Electric operation and maintenance expenses (FERC Form 1)

Period

2015–2025

One row is

linked FERC Form 1 respondent x report year x expense type, electric

Built from source rows of

respondent x report year x expense type

Evidence and method

reported · directrow_type_xbrl = calculated_value marks subtotals; utility_type separates electric, gas and total; nominal dollars

Origin

FERC Form 1 Schedule 320, Electric Operation and Maintenance Expenses (Accounts 500-935) by expense type ↗Source notice and licenceLicence: CC-BY-4.0

Built from source rows of

FERC Form 1 respondent

Evidence and method

reported · directData transformed by PUDL from FERC Form 1 filings; selected fields republished

Origin

PUDL association of FERC Form 1 respondent ids to PUDL utility ids ↗Source notice and licenceLicence: CC-BY-4.0

Edition in this release

PUDL v2026.9.0 (embedded 2026.8.1.dev50) · core_pudl__assn_ferc1_pudl_utilities · retrieved 2026-09-29PUDL v2026.9.0 (embedded 2026.8.1.dev50) · out_ferc1__yearly_operating_expenses_sched320 · retrieved 2026-09-29

Download

money_expenses.parquet ↓8,378 rows · 44 KB

• RespondentsFERC Form 1 respondents linked to an EIA utility by the reviewed crosswalk ferc1_utility_link, every report year the table holds; the source states no final or provisional status, and revisions arrive for months after the April deadline
  6 utilities
• Listed, 2015–2025
  66 of 66 utility-years

• Listed without a reported value · expenseRows with no value for this measure; published as null, never zero
  55 rows
• No row in the sourceReport years the table holds in which a linked respondent has no row in this schedule: not filed, or not in the pinned PUDL release; the table cannot tell which
  0 utility-years
• Not applicableOrganizations of this release with no reviewed link to a FERC Form 1 respondent, their pages marked not a respondent: public power, cooperatives, federal agencies and companies that are not utilities file no Form 1. Their figures are absent, not zero
  544 organizations
• Outside the atlas frameSchedule rows for the report years the table holds, filed by FERC Form 1 respondents with no reviewed link to a utility of this release
  160,969 source rows
• In the source, not yet includedSchedule rows of the linked respondents for report years outside the years the table holds: in the pinned PUDL release, not yet included: 1994–2014
  13,528 source rows

Publisher

PUDL's source page describes FERC Form 1 as a comprehensive financial and operating report submitted annually by major electric utilities, licensees and others, and says new XBRL filings are added to FERC's RSS feed on a rolling basis.docs.catalyst.coop/pudl/en/v2026.9.0/data_sources/ferc1.html ↗

Delay

PUDL's source page states that annual responses are due in April of the following year and that revisions and late filings typically continue to trickle in for months after the filing deadline. The tables' last report year is the one stated under coverage.docs.catalyst.coop/pudl/en/v2026.9.0/data_sources/ferc1.html ↗

This atlas

The atlas reads FERC Form 1 through PUDL, which Catalyst Cooperative publishes as quarterly versioned releases. Each atlas release pins one PUDL version, named under edition; the tables change only when that pin moves. No timed refresh.docs.catalyst.coop/pudl/en/v2026.9.0/data_access.html ↗

• money.ferc1_link_reviewed{"eia_utilities":6,"ferc1_respondents":6}
  Passed

No corrections apply to this dataset in this release. Earlier editions: not available (earlier releases did not retain per-dataset edition comparisons).