{ "source": "PUDL stable core_ferc1__yearly_plant_in_service_sched204.parquet (FERC Form 1 Schedule 204 / plant in service), filtered ferc_account_label=station_equipment_transmission_plant (FERC Account 353)", "retrieved": "2026-08-19", "parquet_url": "https://s3.us-west-2.amazonaws.com/pudl.catalyst.coop/stable/core_ferc1__yearly_plant_in_service_sched204.parquet", "parquet_etag": "d8fd36a8d0241085cf561d0a7b62bc60", "note": "additions column = gross additions to Account 353 during report year, USD nominal. All FERC Form 1 respondents (IOUs + some others); APPA/NRECA gap applies per d035.", "annual_aggregate_2018_2025": [ { "report_year": 2018, "n_utilities": 162, "additions_usd": 8558455700.0, "ending_balance_usd": 106840950027.0 }, { "report_year": 2019, "n_utilities": 168, "additions_usd": 8793848093.0, "ending_balance_usd": 115982680996.0 }, { "report_year": 2020, "n_utilities": 173, "additions_usd": 9722953854.0, "ending_balance_usd": 124770630201.0 }, { "report_year": 2021, "n_utilities": 176, "additions_usd": 8801328666.0, "ending_balance_usd": 133144398209.0 }, { "report_year": 2022, "n_utilities": 177, "additions_usd": 8013793361.0, "ending_balance_usd": 139667261254.0 }, { "report_year": 2023, "n_utilities": 176, "additions_usd": 9311857789.25, "ending_balance_usd": 148704420865.25 }, { "report_year": 2024, "n_utilities": 183, "additions_usd": 11175250150.0, "ending_balance_usd": 158928285137.25 }, { "report_year": 2025, "n_utilities": 191, "additions_usd": 12307630850.0, 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