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OpenAPI Specification

openapi: 3.2.0
info:
  title: emission-factors.com Plant Emissions API
  version: 2.1.0
  description: 'US electricity and fuel emission data by ZIP code: EPA eGRID Scope 2 factors (location-based) with the Green-e residual mix (market-based), Scope 1 fuel factors, EIA retail rates and hourly grid intensity, EPA CAMD plant emissions and OpenEI utility tariffs. Free, no key. Query parameters and JSON body fields not listed here are rejected with 400.'
  contact:
    url: https://emission-factors.com
  license:
    name: 'Data licenses vary by source: US government works (public domain); eGRID2024, GHG Hub 2026, OpenEI URDB and ZIP-to-utility data, and GeoNames are CC-BY-4.0; the Green-e residual mix is published by the Center for Resource Solutions. See /methodology.'
    url: https://emission-factors.com/methodology
servers:
- url: https://emission-factors.com
  description: Production
tags:
- name: Plant Emissions
paths:
  /api/plant-emissions:
    get:
      summary: 'Unit-level emissions from EPA CAMD (fossil units >25 MW): per-facility summary…'
      description: CAMD publishes by quarter; the default window ends on latest_published_date (last day of the latest quarter that ended 45+ days ago). Queries over the record limit are rejected with the count, never truncated. NOx/SO2 in the summary are lb.
      operationId: plantEmissions
      parameters:
      - name: facility_id
        in: query
        required: false
        schema:
          type: integer
        example: 3
        description: EPA CAMD/ORIS facility code (facility_id or state is required)
      - name: state
        in: query
        required: false
        schema:
          type: string
        example: TX
        description: US state, 2-letter code or full name (TX or Texas), for a state-wide aggregate
      - name: days
        in: query
        required: false
        schema:
          type: integer
          minimum: 1
          maximum: 90
          default: 7
        description: Counted back from latest_published_date
      - name: begin
        in: query
        required: false
        schema:
          type: string
          format: date
        description: Custom window start (with end; overrides days; max 366 days)
      - name: end
        in: query
        required: false
        schema:
          type: string
          format: date
        description: Custom window end (with begin)
      - name: format
        in: query
        required: false
        schema:
          type: string
          enum:
          - summary
          - hourly
          default: summary
        description: 'hourly returns raw CAMD unit-hour records (large: use facility_id and a short window)'
      - name: limit
        in: query
        required: false
        schema:
          type: integer
          minimum: 1
          maximum: 500
          default: 25
        description: Facilities returned in summary mode, largest CO2 first
      responses:
        '200':
          description: Per-facility emissions summary or raw hourly records
        '400':
          description: Invalid or missing parameters, an ID or date CAMD rejects, or a query over the record limit
        '503':
          description: EPA CAMD API temporarily unavailable (Retry-After header), or the server key is not configured
      tags:
      - Plant Emissions