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OpenAPI Specification

openapi: 3.2.0
info:
  title: emission-factors.com Intensity 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: Intensity
paths:
  /api/intensity:
    get:
      summary: Hourly grid carbon intensity (EIA-930 fuel mix derived, data lags up to ~1 day)
      operationId: hourlyIntensity
      parameters:
      - name: zip
        in: query
        required: false
        schema:
          type: string
          pattern: ^\d{5}(-?\d{4})?$
      - name: ba
        in: query
        required: false
        schema:
          type: string
        example: CISO
        description: Balancing authority code (CISO, ERCO, PJM, NYIS, MISO, etc.)
      - name: hours
        in: query
        required: false
        schema:
          type: integer
          minimum: 1
          maximum: 168
          default: 24
      - name: aggregate
        in: query
        required: false
        schema:
          type: string
          enum:
          - hour_of_day
        description: Return 24-hour averaged profile across window + cleanest/dirtiest hour + swing ratio
      responses:
        '200':
          description: Hourly intensity array or aggregated profile
        '400':
          description: Missing ZIP/BA or unknown BA
        '404':
          description: ZIP not in EIA-930 coverage (AK, HI, PR)
        '503':
          description: EIA-930 API temporarily unavailable; retry (Retry-After header)
      tags:
      - Intensity