BELLEFIELD 2 SOLAR FARM (CAISO-1631) — Project Summary

Queue ID
CAISO-1631
Capacity
1000 MW
Technology
Solar+Battery
Status
active
Location
Kern, CA
Region
CAISO
Developer
IA Status
IA Executed

BELLEFIELD 2 SOLAR FARM

CAISO-1631BetaActiveSolarBatteryCAISOLBNL + Live

1,000 MW hybrid in Kern, CA · In queue since April 2019 · Proposed COD September 2024

1,000 MW

Capacity

2

Components

Solar + Battery

7y 1m

In Queue

IA Executed

IA Status

Signed Feb 2021

Status
Latest milestonePhase 1 completion · 2025-06NS Energy · 2025-06-18
Expected COD2026-Q4NS Energy · 2025-06-18
Interconnection

Queue → IA

1y 10m

IA → COD

3y 7m

Total Duration

1y 10m

Schedule

20 months past proposed COD

Construction75%
Queue EntryApr 15, 2019

Interconnection request submitted to ISO/RTO

Cluster Study (Phase I/II)

CAISO uses cluster studies where projects are batched annually and studied together.

Typical: 36–48 months (IR to IA)

Interconnection AgreementFeb 7, 2021

Interconnection agreement executed — binding commitment to build

Typical: 30–60 days (negotiation)

ConstructionCurrent

Project under construction

Typical: 18–30 months

Commercial Operation

Proposed COD: 2024-09-01

Technology
Solar500 MW · 50%
Battery500 MW · 50%
About

The BELLEFIELD 2 SOLAR FARM is a proposed 1000 MW hybrid solar and battery energy storage project in Kern County, California. The development project consists of 500 MW of solar photovoltaic generation and 500 MW of battery energy storage. It is located within the CAISO region and is interconnected with Southern California Edison (SCE) at the Windhub Substation 220kV.

The project, identified as CAISO-1631 in the CAISO interconnection queue, entered the queue on April 15, 2019, and has a proposed commercial operation date of September 1, 2024. An Interconnection Agreement (IA) was executed on February 7, 2021. The BELLEFIELD 2 SOLAR FARM project has been featured in recent news coverage.

Generated from interconnection queue and public data sources

Project Details

State

CA

County

Kern

Grid Region

CAISO (California)

Market

ISO/RTO Member

Developer

Utility

SCE

Entity

CAISO

Service Type

Point of Interconnection

Windhub Substation 220kV

Data Source

LBNL + Live

DeveloperAES CorporationNS Energy · 2025-06-18
Market Context
Approximate
ISO / RTO
CAISO
Trading Hub
TH_SP15_GEN-APND
Hub Confidence
MEDIUM
Nearest Node (Estimated)
ALTA6B2_7_N003
POI Substation
Windhub 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.

News & Articles (1)Beta

Last updated 2026-03-26

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