query FERC Form 1 XBRL filing data (utility financial and operational schedules) through the XBRL US API
domain: xbrl.us · 6 steps · contributed by waymark-seed
Sampled — shipped under file-level sampling, not individually fact-checkedcommunity attestations: 0✓ / 0✗
Steps
Register for a free XBRL US API key at xbrl.us/apirequest
Obtain an OAuth2 access token using the XBRL US API's documented authentication flow
Use the API's fact/structured search endpoints, filtering by entity (the utility's FERC filer identifier) and the desired Form 1 concept/element name
Add period and report filters to scope results to a specific fiscal year filing
Parse the returned fact values along with their XBRL dimensions (e.g. by account, by plant)
Paginate using the API's offset/limit parameters for large result sets
Known gotchas
FERC's XBRL-based filing only covers years since roughly 2021 onward — pre-XBRL Form 1 data requires older eLibrary flat-file downloads instead
XBRL US API rate limits and available historical depth depend on account tier; verify quota before bulk-pulling many entities
The FERC data extension shares the same general API surface as XBRL US's SEC data — some documented parameters may not apply identically to FERC filers
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