How big is RE Tranquillity?

RE Tranquillity has a reported capacity of 277.3 MW and an energy capacity of 288 MWh. That is roughly 4.3 hours at full output. Source: EIA Form 860.

What kind of plant is RE Tranquillity?

RE Tranquillity is a Batteries, Solar Photovoltaic facility in Fresno County, CA, participating in the CAISO market.

Where is RE Tranquillity located?

RE Tranquillity is in Fresno County, CA, inside the CAISO balancing area.

Who operates RE Tranquillity?

RE Tranquillity is operated by Southern Power Co according to the EIA generator inventory. Reporting membership does not by itself establish ultimate ownership.

How much electricity does RE Tranquillity generate?

RE Tranquillity reported 491.4 GWh over the twelve months to 2024-12. Figures are net generation as filed to EIA-923.

Where does RE Tranquillity connect to the grid?

RE Tranquillity interconnects at Tranquillity Switching Station, on the Pacific Gas and Electric Company (PG&E) system.

How does RE Tranquillity compare to other plants?

By capacity, RE Tranquillity ranks #133 of 7,234 operating plants of the same technology nationally. It ranks #25 of 939 in CA.

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Batteries, Solar PhotovoltaicCAISO · Fresno County

RE Tranquillity

Southern Power · Fresno County · CAISO

RE Tranquillity is a hybrid solar and battery storage facility with 277.3 MW of EIA-reported nameplate capacity and 288 MWh of reported storage energy capacity in Fresno County, California, registered as EIA Plant ID 59939. Southern Power owns and operates the plant. in August 2015.

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Overview

Key fields

Generation / storage: 277.3 MW total / 288 MWh storage
Reported plant capacity and configuration.
Technology: Solar + battery storage
Primary generation technology.
Registry anchor: Plant 59939
Southern Power Co · Fresno County · CAISO
Storage duration: 4.3 hours

Asset analyst

plant:plant-59939

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

Units and generators

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

Generator	Capacity	Technology	Operation	Status
BESS1	37 MW 37 MW summer	Batteries Electricity used for energy storage · BA	Nov 2021	Operating
BESS2	35 MW 35 MW summer	Batteries Electricity used for energy storage · BA	Mar 2022	Operating
TQ	205.3 MW 200 MW summer	Solar Photovoltaic Solar · PV	Jul 2016	Operating

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

Battery Storage Environmental Component

2021

72 MW / 288 MWh lithium-ion battery energy storage addition

Southern Power's official storage fact sheet describes a lithium-ion battery-based storage addition at Tranquillity in Fresno County with 72 MW capacity and 288 MWh energy capacity. Southern Power operates the storage project.

Source

Conditional Use Permits

Oct 9, 2014

CUPs 3451 through 3458; EIR 6330

Fresno County Planning Commission approved conditional use permits 3451-3458 for the Tranquillity Solar project on October 9, 2014, linked to environmental review EIR 6330.

Photovoltaic Solar & Energy Storage Projects Submitted to Fresno County

Environmental Review

Sep 10, 2014

SCH 2013111056; Fresno County Tranquillity Solar Generating Facility EIR; Final Document received September 10, 2014

Fresno County was the CEQA lead agency. The final environmental impact review was received September 10, 2014, covering construction, operation, maintenance, and decommissioning of the photovoltaic facility.

Tranquillity Solar Generating Facility EIR

Land Use Zoning

Sep 10, 2014

Exclusive Agriculture (AE-20); 20-acre minimum parcel size

CEQA environmental review identifies the site's present land use as General Plan Agriculture, Exclusive Agriculture zoning, with a 20-acre minimum parcel size requirement.

Tranquillity Solar Generating Facility EIR

Operating Facility Land Area

Sep 26, 2016

1,900 acres

Southern Power and Recurrent Energy state the operating Tranquillity Solar Facility was constructed on 1,900 acres in Fresno County. This is distinct from the 3,732-acre permitted project footprint.

Source

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.

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AssetOwner / operatorProject companyFinancierContractorEquipmentOfftaker

Parties and identifiers

OrganizationRoleBasis

Southern PowerOperatorin August 2015.

AIP ManagementOwner / developerOwner / developer associated with RE Tranquillity.

Reporting portfolio

EIA reporting entity

Southern Power Co

Entity 17650

Operating portfolio

53 plants

14 states

Reported capacity

13,517.8 MW

Batteries · Natural Gas Fired Combined Cycle · Natural Gas Fired Combustion Turbine

Largest reported plants in this portfolio
Largest reported plants	Capacity	State
H Allen Franklin Combined Cycle	1,995.7 MW	AL
E B Harris Electric Generating Plant	1,304 MW	AL
Wansley Combined Cycle	1,239 MW	GA
Rowan	1,192 MW	NC
Dahlberg	919 MW	GA
Cleveland Cnty Generating Facility

Overview

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Overview

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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

Parties and identifiers

Reporting portfolio

Timeline and sources

Project timeline

Sources

Common questions about RE Tranquillity

How big is RE Tranquillity?

What kind of plant is RE Tranquillity?

Where is RE Tranquillity located?

Who operates RE Tranquillity?

How much electricity does RE Tranquillity generate?

Where does RE Tranquillity connect to the grid?

How does RE Tranquillity compare to other plants?

Co-located assets

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