How big is Edwards Sanborn E4?

Edwards Sanborn E4 has a reported capacity of 248.9 MW. Source: EIA Form 860.

What kind of plant is Edwards Sanborn E4?

Edwards Sanborn E4 is a Batteries, Solar Photovoltaic facility in Kern County, CA, participating in the CAISO market.

Where is Edwards Sanborn E4 located?

Edwards Sanborn E4 is in Kern County, CA, inside the CAISO balancing area.

Who operates Edwards Sanborn E4?

Edwards Sanborn E4 is operated by Terra-Gen Operating Co-Hybrid according to the EIA generator inventory. Reporting membership does not by itself establish ultimate ownership.

When did Edwards Sanborn E4 start operating?

Edwards Sanborn E4 reports a commercial operation date of 2024. Current status: operating. Source: EIA Form 860.

How much electricity does Edwards Sanborn E4 generate?

Edwards Sanborn E4 reported 326.7 GWh over the twelve months to 2026-04. Figures are net generation as filed to EIA-923.

How does Edwards Sanborn E4 compare to other plants?

By capacity, Edwards Sanborn E4 ranks #324 of 7,234 operating plants of the same technology nationally. It ranks #55 of 939 in CA.

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Batteries, Solar PhotovoltaicCAISO · Kern County

Edwards Sanborn E4

Terra-Gen Operating Co-Hybrid · Kern County · CAISO

Edwards Sanborn E4 is a hybrid solar and battery storage facility with 248.9 MW of EIA-reported operating capacity in Kern County, California, registered as EIA Plant ID 65675. Terra-Gen Operating Co-Hybrid is the registered plant entity or operator. Mortenson built the facility using Power Electronics HEM FS3430M equipment; public project records list 1 battery units. Commercial operation began in 2024.

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plant:plant-65675

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Investigate technology, capacity, output, price behavior, ownership, and related facilities using this profile plus current grid data.

Overview

Key fields

Reported capacity: 248.9 MW
EIA-reported operating capacity; nameplate, seasonal, AC/DC, and unit ratings may differ.
Technology: Solar + battery storage
Primary generation technology.
Registry anchor: Plant 65675
Terra-Gen Operating Co-Hybrid · Kern County · CAISO
Operating status: Operating
Edwards Sanborn E4 is operating.
Equipment: 1 battery units
Installed equipment documented in public project records.
Commercial operation: 2024
Best-supported operating milestone.

Profile

Grid role: Hybrid solar generation with DC-coupled battery storage that directly supports the PV unit and stores excess wind and solar generation.
Context: Edwards Sanborn E4 is an operational 248.9 MW solar-and-battery plant ranked #239 in the United States by capacity in the cited plant directory.
Physical build: Operational Edwards Solar 1B subproject E4, consisting of one 148.9 MW solar-photovoltaic generating unit and one 100 MW battery generating unit, for two generating units and 248.9 MW total nameplate capacity. The solar unit and the battery unit in November 2023; the BESS is identified as DC-coupled to the PV unit.
Portfolio financing: The Edwards Sanborn second phase was financed with $959 million of senior secured credit facilities, comprising a $460 million construction and term loan facility, a $403 million tax-equity bridge facility, and a separately identified $96 million construction facility whose full description is not stated in the available record.

Structured profile

Reported capacity: 248.9 MW
Batteries, Solar Photovoltaic
Commercial operation: 2024
Operating status: operating
Edwards Sanborn E4 is operating.
Location: Kern County
CAISO
Operator

Units and generators

Operating generator records and technology attributes reported through EIA-860.

Generator	Capacity	Technology	Operation	Status
BESS	100 MW 100 MW summer	Batteries Electricity used for energy storage · BA	Nov 2023	Operating
PV	148.9 MW 148.9 MW summer	Solar Photovoltaic Solar · PV	Dec 2022	Operating

Performance

Monthly EIA generation history and recent market-resource behavior where linked telemetry is available.

Peer context

Technology capacity: 148.9 MW
National rank: #324
CA rank: #55

Monthly generation

Download CSV

Latest 12 months

326.7 GWh

Reported net generation

Latest report

Apr 2026

EIA-923 monthly filing

2025 capacity factor

14.7%

Grid and market context

Deterministic links to ERCOT market resources, price records, outage disclosures, queue records, and nearby infrastructure. Candidate joins remain labeled until corroborated.

Nearby substations

HIFLD infrastructure inventory

UNKNOWN302355

NOT AVAILABLE · 66 kV

12.0 km

CORUM

Commercial, land, and environmental record

Source-backed project transactions, agreements, land records, permits, and environmental disclosures. Portfolio and adjacent-project facts remain explicitly scoped.

Land and environmental record

Land Acreage And Tenure - Parent Project Scope

More than 4,600 acres for broader Edwards & Sanborn project across private land and Edwards Air Force Base leased land

Edwards & Sanborn project spans more than 4,600 acres. Site located in Kern County on land leased from Edwards Air Force Base and adjacent private land. This is parent-project acreage, not E4-specific footprint.

Edwards Sanborn (Edsan) Solar Storage Phase 1A & 1B - Terra-Gen

Land Acreage And Tenure - Phase Scope

More than 2,400 acres for Edwards Sanborn Phase 1B containing Edwards Solar 1B

Phase 1B spans more than 2,400 acres in Kern County and contains 410 MWac solar and 1,786 MWh battery storage. E4 is one sub-project within this phase; phase-level acreage should not be attributed to E4 alone.

IJGlobal ESG Award – Hybrid Renewables, N America – Edwards Sanborn - Terra-Gen

Related Project Environmental Approval

Sep 13, 2022

Separate Sanborn 2.0 project approved on 31 parcels totaling approximately 1,200 acres

Kern County CEQA records describe Sanborn 2.0 (separate Sanborn Solar, LLC project) on 31 parcels totaling 1,200 acres, approved September 13, 2022 under CUP Nos. 60 and 61, Map 196. Should not be merged into E4 record absent explicit parcel linkage.

Sanborn 2.0 Solar Project by Sanborn Solar, LLC

Related Project Environmental Permits

Oct 13, 2025

Lahontan Regional Water Quality Control Board record R6T-2003-0004; streambed-alteration records EPIMS-KER-50847-R4, EPIMS-KER-30500-R4; CESA incidental-take permit 2081-2024-016-04

Lahontan assigns Sanborn Solar general board order R6T-2003-0004. CEQA records identify streambed-alteration permits and California Endangered Species Act incidental-take permit 2081-2024-016-04 for Sanborn/Enterprise-related work. they appear to cover broader Sanborn and Enterprise projects.

Lahontan Regional Water Quality Control Board

Related parties and identifiers

Parties, market resources, and identifiers tied to this asset, with owner, operator, developer, EPC, compliance provider, and interconnecting entity roles kept separate.

Relationship graph

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AssetOwner / operatorContractorEquipmentFinancierRelated asset

Timeline and sources

Project milestones and public references behind the asset profile.

Project timeline

Dec 2022
Dec 2022
Generator enters operationEIA-860
EIA-860 lists generator PV with this operating date.
Nov 2023
Nov 2023
Generator enters operation

Reporting portfolio

EIA reporting entity

Terra-Gen Operating Co-Hybrid

Entity 64366

Operating portfolio

10 plants

1 states

Reported capacity

1,606.8 MW

Batteries · Solar Photovoltaic

Largest reported plants in this portfolio
Largest reported plants	Capacity	State
Edwards Sanborn E1A	293.3 MW	CA
Edwards Sanborn E1B	290.4 MW	CA
Edwards Sanborn E2	257.8 MW	CA
Edwards Sanborn E4Current	248.9 MW	CA
Edwards Sanborn 1C	148 MW	CA
Edwards Sanborn E5	115 MW	CA
Edwards Sanborn S1	84.6 MW	CA
Edwards Sanborn S3	70.7 MW	CA

Portfolio membership follows the latest EIA-860 reporting entity. It does not imply ultimate ownership.

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Edwards Sanborn E4

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Edwards Sanborn E4

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Overview

Key fields

Profile

Structured profile

Units and generators

Performance

Peer context

Monthly generation

Grid and market context

Nearby substations

Commercial, land, and environmental record

Land and environmental record

Related parties and identifiers

Relationship graph

Timeline and sources

Project timeline

Parties and identifiers

Reporting portfolio

Sources

Common questions about Edwards Sanborn E4

How big is Edwards Sanborn E4?

What kind of plant is Edwards Sanborn E4?

Where is Edwards Sanborn E4 located?

Who operates Edwards Sanborn E4?

When did Edwards Sanborn E4 start operating?

How much electricity does Edwards Sanborn E4 generate?

How does Edwards Sanborn E4 compare to other plants?

Co-located assets

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