generated: '2026-07-27'
method: searched
source: openapi/ercot-public-data-api-openapi.json
docs: https://developer.ercot.com/applications/pubapi/user-guide/registration-and-authentication/
description: >-
  Every ERCOT Public Data API call carries TWO credentials, not one: an Azure API Management
  subscription key AND an Azure AD B2C ID token. The OpenAPI declares only the subscription-key
  half (apiKeyHeader / apiKeyQuery); the bearer half is documented only in the developer portal,
  so this profile is upgraded from the spec-derived baseline with the documented token flow.
  Registration is free and self-serve at the ERCOT API Explorer (email verification, then
  subscribe to a product to mint a subscription key). The market-participant SOAP estate
  (EWS, MarkeTrak, Retail API) uses a completely different model — ERCOT-issued digital
  certificates plus WS-Security — and is not reachable with these credentials.
summary:
  types:
  - apiKey
  - http
  - oauth2
  api_key_in:
  - header
  - query
  oauth2_flows:
  - password
schemes:
- name: apiKeyHeader
  type: apiKey
  in: header
  parameter: Ocp-Apim-Subscription-Key
  required: true
  description: Azure API Management subscription key, minted per product subscription in the API Explorer profile page.
  sources:
  - openapi/ercot-public-data-api-openapi.json
  - https://developer.ercot.com/applications/pubapi/user-guide/using-api/
- name: apiKeyQuery
  type: apiKey
  in: query
  parameter: subscription-key
  required: false
  description: Query-string alternative to the Ocp-Apim-Subscription-Key header.
  sources:
  - openapi/ercot-public-data-api-openapi.json
- name: b2cIdToken
  type: http
  scheme: bearer
  bearerFormat: JWT
  required: true
  description: >-
    Azure AD B2C ID token passed as `Authorization: Bearer <id_token>`. Not declared in the
    OpenAPI but mandatory — calls without it are rejected. Tokens are valid for one hour and
    cannot be refreshed; a new POST to the token endpoint mints another.
  sources:
  - https://developer.ercot.com/applications/pubapi/user-guide/registration-and-authentication/
- name: ercotB2C
  type: oauth2
  flow: password
  grant_type: password
  token_url: https://ercotb2c.b2clogin.com/ercotb2c.onmicrosoft.com/B2C_1_PUBAPI-ROPC-FLOW/oauth2/v2.0/token
  authorization_url: https://ercotb2c.b2clogin.com/ercotb2c.onmicrosoft.com/b2c_1_pubapi-ropc-flow/oauth2/v2.0/authorize
  jwks_uri: https://ercotb2c.b2clogin.com/ercotb2c.onmicrosoft.com/b2c_1_pubapi-ropc-flow/discovery/v2.0/keys
  issuer: https://ercotb2c.b2clogin.com/6df17afa-1b36-499a-83f7-56779ad0b9a6/v2.0/
  client_id: fec253ea-0d06-4272-a5e6-b478baeecd70
  scope: openid+fec253ea-0d06-4272-a5e6-b478baeecd70+offline_access
  response_type: id_token
  token_lifetime_seconds: 3600
  description: >-
    Azure AD B2C Resource Owner Password Credentials (ROPC) user flow. The developer's portal
    username and password are POSTed directly to the token endpoint; the response carries
    access_token, refresh_token and the id_token the API actually consumes. ROPC is a legacy
    OAuth 2.0 grant — credentials are handled by the client, so they must be stored securely.
  sources:
  - https://developer.ercot.com/applications/pubapi/user-guide/registration-and-authentication/
  - well-known/ercot-openid-configuration.json
registration:
  url: https://apiexplorer.ercot.com/
  self_serve: true
  cost: free
  steps:
  - Sign up on the ERCOT API Explorer with an email address and verification code.
  - Subscribe to a product on the Products page to mint a subscription key.
  - Copy the Primary key from the profile page (once — it is reusable).
  - POST username/password to the B2C token endpoint for an ID token (repeat hourly).
other_estates:
- api: ERCOT Web Services (EWS)
  model: ERCOT-issued digital certificate + WS-Security (WSS 2004/01) over SOAP
  audience: registered ERCOT Market Participants only
- api: ERCOT MarkeTrak API
  model: ERCOT digital certificate; application must pass ERCOT certification before production access
  audience: registered ERCOT Market Participants only
- api: ERCOT Retail API
  model: ERCOT digital certificate over SOAP (TX SET transactions)
  audience: certified Market Participants only