Sienna 3

Sienna 3 is a 576 MW solar + storage request in interconnection study in the CAISO interconnection queue, in San Bernardino County, California, connecting to SCE.

Queue statusIn planning

PlanningQueued Apr 2023 (current stage)
Consented (not yet reached)
Construction (not yet reached)
OperatingTarget Dec 2031 (not yet reached)
Closed (not yet reached)

Studies assess what grid upgrades the project would need and who pays for them. A signed interconnection agreement is the main step before construction.

Request details

Queue ID: 2268
Grid region: CAISO (California)
Utility / transmission owner: SCE
Connection point (POI): CALCITE 230 kV
Location: San Bernardino County, California
Technology: Solar: 288 MW · Battery: 288 MW
Total requested: 576 MW
Service type: Energy only (ERIS)
Study phase: Caiso Cluster 15 Unvalidated
Queue status: Active
Entered queue: 17 April 2023
Proposed online date: December 2031

Location

Marker shows the centre of San Bernardino County; the queue data does not give exact sites.

Power plants in California · Transmission lines in California

Other requests in San Bernardino County

Source: Lawrence Berkeley National Laboratory, Queued Up, data through end of 2025, compiled from ISO/RTO and utility queues. Check the grid operator's own queue for the latest status. Report a problem