APS Interconnection Process 2026: Application Requirements and Submission Guide.

Arizona Public Service Generator Interconnection Application Submission Guide 

(1.) Generator Interconnection Data Package Checklist

The following technical documentation must accompany the interconnection application. Failure to provide consistent data across these formats is a primary cause of application deficiencies. 

• Interconnection Request Form:
  • For requests < 20 MW: Small Generator Interconnection Request. 
  • For requests > 20 MW: Appendix 1 to LGIP Interconnection Request. 
  • Note: Data must be replicated exactly in the PowerClerk Application and in writing within Appendix 1 of the Business Practice. 
• Inverter Based Resource (IBR) Data Sheet: Required for all IBR projects. Data must be replicated exactly in PowerClerk and in writing within Appendix 2.
  • Single Line Diagram (SLD): A detailed diagram showing the project from generator terminals to the Point of Interconnection (POI). 
  • Site Layout: A drawing showing the physical arrangement of the facility. 
• Manufacturer Supporting Documentation:
  • Detailed equipment specification sheets.
  • Ambient temperature and elevation de-rating curves. 
  • P-Q Diagrams: For energy storage projects, the diagram must explicitly show all four quadrants. 
• Modeling Files: WECC-approved power flow (.epc) and dynamic models (.dyd) in GE PSLF format providing a detailed equivalent representation of the project. 
• Performance Demonstration: Documentation verifying model performance in dynamic simulations (pre-disturbance “flat run” and post-disturbance “bump test”). 
• Electromagnetic Transient (EMT) Models:
  • Mandated for all Interconnection Requests and are required prior to the start of the facilities studies 
  • For projects in the Transitional Cluster Study, EMT models are required on an as-needed basis upon APS notification.