLC（連結子会社）を設立",
      "detail": "米国における発電事業",
      "significance": "",
      "source": "有価証券報告書"
    },
    {
      "date": "2018/4",
      "category": "会社設立|新規事業",
      "region": "",
      "importance": 1,
      "event": "㈱ジェイウインド上ノ国（連結子会社）を設立",
      "detail": "風力発電事業",
      "significance": "",
      "source": "有価証券報告書"
    },
    {
      "date": "2018/6",
      "category": "会社設立|海外進出",
      "region": "その他",
      "importance": 1,
      "event": "J-Power Latrobe Valley Pty. Ltd.（連結子会社）を設立",
      "detail": "オーストラリアにおける発電事業",
      "significance": "",
      "source": "有価証券報告書"
    },
    {
      "date": "2018/7",
      "category": "会社設立|海外進出",
      "region": "欧州",
      "importance": 1,
      "event": "JP Renewable Europe Co., Ltd.（連結子会社）を設立",
      "detail": "欧州再生可能エネルギー事業",
      "significance": "",
      "source": "有価証券報告書"
    },
    {
      "date": "2019/4",
      "category": "組織再編",
      "region": "",
      "importance": 2,
      "event": "電源開発送変電ネットワーク㈱（送電事業分割準備会社）を設立",
      "detail": "発送電分離に対応した送電事業会社化の準備",
      "significance": "電力システム改革における発送電分離への対応。送電事業の独立化",
      "source": "有価証券報告書"
    },
    {
      "date": "2019/5",
      "category": "会社設立|海外進出",
      "region": "米州",
      "importance": 1,
      "event": "J-POWER Jackson Capital LLC（連結子会社）を設立",
      "detail": "米国発電事業の資本管理会社",
      "significance": "",
      "source": "有価証券報告書"
    },
    {
      "date": "2020/8",
      "category": "会社設立|海外進出",
      "region": "その他",
      "importance": 1,
      "event": "JP Generation Australia Pty. Ltd.および JPGA Partners Pty. Ltd.（連結子会社）を設立",
      "detail": "オーストラリア発電事業の持株・パートナー会社",
      "significance": "",
      "source": "有価証券報告書"
    },
    {
      "date": "2022/4",
      "category": "株式上場",
      "region": "",
      "importance": 1,
      "event": "東京証券取引所プライム市場へ移行",
      "detail": "市場区分見直しにより市場第一部から移行",
      "significance": "",
      "source": "有価証券報告書"
    },
    {
      "date": "2023/2",
      "category": "会社設立|海外進出",
      "region": "東南アジア",
      "importance": 1,
      "event": "J-Power Generation Philippines Inc.および J-POWER VIETNAM Co., Ltd.（連結子会社）を設立",
      "detail": "フィリピン・ベトナムにおける電力事業",
      "significance": "",
      "source": "有価証券報告書"
    },
    {
      "date": "2023/8",
      "category": "会社設立|新規事業",
      "region": "",
      "importance": 1,
      "event": "㈱ジェイソーラー（連結子会社）を設立",
      "detail": "太陽光発電事業",
      "significance": "",
      "source": "有価証券報告書"
    },
    {
      "date": "2024/7",
      "category": "企業買収|海外進出",
      "region": "その他",
      "importance": 2,
      "event": "GENEX POWER LTD.他を買収",
      "detail": "オーストラリアの再生可能エネルギー事業者を子会社化",
      "significance": "オーストラリアにおける再エネ事業の本格拡大。GENEX社の水力・太陽光・蓄電池資産を獲得",
      "source": "有価証券報告書"
    },
    {
      "date": "2024/10",
      "category": "会社設立|海外進出",
      "region": "東南アジア",
      "importance": 1,
      "event": "㈱アイル・インドネシア（連結子会社）を設立",
      "detail": "インドネシアにおける電力事業",
      "significance": "",
      "source": "有価証券報告書"
    },
    {
      "date": "2025/1",
      "category": "会社設立|海外進出",
      "region": "東南アジア",
      "importance": 1,
      "event": "PT JPOWER GENERATION INDONESIA（連結子会社）を設立",
      "detail": "インドネシアにおける発電事業会社",
      "significance": "",
      "source": "有価証券報告書"
    }
  ]
}