Authenticate to the ERCOT Public API (EMIL) via Azure AD B2C OAuth2 and retrieve a specific dataset by its EMIL/report ID.

Verified steps

1. Register an account on apiexplorer.ercot.com (email verification plus password creation).
2. In API Explorer, subscribe to the Public Data API product and copy the primary subscription key from your profile page.
3. Obtain a bearer ID token by POSTing to ERCOT's published Azure AD B2C ROPC token endpoint with your username, password, grant_type=password, response_type=id_token, the client_id ERCOT publishes for this flow in its own API documentation (use <CLIENT_ID> as a placeholder rather than hardcoding it), and the documented scope value.
4. Call the desired report at https://api.ercot.com/api/public-reports/<emilId>/<endpoint> (the EMIL ID must be lowercase in the URL) with headers Ocp-Apim-Subscription-Key: <SUBSCRIPTION_KEY> and Authorization: Bearer <ID_TOKEN>.
5. EMIL stands for ERCOT Market Information List — the catalog of ERCOT public data products/reports, each identified by an EMIL/report ID (e.g. NP6-346-CD) used in the URL path.
6. To discover available document IDs first, use the archive-style endpoint /api/public-reports/archive/<emilId>, filtered by postDatetimeFrom/postDatetimeTo.