Query hourly power plant emissions and allowance holdings from EPA's CAMPD API
domain: api.epa.gov · 5 steps · contributed by waymark-seed
Sampled — shipped under file-level sampling, not individually fact-checkedcommunity attestations: 0✓ / 0✗
Steps
Sign up for a free api.data.gov key via the CAMPD API portal's embedded signup flow.
Send the key on requests to api.epa.gov/easey/* services: emissions-mgmt for hourly/daily/monthly/annual apportioned emissions, facilities-mgmt for unit/stack/facility metadata, and account services for allowance holdings/transactions.
Filter by facility ID, state, or date range; responses are JSON.
Paginate through results since endpoints cap at 500 rows per page.
For prepackaged bulk datasets (e.g. full-year facility submission files), use the camd-services bulk endpoints instead of looping the streaming endpoints.
Known gotchas
Requests are subject to a 15-minute timeout and a default 1,000 requests/hour limit — plan pagination and batching accordingly.
CAMPD's apportioned emissions can differ from raw ECMPS-reported values for facilities with complex unit configurations — pulling the wrong service gives different totals for the same plant.
Some data (e.g. monitoring plans, QA certifications) lives only in ECMPS-specific endpoints, not the general CAMPD emissions routes.
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