Monthly generator inventory history

Period

2015-07–2026-07

One row is

generator x dated assertion (month of change, or the inventory year), with the source and kind of assertion on every row

Built from source rows of

generator x report_date (month of change) with valid_until_date

Evidence and method

reported · derivedHistorical monthly assertions and first-seen evidence only; current inventory uses the complete pinned eia860m-inventory workbook. Validity is half-open; expired assertions never establish current state.

Origin

U.S. EIA Form 860M (monthly generator inventory) as a changelog: one row per generator per month in which any tracked attribute changed, valid until the next change ↗Source notice and licenceLicence: CC-BY-4.0

Built from source rows of

Not declared

Evidence and method

Not declared · not declaredPreliminary monthly estimates; subsequent editions can revise values. Current assertions use the complete pinned workbook; cancelled and indefinitely postponed units share a sheet and are not distinguished.

Origin

Preliminary Monthly Electric Generator Inventory, August 2026 ↗Source notice and licenceLicence: U.S. government work

Built from source rows of

generator x report_date (annual)

Evidence and method

reported · derived

Origin

U.S. EIA Form 860 (mix of EIA forms, harvested) ↗Source notice and licenceLicence: CC-BY-4.0

Edition in this release

PUDL v2026.9.0 (embedded 2026.8.1.dev50) · out_eia__yearly_generators · retrieved 2026-09-29PUDL v2026.9.0 (embedded 2026.8.1.dev50) · core_eia860m__changelog_generators · retrieved 2026-09-29no publisher edition or metadata date stated; retrieved 2026-09-29T04:57:19Z · · retrieved 2026-09-29

Download

inventory_history.parquet ↓12,259 rows · 199 KBinventory_change.parquet ↓1,789 rows · 16 KB

• Baselinepudl-generators · inventory year
  2024
• Historypudl-860m-changelog · monthly
  2015-07 to 2026-07
• Latest workbookeia860m-inventory · coverage verified
  2026-08-01report month

• Listed without a reported value · capacityRows with no value for this measure; published as null, never zero
  2,882 assertions
• Editions not comparableGenerators in the current workbook with no baseline inventory-year row and not new since the baseline (first seen, or operating, before the baseline year ended): the two editions cannot be compared for them
  152 generators
• No row in the sourceGenerators with historical monthly assertions and no row in the pinned current workbook: their current state is unknown, and an expired assertion never establishes it
  52 generators
• Outside the atlas frameEIA-860M changelog rows for generators outside the frame authorities, the core states and the published plants
  213,214 source rows

Publisher

Form EIA-860M is EIA's Preliminary Monthly Electric Generator Inventory. Its page lists one release for each month of data.www.eia.gov/electricity/data/eia860m/ ↗

Delay

On the checked date EIA's page gave a release date of September 24, 2026 for August 2026 data and listed the next release as October 23, 2026.www.eia.gov/electricity/data/eia860m/ ↗

This atlas

History is read through PUDL's EIA-860M changelog, published in Catalyst Cooperative's quarterly versioned releases; the current edition is the complete monthly workbook pinned in the registry, and the baseline is the EIA-860 inventory year. Each is named under edition, and the tables change only when a pin moves. No timed refresh.docs.catalyst.coop/pudl/en/v2026.9.0/data_access.html ↗www.eia.gov/electricity/data/eia860m/ ↗

• latest.complete_edition{"national_rows":39996,"report_month":"2026-08-01","rows_without_plant_id":{"Retired":12},"sheet_rows":{"Canceled or Postponed":1741,"Operating":28377,"Operating_PR":228,"Planned":2311,"Planned_PR":5,"Retired":7324,"Retired_PR":10},"valid_rows":39996}
  Passed
• latest.valid_at_edition{"report_month":"2026-08-01","rows_outside_validity":0}
  Passed
• keys.latest_generator_unique{"distinct":1789,"rows":1789}
  Passed
• latest.lifecycle_codes_mapped{"unmapped_status_codes":0}
  Passed
• latest.changes_since_baseline{"capacity_changed":16,"entered_service":67,"new_since_baseline":29,"not_comparable":152,"retired_or_cancelled":21,"status_changed":64,"unchanged":1440}
  Passed

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