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Market Notice
March 14, 2019


Action Date


Legal and Regulatory


System Operations

Generation Interconnection Applications: Cluster 12 Application Window


The California ISO will open the Cluster 12 Application Window for Generation Interconnection Request Applications from April 1, 2019 to April 15, 2019. Interconnection customers may only submit application requests during this window to be included in Cluster 12.


In addition, it is of critical importance that interconnection customers review the following new tariff revisions, available at, relevant to initiating an IR:

  • New minimum IR tariff requirements described in Tariff Section 3.5.1 Initiating an Interconnection Request
  • Revisions to the IR validation processes described in Tariff Section 3.5.2 Validation of Interconnection Request

 These changes were approved by the ISO board and filed at the Federal Energy Regulatory Commission (FERC) on Feb. 7, 2019. The FERC filing is available at


The Interconnection Request and Study Agreement Form (Appendix 1) for the Generator Interconnection and Deliverability Allocation Procedures (GIDAP), new generator facility data forms (Attachment A to Appendix 1), as well as completed sample forms, and application process and materials have been posted to the ISO website at


The current tariff applicable to the Generator Interconnection Process is Tariff Appendix DD, available at


For additional information on Cluster 12 process milestones and schedule, the GIDAP Customer Guidelines summary is available at


Customers submitting interconnection requests for proposed energy storage facilities who desire firm charging service to reduce the risk of curtailments during charging must contact their interconnecting participating transmission owner (PTO) to request separate firm load interconnection studies. The ISO will request additional operational information/characteristics prior to scoping meetings for these types of projects. Storage project customers will submit the same interconnection request identified above. Please include any applicable additional information related to the project with the Interconnection Request submittal.


Interconnection Resources Team at or any Interconnection Specialist

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California Independent System Operator | P.O. Box 639014 | Folsom, CA 95630 | United States