{
  "metadata": {
    "schema_version": 2,
    "generated_at": "2026-09-02T21:44:59+09:00",
    "area_key": "tokyo",
    "area_name": "東京",
    "period_from": "2025-09-01",
    "period_to": "2026-09-01",
    "interval_minutes": 30,
    "power_unit": "MW",
    "price_unit": "円/kWh",
    "price_tax": "税抜",
    "published_values_only": true,
    "contains_site_forecast": false,
    "plan_vintage_note": "翌々日計画と翌日・当日の最新公表計画を比較します。過去日の最新値はGC時点です。需要・供給力は実績値ではありません。",
    "calculated_fields": {
      "demand_plan_revision_mw": "latest_area_demand_mw - two_day_ahead_area_demand_mw",
      "supply_capacity_revision_mw": "latest_area_supply_capacity_mw - two_day_ahead_area_supply_capacity_mw",
      "latest_area_reserve_rate_pct": "latest_area_reserve_mw / latest_area_demand_mw * 100",
      "wide_reserve_rate_revision_pct_point": "latest_wide_reserve_rate_pct - two_day_ahead_wide_reserve_rate_pct"
    },
    "reuse_note": "インバランス料金は一般利用者向けWebAPIの公表値です。明示的なオープンライセンスではないため、出典・利用規約を保持しています。",
    "sources": [
      {
        "name": "電力広域的運営推進機関 広域予備率Web公表システム",
        "url": "https://web-kohyo.occto.or.jp/kks-web-public/download"
      },
      {
        "name": "一般送配電事業者 インバランス料金情報公表ウェブサイト",
        "url": "https://www.imbalanceprices-cs.jp/",
        "terms_url": "https://www.imbalanceprices-cs.jp/show/footer/terms_of_use.pdf"
      }
    ]
  },
  "latest": {
    "delivery_date": "2026-09-01",
    "peak_latest_area_demand_mw": 40152.0,
    "max_abs_demand_plan_revision_mw": 5516.0,
    "min_latest_wide_reserve_rate_pct": 13.54,
    "max_imbalance_shortage_jpy_kwh": 26.75,
    "min_imbalance_surplus_jpy_kwh": 7.12
  },
  "records": [
    {
      "delivery_date": "2025-09-01",
      "time_code": 1,
      "time_from": "00:00",
      "time_to": "00:30",
      "two_day_ahead_area_demand_mw": 31056.0,
      "latest_area_demand_mw": 31356.0,
      "demand_plan_revision_mw": 300.0,
      "two_day_ahead_area_supply_capacity_mw": 34826.0,
      "latest_area_supply_capacity_mw": 34970.0,
      "supply_capacity_revision_mw": 144.0,
      "latest_area_reserve_mw": 3614.0,
      "latest_area_reserve_rate_pct": 11.526,
      "two_day_ahead_wide_reserve_rate_pct": 14.07,
      "latest_wide_reserve_rate_pct": 11.94,
      "wide_reserve_rate_revision_pct_point": -2.13,
      "imbalance_surplus_jpy_kwh": 8.91,
      "imbalance_shortage_jpy_kwh": 8.91,
      "imbalance_surplus_revision": "0",
      "imbalance_shortage_revision": "0",
      "two_day_ahead_source_updated_at": "2025-09-27T17:49:00+09:00",
      "latest_plan_source_updated_at": "2025-09-29T22:59:00+09:00",
      "imbalance_source_updated_at": "2025-10-21T14:51:19+09:00"
    },
    {
      "delivery_date": "2025-09-01",
      "time_code": 2,
      "time_from": "00:30",
      "time_to": "01:00",
      "two_day_ahead_area_demand_mw": 29736.0,
      "latest_area_demand_mw": 29930.0,
      "demand_plan_revision_mw": 194.0,
      "two_day_ahead_area_supply_capacity_mw": 33996.0,
      "latest_area_supply_capacity_mw": 34444.0,
      "supply_capacity_revision_mw": 448.0,
      "latest_area_reserve_mw": 4514.0,
      "latest_area_reserve_rate_pct": 15.082,
      "two_day_ahead_wide_reserve_rate_pct": 16.39,
      "latest_wide_reserve_rate_pct": 13.9,
      "wide_reserve_rate_revision_pct_point": -2.49,
      "imbalance_surplus_jpy_kwh": 10.49,
      "imbalance_shortage_jpy_kwh": 10.49,
      "imbalance_surplus_revision": "0",
      "imbalance_shortage_revision": "0",
      "two_day_ahead_source_updated_at": "2025-09-27T17:49:00+09:00",
      "latest_plan_source_updated_at": "2025-09-29T22:59:00+09:00",
      "imbalance_source_updated_at": "2025-10-21T14:51:19+09:00"
    },
    {
      "delivery_date": "2025-09-01",
      "time_code": 3,
      "time_from": "01:00",
      "time_to": "01:30",
      "two_day_ahead_area_demand_mw": 28804.0,
      "latest_area_demand_mw": 29012.0,
      "demand_plan_revision_mw": 208.0,
      "two_day_ahead_area_supply_capacity_mw": 33850.0,
      "latest_area_supply_capacity_mw": 33570.0,
      "supply_capacity_revision_mw": -280.0,
      "latest_area_reserve_mw": 4558.0,
      "latest_area_reserve_rate_pct": 15.711,
      "two_day_ahead_wide_reserve_rate_pct": 17.73,
      "latest_wide_reserve_rate_pct": 15.72,
      "wide_reserve_rate_revision_pct_point": -2.01,
      "imbalance_surplus_jpy_kwh": 11.97,
      "imbalance_shortage_jpy_kwh": 11.97,
      "imbalance_surplus_revision": "0",
      "imbalance_shortage_revision": "0",
      "two_day_ahead_source_updated_at": "2025-09-27T17:49:00+09:00",
      "latest_plan_source_updated_at": "2025-09-29T22:59:00+09:00",
      "imbalance_source_updated_at": "2025-10-21T14:51:19+09:00"
    },
    {
      "delivery_date": "2025-09-01",
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      "time_from": "01:30",
      "time_to": "02:00",
      "two_day_ahead_area_demand_mw": 28080.0,
      "latest_area_demand_mw": 28250.0,
      "demand_plan_revision_mw": 170.0,
      "two_day_ahead_area_supply_capacity_mw": 33768.0,
      "latest_area_supply_capacity_mw": 33616.0,
      "supply_capacity_revision_mw": -152.0,
      "latest_area_reserve_mw": 5366.0,
      "latest_area_reserve_rate_pct": 18.995,
      "two_day_ahead_wide_reserve_rate_pct": 20.1,
      "latest_wide_reserve_rate_pct": 18.71,
      "wide_reserve_rate_revision_pct_point": -1.39,
      "imbalance_surplus_jpy_kwh": 12.26,
      "imbalance_shortage_jpy_kwh": 12.26,
      "imbalance_surplus_revision": "0",
      "imbalance_shortage_revision": "0",
      "two_day_ahead_source_updated_at": "2025-09-27T17:49:00+09:00",
      "latest_plan_source_updated_at": "2025-09-29T22:59:00+09:00",
      "imbalance_source_updated_at": "2025-10-21T14:51:19+09:00"
    },
    {
      "delivery_date": "2025-09-01",
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      "two_day_ahead_area_demand_mw": 27526.0,
      "latest_area_demand_mw": 27734.0,
      "demand_plan_revision_mw": 208.0,
      "two_day_ahead_area_supply_capacity_mw": 33264.0,
      "latest_area_supply_capacity_mw": 33814.0,
      "supply_capacity_revision_mw": 550.0,
      "latest_area_reserve_mw": 6080.0,
      "latest_area_reserve_rate_pct": 21.923,
      "two_day_ahead_wide_reserve_rate_pct": 21.33,
      "latest_wide_reserve_rate_pct": 19.16,
      "wide_reserve_rate_revision_pct_point": -2.17,
      "imbalance_surplus_jpy_kwh": 12.11,
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      "imbalance_shortage_revision": "0",
      "two_day_ahead_source_updated_at": "2025-09-27T17:49:00+09:00",
      "latest_plan_source_updated_at": "2025-09-29T22:59:00+09:00",
      "imbalance_source_updated_at": "2025-10-21T14:51:19+09:00"
    },
    {
      "delivery_date": "2025-09-01",
      "time_code": 6,
      "time_from": "02:30",
      "time_to": "03:00",
      "two_day_ahead_area_demand_mw": 27230.0,
      "latest_area_demand_mw": 27544.0,
      "demand_plan_revision_mw": 314.0,
      "two_day_ahead_area_supply_capacity_mw": 33080.0,
      "latest_area_supply_capacity_mw": 33384.0,
      "supply_capacity_revision_mw": 304.0,
      "latest_area_reserve_mw": 5840.0,
      "latest_area_reserve_rate_pct": 21.202,
      "two_day_ahead_wide_reserve_rate_pct": 22.04,
      "latest_wide_reserve_rate_pct": 19.54,
      "wide_reserve_rate_revision_pct_point": -2.5,
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    {
      "delivery_date": "2025-09-01",
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    {
      "delivery_date": "2025-09-01",
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      "latest_area_demand_mw": 27342.0,
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      "delivery_date": "2025-09-01",
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      "two_day_ahead_source_updated_at": "2025-09-27T17:49:00+09:00",
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    },
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      "two_day_ahead_source_updated_at": "2025-09-27T17:49:00+09:00",
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    },
    {
      "delivery_date": "2025-09-01",
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      "time_from": "06:00",
      "time_to": "06:30",
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      "demand_plan_revision_mw": 332.0,
      "two_day_ahead_area_supply_capacity_mw": 35150.0,
      "latest_area_supply_capacity_mw": 35256.0,
      "supply_capacity_revision_mw": 106.0,
      "latest_area_reserve_mw": 4688.0,
      "latest_area_reserve_rate_pct": 15.336,
      "two_day_ahead_wide_reserve_rate_pct": 16.77,
      "latest_wide_reserve_rate_pct": 14.11,
      "wide_reserve_rate_revision_pct_point": -2.66,
      "imbalance_surplus_jpy_kwh": 13.13,
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      "imbalance_surplus_revision": "0",
      "imbalance_shortage_revision": "0",
      "two_day_ahead_source_updated_at": "2025-09-27T17:49:00+09:00",
      "latest_plan_source_updated_at": "2025-09-29T22:59:00+09:00",
      "imbalance_source_updated_at": "2025-10-21T14:51:19+09:00"
    },
    {
      "delivery_date": "2025-09-01",
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      "time_from": "06:30",
      "time_to": "07:00",
      "two_day_ahead_area_demand_mw": 32376.0,
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      "two_day_ahead_area_supply_capacity_mw": 37032.0,
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      "latest_area_reserve_rate_pct": 13.214,
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      "latest_wide_reserve_rate_pct": 13.34,
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      "two_day_ahead_source_updated_at": "2025-09-27T17:49:00+09:00",
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    {
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      "latest_area_reserve_rate_pct": 10.691,
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      "latest_wide_reserve_rate_pct": 10.89,
      "wide_reserve_rate_revision_pct_point": -3.04,
      "imbalance_surplus_jpy_kwh": 10.32,
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      "two_day_ahead_source_updated_at": "2025-09-27T17:49:00+09:00",
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      "two_day_ahead_area_supply_capacity_mw": 43292.0,
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      "supply_capacity_revision_mw": -294.0,
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      "latest_area_reserve_rate_pct": 9.941,
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      "wide_reserve_rate_revision_pct_point": -2.92,
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        36.19,
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        35.08,
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      [
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        37.185,
        40.801,
        43.751,
        45.698,
        49.663
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    ],
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        17.73,
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        22.04,
        22.04,
        22.24,
        21.8,
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        13.93,
        13.03,
        13.24,
        10.89,
        8.13,
        7.86,
        7.77,
        7.97,
        8.28,
        8.47,
        7.89,
        7.99,
        7.73,
        7.63,
        7.64,
        7.58,
        7.31,
        6.06,
        4.6,
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        4.81,
        4.92,
        5.7,
        6.17,
        6.83,
        7.41,
        7.45,
        7.66,
        7.55,
        7.71,
        8.02,
        8.69,
        12.04,
        13.36
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      [
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        17.11,
        18.67,
        21.89,
        23.16,
        24.09,
        24.46,
        23.76,
        23.98,
        22.97,
        20.85,
        20.47,
        18.06,
        17.33,
        15.79,
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        13.84,
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        8.9,
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        8.32,
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        8.67,
        8.19,
        7.92,
        7.85,
        7.85,
        7.85,
        7.79,
        7.63,
        6.36,
        5.36,
        7.04,
        6.84,
        6.65,
        7.14,
        7.51,
        7.95,
        8.13,
        8.15,
        8.15,
        8.58,
        8.68,
        9.16,
        9.69,
        12.84
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      [
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        18.56,
        18.27,
        18.76,
        19.87,
        20.15,
        21.35,
        21.82,
        22.05,
        21.04,
        19.67,
        19.92,
        17.2,
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        16.55,
        15.97,
        14.45,
        12.03,
        11.71,
        11.78,
        11.76,
        11.45,
        11.33,
        11.54,
        11.59,
        11.56,
        10.7,
        10.78,
        10.21,
        9.24,
        8.83,
        6.95,
        6.51,
        6.23,
        8.8,
        8.97,
        8.87,
        9.86,
        10.05,
        10.81,
        11.05,
        11.03,
        11.22,
        11.48,
        11.59,
        12.68,
        13.8,
        15.87
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      [
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        17.68,
        18.04,
        20.01,
        21.83,
        23.45,
        24.12,
        24.93,
        25.11,
        24.36,
        22.58,
        22.65,
        19.13,
        17.98,
        15.79,
        13.78,
        11.85,
        10.61,
        10.32,
        10.06,
        9.77,
        9.27,
        9.29,
        9.24,
        9.28,
        9.27,
        9.48,
        9.59,
        9.26,
        9.2,
        9.12,
        8.86,
        8.58,
        8.14,
        8.11,
        8.11,
        8.13,
        8.57,
        9.0,
        9.67,
        9.64,
        10.02,
        10.75,
        11.53,
        11.77,
        12.3,
        11.93,
        14.89
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      [
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        17.15,
        16.58,
        17.49,
        18.75,
        19.17,
        19.17,
        19.3,
        19.26,
        18.37,
        16.91,
        16.26,
        14.87,
        12.79,
        11.8,
        11.35,
        10.17,
        10.12,
        9.83,
        9.93,
        9.84,
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