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OpenAPI Specification

openapi: 3.2.0
info:
  title: emission-factors.com Utility Rate 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: Utility Rate
paths:
  /api/utility-rate:
    get:
      summary: Utility-specific electricity tariff from OpenEI URDB (upgrade from…
      operationId: utilityTariff
      parameters:
      - name: zip
        in: query
        required: false
        schema:
          type: string
          pattern: ^\d{5}(-?\d{4})?$
        example: '94105'
      - name: utility
        in: query
        required: false
        schema:
          type: string
        example: Pacific Gas & Electric Co
      - name: eiaid
        in: query
        required: false
        schema:
          type: integer
        example: 14328
        description: EIA utility ID
      - name: sector
        in: query
        required: false
        schema:
          type: string
          enum:
          - Residential
          - Commercial
          - Industrial
          - Lighting
          - RES
          - COM
          - IND
          default: Residential
        description: Case-insensitive; RES/COM/IND codes accepted
      - name: limit
        in: query
        required: false
        schema:
          type: integer
          minimum: 1
          maximum: 20
          default: 5
      responses:
        '200':
          description: Currently-active default tariffs with effective rate, tiers, TOU flag, and source PDF
        '400':
          description: No zip, utility, or eiaid provided, or an invalid sector or limit
        '404':
          description: Unknown ZIP code
        '503':
          description: OpenEI URDB API temporarily unavailable; retry (Retry-After header)
      tags:
      - Utility Rate