{ "metadata": { "title": "電力小売競争ベンチマーク", "generated_at": "2026-09-03T09:03:45.895459+00:00", "as_of": "2026-07-17", "source": "電力・ガス取引監視等委員会 電力取引報", "source_url": "https://www.egc.meti.go.jp/info/business/report/results.html", "definition": "新電力は、みなし小売電気事業者以外の小売電気事業者および特定送配電事業者。販売電力量・販売額はその他需要を除く。契約口数は低圧のみ。エリア・電圧別シェアは表1の全小売販売量に対する表2の新電力販売量。", "actuals_only": true }, "records": [ { "period": "2016-04", "sales_volume_share_pct": 5.2, "sales_volume_yoy_pt": null, "sales_amount_share_pct": null, "sales_amount_yoy_pt": null, "accounts_share_pct": null, "accounts_yoy_pt": null, "amount_volume_gap_pt": null, "published_at": "2016-07-28", "source_url": "https://www.egc.meti.go.jp/info/public/pdf/20160728001a.pdf", "historical_chart_only": true }, { "period": "2017-12", "sales_volume_share_pct": 12.7, "sales_volume_yoy_pt": null, "sales_amount_share_pct": null, "sales_amount_yoy_pt": null, "accounts_share_pct": null, "accounts_yoy_pt": null, "amount_volume_gap_pt": null, "published_at": "2018-03-15", "source_url": "https://www.egc.meti.go.jp/info/public/pdf/20180315001a.pdf", "historical_chart_only": true }, { "period": "2018-04", "sales_volume_share_pct": 12.7, "sales_volume_yoy_pt": null, "sales_amount_share_pct": null, "sales_amount_yoy_pt": null, "accounts_share_pct": null, "accounts_yoy_pt": null, "amount_volume_gap_pt": null, "published_at": "2018-07-18", "source_url": "https://www.egc.meti.go.jp/info/public/pdf/20180718001a.pdf", "historical_chart_only": true }, { "period": "2019-04", "sales_volume_share_pct": 14, "sales_volume_yoy_pt": null, "sales_amount_share_pct": null, "sales_amount_yoy_pt": null, "accounts_share_pct": null, "accounts_yoy_pt": null, "amount_volume_gap_pt": null, "published_at": "2019-07-15", "source_url": "https://www.egc.meti.go.jp/info/public/pdf/20190715001a.pdf", "historical_chart_only": true }, { "period": "2020-04", "sales_volume_share_pct": 16.2, "sales_volume_yoy_pt": null, "sales_amount_share_pct": null, "sales_amount_yoy_pt": null, "accounts_share_pct": null, "accounts_yoy_pt": null, "amount_volume_gap_pt": null, "published_at": "2020-07-28", "source_url": "https://www.egc.meti.go.jp/info/public/pdf/20200728001a.pdf", "historical_chart_only": true }, { "period": "2021-04", "sales_volume_share_pct": 19.9, "sales_volume_yoy_pt": null, "sales_amount_share_pct": null, "sales_amount_yoy_pt": null, "accounts_share_pct": null, "accounts_yoy_pt": null, "amount_volume_gap_pt": null, "published_at": "2021-07-15", "source_url": "https://www.egc.meti.go.jp/info/public/pdf/20210715001a.pdf", "historical_chart_only": true }, { "period": "2022-04", "sales_volume_share_pct": 19.9, "sales_volume_yoy_pt": null, "sales_amount_share_pct": null, "sales_amount_yoy_pt": null, "accounts_share_pct": null, "accounts_yoy_pt": null, "amount_volume_gap_pt": null, "published_at": "2022-08-02", "source_url": "https://www.egc.meti.go.jp/info/public/pdf/20220802001a.pdf", "historical_chart_only": true }, { "period": "2023-03", "sales_volume_share_pct": 17.7, "sales_volume_yoy_pt": null, "sales_amount_share_pct": null, "sales_amount_yoy_pt": null, "accounts_share_pct": null, "accounts_yoy_pt": null, "amount_volume_gap_pt": null, "published_at": "2023-06-19", "source_url": "https://www.egc.meti.go.jp/info/public/pdf/20230619001a.pdf", "historical_chart_only": true }, { "period": "2024-10", "sales_volume_share_pct": 19.2, "sales_volume_yoy_pt": null, "sales_amount_share_pct": null, "sales_amount_yoy_pt": null, "accounts_share_pct": null, "accounts_yoy_pt": null, "amount_volume_gap_pt": null, "published_at": "2025-01-24", "source_url": "https://www.egc.meti.go.jp/info/public/pdf/20250124001a.pdf", "historical_chart_only": true }, { "period": "2025-04", "sales_volume_share_pct": 20.3, "sales_volume_yoy_pt": null, "sales_amount_share_pct": null, "sales_amount_yoy_pt": null, "accounts_share_pct": null, "accounts_yoy_pt": null, "amount_volume_gap_pt": null, "published_at": "2025-07-17", "source_url": "https://www.egc.meti.go.jp/info/public/pdf/20250717001a.pdf", "historical_chart_only": true }, { "period": "2026-01", "sales_volume_share_pct": 22.3, "sales_amount_share_pct": 23.9, "accounts_share_pct": 24.3, "sales_volume_yoy_pt": 2.1, "sales_amount_yoy_pt": 1.3, "accounts_yoy_pt": 1.6, "published_at": "2026-04-15", "source_url": "https://www.egc.meti.go.jp/info/public/pdf/20260415002a.pdf", "amount_volume_gap_pt": 1.6 }, { "period": "2026-02", "sales_volume_share_pct": 22.5, "sales_amount_share_pct": 25.1, "accounts_share_pct": 24.4, "sales_volume_yoy_pt": 1.9, "sales_amount_yoy_pt": 1.7, "accounts_yoy_pt": 1.7, "published_at": "2026-05-20", "source_url": "https://www.egc.meti.go.jp/info/public/pdf/20260520001a.pdf", "amount_volume_gap_pt": 2.6 }, { "period": "2026-03", "sales_volume_share_pct": 21.9, "sales_amount_share_pct": 24.8, "accounts_share_pct": 24.7, "sales_volume_yoy_pt": 2.1, "sales_amount_yoy_pt": 2.5, "accounts_yoy_pt": null, "published_at": "2026-06-15", "source_url": "https://www.egc.meti.go.jp/info/public/pdf/20260615001a.pdf", "amount_volume_gap_pt": 2.9 }, { "period": "2026-04", "sales_volume_share_pct": 22.2, "sales_amount_share_pct": 25, "accounts_share_pct": 24.9, "sales_volume_yoy_pt": 1.9, "sales_amount_yoy_pt": 2.8, "accounts_yoy_pt": 1.7, "published_at": "2026-07-17", "source_url": "https://www.egc.meti.go.jp/info/public/pdf/20260717001a.pdf", "area_voltage": [ { "area": "北海道", "all_retail_thousand_kwh": { "special_high": 270838, "high": 901779, "low": 1046156, "low_lighting": 888619, "low_power": 157537, "total": 2218774, "other_demand": 4824 }, "new_retail_thousand_kwh": { "special_high": 29636, "high": 206323, "low": 240615, "low_lighting": 222085, "low_power": 18530, "total": 476575, "other_demand": 2797 }, "share_pct": { "special_high": 10.9, "high": 22.9, "low": 23, "low_lighting": 25, "low_power": 11.8, "total": 21.5 } }, { "area": "東北", "all_retail_thousand_kwh": { "special_high": 1481598, "high": 2153330, "low": 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