The California ISO implementation of the first phase of the Production Application Programming Interface (API) Web Service (WS) Uniform Resource Locator (URL) cutovers is scheduled for Nov. 13, 2023 and will make the new Production API WS URLs available. The next and final phase of the Production API WS URL cutovers is scheduled for Dec. 28, 2023 and will move the existing Production API WS URLs to new infrastructure.

Phase 1 - Nov. 13, 2023

• No changes to existing API WS URLs: https://ws.caiso.com/sst/<SYSTEM>/<SERVICE>
• New API WS URLs will be available: https://ws.prod.caiso.com/sst/<SYSTEM>/<SERVICE>
• Access to the new API WS URLs consist of the following that will require users to be configured per below:
  • New IPs: Please open the entire 45.42.16.0/21 network on ports 80 & 443 for the new CAISO IP space
  • New Certificate Authority (was Verizon and is now Entrust): Please add the two Entrust certificates to your application trust stores on your servers
  • Global Rate Limit
    • 30 per second across all the WS below combined per TCP source supported on the WS endpoint (1800 connections per minute); this includes submits and retrieves:
      • BAAOP
      • BSAP
      • CIRA
      • CMRI
      • DRRS
      • EIDE
      • ALFS (& FDR)
      • MF
      • PISOA
      • RCBSAP
      • RCSERVICES (RCEIDE)
      • SIBR
      • STLMT
      • OMS
      • ECIC
    • Service-Level Acceptable Use Policy (AUP) for CMRI, DRRS, and MRI-S
      • In addition to the Global Rate Limit above, these systems will have an additional layer of protection
      • CMRI
        • retrieves will leverage a 5-second period for enforcement
        • there are no CMRI submits
      • DRRS
        • Both submits and retrieves will leverage a 30-second period for enforcement
      • MRI-S (STLMT)
        • retrieves will leverage a 30-second period for enforcement
        • submits will not have any additional layer of protection other than the Global Rate Limit above

Phase 2 - Dec. 28, 2023

• No additional changes to the new API WS URLs made available in Phase 1: https://ws.prod.caiso.com/sst/<SYSTEM>/<SERVICE>
• The existing API WS URLs: https://ws.caiso.com/sst/<SYSTEM>/<SERVICE> will be cutover to new underlying infrastructure
• Access to the existing API WS URLs will now also require users to be configured per below (same as above):
  • New IPs
  • New Certificate Authority (was Verizon and is now Entrust)
  • Global Rate Limit
  • Service-Level Acceptable Use Policy (AUP) for CMRI, DRRS, and MRI-S

Customers are encouraged to contact Trang Vo at the below contact information and/or submit a CIDI case for any questions.

Please contact Trang Vo at tvo@caiso.com or release@caiso.com with any questions.