Authentification with SMUD not possible

[juchatz]

Issue Summary
The Opower integration in Home Assistant was failing with a KeyError: 'redirectUrl' error when attempting to authenticate with SMUD (Sacramento Municipal Utility District).
Investigation Steps

Initial Error Analysis:
The original error occurred because the Opower integration was expecting a 'redirectUrl' parameter in the authentication response, but this parameter was missing.

Authentication Flow Analysis:
I created an external Python script to test the SMUD authentication flow directly, which revealed:

• SMUD's authentication system has significantly changed
• The login process now involves different redirection patterns
• The expected 'redirectUrl' parameter is no longer present in responses
• The Okta-based SSO that the integration was designed for appears to be gone or changed

Authentication Testing:
I attempted to follow the new authentication flow but were unable to successfully authenticate, possibly due to:

• Changes in how SMUD handles account selection
• Additional security measures in the authentication process
• Potential multi-factor authentication requirements

Conclusions
The Opower integration for SMUD is failing because SMUD has fundamentally changed their authentication system, removing or altering the Okta-based SSO flow that the integration was designed to use. The missing 'redirectUrl' parameter indicates that the underlying API or authentication mechanism has changed substantially.

Versioning:
Opower: 0.9
HA:

• Core 2025.3.3
• Frontend 20250306.0

[jwiegley]

Just got bit by this today myself. I'd love to see this!