BUTTONBUSH SOLAR HYBRID ENERGY CENTER
1,636 MW hybrid in Kern, CA · In queue since April 2019 · Proposed COD December 2026
1,636 MW
Capacity
2
Components
Solar + Battery
7y 1m
In Queue
IA Executed
IA Status
Signed Nov 2021
Queue → IA
2y 7m
IA → COD
5y 1m
Total Duration
2y 7m
Interconnection request submitted to ISO/RTO
CAISO uses cluster studies where projects are batched annually and studied together.
Typical: 36–48 months (IR to IA)
Interconnection agreement executed — binding commitment to build
Typical: 30–60 days (negotiation)
Project under construction
Typical: 18–30 months
Proposed COD: 2026-12-01
The Buttonbush Solar Hybrid Energy Center is a proposed project located in Kern County, California, with a total capacity of 1636 MW. The project, which has appeared in recent news, is a hybrid facility consisting of 818 MW of solar generation and 818 MW of battery energy storage.
The project is listed in the CAISO interconnection queue as CAISO-1596, with an initial queue entry date of April 15, 2019. The proposed commercial operation date is December 1, 2026. An Interconnection Agreement (IA) has been executed for the project on November 15, 2021. The point of interconnection is the Midway 500 kV substation.
Generated from interconnection queue and public data sources
State
CA
County
Kern
Grid Region
CAISO (California)
Market
ISO/RTO Member
Developer
—
Utility
PGAE
Entity
CAISO
Service Type
—
Point of Interconnection
Midway 500 kV
Data Source
LBNL + Live
- ISO / RTO
- CAISO
- Trading Hub
- TH_SP15_GEN-APND
- Hub Confidence
- MEDIUM
- Nearest Node (Estimated)
- MIDWAY_1_N084
- POI Substation
- Midway Substation
This project's market context is estimated from its Point of Interconnection. Hub and node assignments are approximate and based on geographic inference from the POI substation name.
