Sienna Solar 2

Sienna Solar 2 is a 112 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 2021 (current stage)
ConsentedNov 2024 (not yet reached)
Construction (not yet reached)
OperatingTarget Mar 2029 (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: 2097
Grid region: CAISO (California)
Utility / transmission owner: SCE
Connection point (POI): Calcite Substation 230 kV
Location: San Bernardino County, California
Technology: Solar: 56.0 MW · Battery: 56.0 MW
Total requested: 112 MW
Service type: Network resource (NRIS)
Study phase: In Progress
Queue status: Active
Entered queue: 15 April 2021
Agreement signed: 22 November 2024
Proposed online date: March 2029

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