{
  "meta": {
    "utility": "ComEd",
    "rate_class": "Residential Non-Space Heat",
    "unit": "cents per kWh",
    "definition": "Price to Compare = electric supply charge + transmission services charge. Excludes the Purchased Electricity Adjustment (PEA), listed separately. Supply half of the bill only; delivery charges are not included.",
    "generated_by": "tools/seo/build_comed_ptc_history.py",
    "doi": "10.5281/zenodo.21969015",
    "sources": {
      "icc_historical_xlsx": {
        "url": "https://icc.illinois.gov/downloads/public/pluginillinois/1HistoricalPricestoCompare.xlsx",
        "archived": "https://web.archive.org/web/20260813105137/https://icc.illinois.gov/downloads/public/pluginillinois/1HistoricalPricestoCompare.xlsx",
        "retrieved": "2026-08-16",
        "note": "ICC Plug In Illinois, Historical Prices to Compare, updated through August 2026. Committed copy: docs/tariff/sources/icc_pluginillinois_historical_ptc_wayback_20260813.xlsx"
      },
      "plugin_illinois_current": {
        "url": "https://plugin.illinois.gov/understanding-the-price-to-compare/price-to-compare-comed.html",
        "retrieved": "2026-08-16",
        "note": "Current PTC 10.399 cents/kWh, summer window June 1 to September 30, 2026; components 8.677 supply + 1.722 transmission."
      },
      "reconciled_bill_anchor": {
        "note": "Real ComEd residential bill, service window 2026-06-16 to 2026-07-16, printed PTC 10.399 cents/kWh, reconciled to its printed supply lines to the cent.",
        "retrieved": "2026-08-16"
      }
    }
  },
  "months": [
    {
      "month": "2017-01",
      "ptc": 6.318,
      "pea": -0.5,
      "source": "icc_historical_xlsx",
      "raw_date_in_source": "2017-01-15"
    },
    {
      "month": "2017-02",
      "ptc": 6.318,
      "pea": -0.5,
      "source": "icc_historical_xlsx",
      "raw_date_in_source": "2017-02-15"
    },
    {
      "month": "2017-03",
      "ptc": 6.318,
      "pea": -0.133,
      "source": "icc_historical_xlsx",
      "raw_date_in_source": "2017-03-15"
    },
    {
      "month": "2017-04",
      "ptc": 6.318,
      "pea": -0.5,
      "source": "icc_historical_xlsx",
      "raw_date_in_source": "2017-04-15"
    },
    {
      "month": "2017-05",
      "ptc": 6.318,
      "pea": -0.157,
      "source": "icc_historical_xlsx"
    },
    {
      "month": "2017-06",
      "ptc": 6.892,
      "pea": 0.152,
      "source": "icc_historical_xlsx"
    },
    {
      "month": "2017-07",
      "ptc": 6.892,
      "pea": 0.077,
      "source": "icc_historical_xlsx"
    },
    {
      "month": "2017-08",
      "ptc": 6.892,
      "pea": 0.19,
      "source": "icc_historical_xlsx"
    },
    {
      "month": "2017-09",
      "ptc": 6.892,
      "pea": 0.211,
      "source": "icc_historical_xlsx"
    },
    {
      "month": "2017-10",
      "ptc": 7.149,
      "pea": -0.5,
      "source": "icc_historical_xlsx"
    },
    {
      "month": "2017-11",
      "ptc": 7.149,
      "pea": -0.5,
      "source": "icc_historical_xlsx"
    },
    {
      "month": "2017-12",
      "ptc": 7.149,
      "pea": -0.5,
      "source": "icc_historical_xlsx",
      "raw_date_in_source": "2017-12-17"
    },
    {
      "month": "2018-01",
      "ptc": 7.195,
      "pea": -0.409,
      "source": "icc_historical_xlsx",
      "raw_date_in_source": "2018-01-17"
    },
    {
      "month": "2018-02",
      "ptc": 7.195,
      "pea": 0.29,
      "source": "icc_historical_xlsx",
      "raw_date_in_source": "2018-02-17"
    },
    {
      "month": "2018-03",
      "ptc": 7.195,
      "pea": -0.297,
      "source": "icc_historical_xlsx",
      "raw_date_in_source": "2018-03-17"
    },
    {
      "month": "2018-04",
      "ptc": 7.195,
      "pea": -0.5,
      "source": "icc_historical_xlsx",
      "raw_date_in_source": "2018-04-17"
    },
    {
      "month": "2018-05",
      "ptc": 7.195,
      "pea": -0.377,
      "source": "icc_historical_xlsx",
      "raw_date_in_source": "2018-05-17"
    },
    {
      "month": "2018-06",
      "ptc": 7.358,
      "pea": -0.024,
      "source": "icc_historical_xlsx",
      "raw_date_in_source": "2018-06-17"
    },
    {
      "month": "2018-07",
      "ptc": 7.358,
      "pea": -0.307,
      "source": "icc_historical_xlsx"
    },
    {
      "month": "2018-08",
      "ptc": 7.358,
      "pea": -0.088,
      "source": "icc_historical_xlsx"
    },
    {
      "month": "2018-09",
      "ptc": 7.356,
      "pea": -0.363,
      "source": "icc_historical_xlsx",
      "raw_date_in_source": "2018-09-18"
    },
    {
      "month": "2018-10",
      "ptc": 7.292,
      "pea": -0.5,
      "source": "icc_historical_xlsx",
      "raw_date_in_source": "2018-10-18"
    },
    {
      "month": "2018-11",
      "ptc": 7.292,
      "pea": -0.5,
      "source": "icc_historical_xlsx",
      "raw_date_in_source": "2018-11-18"
    },
    {
      "month": "2018-12",
      "ptc": 7.292,
      "pea": -0.5,
      "source": "icc_historical_xlsx"
    },
    {
      "month": "2019-01",
      "ptc": 7.219,
      "pea": -0.5,
      "source": "icc_historical_xlsx"
    },
    {
      "month": "2019-02",
      "ptc": 7.219,
      "pea": -0.5,
      "source": "icc_historical_xlsx"
    },
    {
      "month": "2019-03",
      "ptc": 7.219,
      "pea": -0.5,
      "source": "icc_historical_xlsx"
    },
    {
      "month": "2019-04",
      "ptc": 7.219,
      "pea": -0.5,
      "source": "icc_historical_xlsx"
    },
    {
      "month": "2019-05",
      "ptc": 7.219,
      "pea": -0.5,
      "source": "icc_historical_xlsx"
    },
    {
      "month": "2019-06",
      "ptc": 6.725,
      "pea": -0.08,
      "source": "icc_historical_xlsx"
    },
    {
      "month": "2019-07",
      "ptc": 6.725,
      "pea": -0.417,
      "source": "icc_historical_xlsx",
      "raw_date_in_source": "2019-07-19"
    },
    {
      "month": "2019-08",
      "ptc": 6.725,
      "pea": 0.419,
      "source": "icc_historical_xlsx",
      "raw_date_in_source": "2019-08-19"
    },
    {
      "month": "2019-09",
      "ptc": 6.723,
      "pea": -0.006,
      "source": "icc_historical_xlsx"
    },
    {
      "month": "2019-10",
      "ptc": 7.224,
      "pea": 0.117,
      "source": "icc_historical_xlsx"
    },
    {
      "month": "2019-11",
      "ptc": 7.224,
      "pea": -0.5,
      "source": "icc_historical_xlsx"
    },
    {
      "month": "2019-12",
      "ptc": 7.224,
      "pea": -0.497,
      "source": "icc_historical_xlsx",
      "raw_date_in_source": "2019-12-19"
    },
    {
      "month": "2020-01",
      "ptc": 7.175,
      "pea": -0.208,
      "source": "icc_historical_xlsx"
    },
    {
      "month": "2020-02",
      "ptc": 7.175,
      "pea": 0.212,
      "source": "icc_historical_xlsx"
    },
    {
      "month": "2020-03",
      "ptc": 7.175,
      "pea": -0.443,
      "source": "icc_historical_xlsx"
    },
    {
      "month": "2020-04",
      "ptc": 7.175,
      "pea": -0.309,
      "source": "icc_historical_xlsx"
    },
    {
      "month": "2020-05",
      "ptc": 7.175,
      "pea": 0.397,
      "source": "icc_historical_xlsx"
    },
    {
      "month": "2020-06",
      "ptc": 6.473,
      "pea": 0.191,
      "source": "icc_historical_xlsx"
    },
    {
      "month": "2020-07",
      "ptc": 6.473,
      "pea": 0.296,
      "source": "icc_historical_xlsx"
    },
    {
      "month": "2020-08",
      "ptc": 6.473,
      "pea": 0.5,
      "source": "icc_historical_xlsx"
    },
    {
      "month": "2020-09",
      "ptc": 6.473,
      "pea": 0.046,
      "source": "icc_historical_xlsx"
    },
    {
      "month": "2020-10",
      "ptc": 7.067,
      "pea": -0.5,
      "source": "icc_historical_xlsx"
    },
    {
      "month": "2020-11",
      "ptc": 7.067,
      "pea": -0.5,
      "source": "icc_historical_xlsx"
    },
    {
      "month": "2020-12",
      "ptc": 7.067,
      "pea": -0.5,
      "source": "icc_historical_xlsx"
    },
    {
      "month": "2021-01",
      "ptc": 7.069,
      "pea": -0.5,
      "source": "icc_historical_xlsx"
    },
    {
      "month": "2021-02",
      "ptc": 7.069,
      "pea": -0.362,
      "source": "icc_historical_xlsx"
    },
    {
      "month": "2021-03",
      "ptc": 7.069,
      "pea": 0.394,
      "source": "icc_historical_xlsx",
      "raw_date_in_source": "2021-03-21"
    },
    {
      "month": "2021-04",
      "ptc": 7.069,
      "pea": -0.164,
      "source": "icc_historical_xlsx"
    },
    {
      "month": "2021-05",
      "ptc": 7.069,
      "pea": 0.125,
      "source": "icc_historical_xlsx"
    },
    {
      "month": "2021-06",
      "ptc": 6.776,
      "pea": 0.072,
      "source": "icc_historical_xlsx"
    },
    {
      "month": "2021-07",
      "ptc": 6.776,
      "pea": 0.421,
      "source": "icc_historical_xlsx"
    },
    {
      "month": "2021-08",
      "ptc": 6.776,
      "pea": 0.5,
      "source": "icc_historical_xlsx"
    },
    {
      "month": "2021-09",
      "ptc": 6.776,
      "pea": 0.414,
      "source": "icc_historical_xlsx"
    },
    {
      "month": "2021-10",
      "ptc": 7.777,
      "pea": -0.5,
      "source": "icc_historical_xlsx"
    },
    {
      "month": "2021-11",
      "ptc": 7.777,
      "pea": -0.5,
      "source": "icc_historical_xlsx"
    },
    {
      "month": "2021-12",
      "ptc": 7.777,
      "pea": -0.5,
      "source": "icc_historical_xlsx"
    },
    {
      "month": "2022-01",
      "ptc": 7.809,
      "pea": -0.232,
      "source": "icc_historical_xlsx"
    },
    {
      "month": "2022-02",
      "ptc": 7.809,
      "pea": 0.5,
      "source": "icc_historical_xlsx"
    },
    {
      "month": "2022-03",
      "ptc": 7.809,
      "pea": 0.5,
      "source": "icc_historical_xlsx"
    },
    {
      "month": "2022-04",
      "ptc": 7.809,
      "pea": 0.115,
      "source": "icc_historical_xlsx",
      "raw_date_in_source": "2022-04-22"
    },
    {
      "month": "2022-05",
      "ptc": 7.809,
      "pea": 0.326,
      "source": "icc_historical_xlsx"
    },
    {
      "month": "2022-06",
      "ptc": 11.041,
      "pea": 0.193,
      "source": "icc_historical_xlsx"
    },
    {
      "month": "2022-07",
      "ptc": 11.041,
      "pea": 0.336,
      "source": "icc_historical_xlsx"
    },
    {
      "month": "2022-08",
      "ptc": 11.041,
      "pea": 0.5,
      "source": "icc_historical_xlsx"
    },
    {
      "month": "2022-09",
      "ptc": 11.049,
      "pea": 0.5,
      "source": "icc_historical_xlsx"
    },
    {
      "month": "2022-10",
      "ptc": 9.765,
      "pea": -0.5,
      "source": "icc_historical_xlsx"
    },
    {
      "month": "2022-11",
      "ptc": 9.765,
      "pea": -0.5,
      "source": "icc_historical_xlsx"
    },
    {
      "month": "2022-12",
      "ptc": 9.765,
      "pea": -0.5,
      "source": "icc_historical_xlsx"
    },
    {
      "month": "2023-01",
      "ptc": 9.665,
      "pea": -0.5,
      "source": "icc_historical_xlsx"
    },
    {
      "month": "2023-02",
      "ptc": 9.665,
      "pea": 0.102,
      "source": "icc_historical_xlsx"
    },
    {
      "month": "2023-03",
      "ptc": 9.665,
      "pea": 0.426,
      "source": "icc_historical_xlsx"
    },
    {
      "month": "2023-04",
      "ptc": 9.665,
      "pea": 0.5,
      "source": "icc_historical_xlsx"
    },
    {
      "month": "2023-05",
      "ptc": 9.665,
      "pea": 0.5,
      "source": "icc_historical_xlsx"
    },
    {
      "month": "2023-06",
      "ptc": 6.809,
      "pea": 0.5,
      "source": "icc_historical_xlsx"
    },
    {
      "month": "2023-07",
      "ptc": 6.809,
      "pea": -0.012,
      "source": "icc_historical_xlsx"
    },
    {
      "month": "2023-08",
      "ptc": 6.809,
      "pea": -0.824,
      "source": "icc_historical_xlsx"
    },
    {
      "month": "2023-09",
      "ptc": 6.799,
      "pea": -0.177,
      "source": "icc_historical_xlsx"
    },
    {
      "month": "2023-10",
      "ptc": 6.872,
      "pea": -0.354,
      "source": "icc_historical_xlsx"
    },
    {
      "month": "2023-11",
      "ptc": 6.872,
      "pea": -0.132,
      "source": "icc_historical_xlsx"
    },
    {
      "month": "2023-12",
      "ptc": 6.872,
      "pea": -0.674,
      "source": "icc_historical_xlsx"
    },
    {
      "month": "2024-01",
      "ptc": 6.848,
      "pea": -0.144,
      "source": "icc_historical_xlsx"
    },
    {
      "month": "2024-02",
      "ptc": 6.848,
      "pea": 0.207,
      "source": "icc_historical_xlsx"
    },
    {
      "month": "2024-03",
      "ptc": 6.848,
      "pea": -0.275,
      "source": "icc_historical_xlsx"
    },
    {
      "month": "2024-04",
      "ptc": 6.848,
      "pea": -0.479,
      "source": "icc_historical_xlsx"
    },
    {
      "month": "2024-05",
      "ptc": 6.848,
      "pea": 1.088,
      "source": "icc_historical_xlsx"
    },
    {
      "month": "2024-06",
      "ptc": 6.9,
      "pea": -0.167,
      "source": "icc_historical_xlsx"
    },
    {
      "month": "2024-07",
      "ptc": 6.902,
      "pea": -0.325,
      "source": "icc_historical_xlsx"
    },
    {
      "month": "2024-08",
      "ptc": 6.85,
      "pea": -0.198,
      "source": "icc_historical_xlsx"
    },
    {
      "month": "2024-09",
      "ptc": 6.85,
      "pea": -0.394,
      "source": "icc_historical_xlsx"
    },
    {
      "month": "2024-10",
      "ptc": 6.612,
      "pea": -1.785,
      "source": "icc_historical_xlsx"
    },
    {
      "month": "2024-11",
      "ptc": 6.47,
      "pea": -0.794,
      "source": "icc_historical_xlsx"
    },
    {
      "month": "2024-12",
      "ptc": 6.47,
      "pea": -0.81,
      "source": "icc_historical_xlsx"
    },
    {
      "month": "2025-01",
      "ptc": 6.552,
      "pea": -0.542,
      "source": "icc_historical_xlsx"
    },
    {
      "month": "2025-02",
      "ptc": 6.552,
      "pea": -0.089,
      "source": "icc_historical_xlsx"
    },
    {
      "month": "2025-03",
      "ptc": 6.552,
      "pea": 0.031,
      "source": "icc_historical_xlsx"
    },
    {
      "month": "2025-04",
      "ptc": 6.552,
      "pea": -0.335,
      "source": "icc_historical_xlsx"
    },
    {
      "month": "2025-05",
      "ptc": 6.552,
      "pea": 1.965,
      "source": "icc_historical_xlsx"
    },
    {
      "month": "2025-06",
      "ptc": 10.028,
      "pea": 0.527,
      "source": "icc_historical_xlsx"
    },
    {
      "month": "2025-07",
      "ptc": 10.028,
      "pea": -0.446,
      "source": "icc_historical_xlsx"
    },
    {
      "month": "2025-08",
      "ptc": 10.028,
      "pea": -0.029,
      "source": "icc_historical_xlsx"
    },
    {
      "month": "2025-09",
      "ptc": 10.027,
      "pea": 0.022,
      "source": "icc_historical_xlsx"
    },
    {
      "month": "2025-10",
      "ptc": 9.689,
      "pea": -1.469,
      "source": "icc_historical_xlsx"
    },
    {
      "month": "2025-11",
      "ptc": 9.689,
      "pea": -1.721,
      "source": "icc_historical_xlsx"
    },
    {
      "month": "2025-12",
      "ptc": 9.689,
      "pea": -0.849,
      "source": "icc_historical_xlsx"
    },
    {
      "month": "2026-01",
      "ptc": 9.66,
      "pea": 0.357,
      "source": "icc_historical_xlsx"
    },
    {
      "month": "2026-02",
      "ptc": 9.66,
      "pea": 0.889,
      "source": "icc_historical_xlsx"
    },
    {
      "month": "2026-03",
      "ptc": 9.66,
      "pea": -0.151,
      "source": "icc_historical_xlsx"
    },
    {
      "month": "2026-04",
      "ptc": 9.66,
      "pea": 1.159,
      "source": "icc_historical_xlsx"
    },
    {
      "month": "2026-05",
      "ptc": 9.66,
      "pea": 8.166,
      "source": "icc_historical_xlsx"
    },
    {
      "month": "2026-06",
      "ptc": 10.399,
      "pea": 0.23,
      "source": "icc_historical_xlsx"
    },
    {
      "month": "2026-07",
      "ptc": 10.399,
      "pea": 0.247,
      "source": "icc_historical_xlsx"
    },
    {
      "month": "2026-08",
      "ptc": 10.399,
      "pea": -0.142,
      "source": "icc_historical_xlsx"
    }
  ]
}