Centennial Flats — 511 MW hybrid plant, La Paz County, AZ

Centennial Flats — 511 MW hybrid plant, La Paz County, AZ · Ask the Grid

Generation and physical site

EIA plant 68466 · Inventory for Aug 2026.

Reported operating nameplate by technology

Battery storage: 178 MW
Solar: 333.4 MW

Operating generators only. Battery power is in MW; stored energy is in MWh. These ratings do not establish a shared export limit.

Generator records (6)

EIA generator status and nameplate capacity for Centennial Flats
Generator	Technology	Status	Power (MW)	Energy (MWh)
CFB1	Batteries	Operating	89	89
CFB2	Batteries	Operating	89	89
CFPV1	Solar Photovoltaic	Operating	166.7	Unknown
CFPV2	Solar Photovoltaic	Operating	166.7	Unknown
CFB3	Batteries	Under construction	89	Unknown
CFPV3	Solar Photovoltaic	Under construction	166.7	Unknown

Physical map location · OpenStreetMap: 33.55518, -113.48683
Filed location · EIA: 33.58833, -113.52830

Sources and observation dates

Inventory source: EIA-860M workbook (preliminary)
EIA reporting month: Aug 2026
EIA retrieved: Oct 10, 2026
OSM extract: Oct 8, 2026
OSM last mapped edit: Sep 18, 2026
Map prepared: Oct 10, 2026
Field verification: Not reported

Reporting month describes the inventory. Retrieval and map preparation describe processing; an OSM edit does not establish an in-service date.

EIA source inventory

Units and generators

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

Generator	Capacity	Technology	Operation	Status
CFB1	89 MW 89 MW summer	Batteries Electricity used for energy storage · BA	Jun 2026	Operating
CFB2	89 MW 89 MW summer	Batteries BA	Jul 2026	Operating
CFPV1	166.7 MW 166.7 MW summer	Solar Photovoltaic Solar · PV	Jun 2026	Operating
CFPV2	166.7 MW 166.7 MW summer	Solar Photovoltaic PV	Jul 2026	Operating

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 / operatorProject companyFinancierOrganization

Parties and identifiers

OrganizationRoleBasis

Copia PowerOwner / operator / developer / sponsor / acquirerowner

CarlyleParent company / investorparent

Upstream HC-1 LLC

Reporting portfolio

EIA reporting entity

Copia Power

Entity 66217

Operating portfolio

3 plants

1 states

Reported capacity

1,261.4 MW

Batteries · Solar Photovoltaic

Largest reported plants in this portfolio
Largest reported plants	Capacity	State
Harquahala 2	600 MW	AZ
Centennial FlatsCurrent	511.4 MW	AZ
Harquahala Sun Solar Project	150 MW	AZ

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

View full reporting portfolio

Timeline and sources

Project milestones and public references behind the asset profile.

Project timeline

2022
2022
Copia Power acquires Centennial Flatseolus.com
Purchased from Eolus.
Nov 19, 2024
Nov 19, 2024
$1.24 billion construction financingcopiapower....
Debt facility for construction.
Dec 17, 2025
Dec 17, 2025
$595 million tax equity commitmentcopiapower....
J.P. Morgan sole tax equity investor.
Jun 2026
Jun 2026
Generators enter operationEIA-860
EIA-860 lists generator CFB1, generator CFPV1 with this operating date.
Jul 2026
Jul 2026
Generators enter operationEIA-860
EIA-860 lists generator CFB2, generator CFPV2 with this operating date.

Sources

PublisherReferenceType

U.S. Energy Information AdministrationEIA-860 generator inventoryFederal registry

U.S. Energy Information AdministrationEIA-923 generation filingsFederal filing

centennialflats.comcentennialflats.compublic_source

Common questions about Centennial Flats

Answered from the published record above. Questions whose inputs this profile does not carry are omitted rather than estimated.

How big is Centennial Flats?

Centennial Flats reports 178 MW battery storage + 333.4 MW solar of operating nameplate capacity. These technology ratings do not establish a common export limit. Source: EIA Aug 2026.

What kind of plant is Centennial Flats?

Centennial Flats is a Batteries, Solar Photovoltaic facility in La Paz County, AZ, participating in the CAISO market.

Where is Centennial Flats located?

Centennial Flats is in La Paz County, AZ, inside the CAISO balancing area.

Who operates Centennial Flats?

Centennial Flats is operated by Copia Power according to the EIA generator inventory. Reporting membership does not by itself establish ultimate ownership.

How much electricity does Centennial Flats generate?

Centennial Flats reported 107.3 GWh over the twelve months to 2026-07. Figures are net generation as filed to EIA-923.

How does Centennial Flats compare to other plants?

By capacity, Centennial Flats ranks #29 of 7,597 operating plants of the same technology nationally. It ranks #4 of 126 in AZ.

Co-located assets

Plants within 25 km, nearest first, regardless of technology. Proximity is straight-line distance between mapped plant coordinates; it does not by itself establish a shared point of interconnection.

ATLAS Solar V, LLCSolar PhotovoltaicSolar Photovoltaic200 MW8.6 km Atlas VIIBatteriesBatteries300 MW8.9 km Atlas IXBatteriesBatteries150 MW8.9 km

Overview

Infrastructure record

Overview

Infrastructure record

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Structured profile

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Reported operating nameplate by technology

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Performance

Peer context

Monthly generation

Grid and market context

Market registration

Nearby substations

Commercial, land, and environmental record

Transactions and agreements