RE Tranquillity — Plant Summary
- EIA Plant ID
- 59939
- Capacity
- 277.3 MW
- Primary Fuel
- Solar
- Technology
- Batteries, Solar Photovoltaic
- Status
- Operating
- Location
- Fresno, CA
- Operating Since
- 2016
- Generators
- 3
- Operator
- Southern Power Co
- Parent Company
- —
- Annual Generation
- 491,435 MWh
- Capacity Factor
- 20.2%
- Balancing Authority
- California Independent System Operator
- ISO/RTO
- CAISO
- NERC Region
- WECC
RE Tranquillity
OperatingBESSSolarHybrid
Ranked #34 of 963 Solar plants in CA#166 of 7447 nationally
277.3 MW Batteries (72 MW) + Solar Photovoltaic (205 MW) operating in Fresno, CA — California Independent System Operator
EIAGEMWD
277.3 MW
Nameplate Capacity
3
Generators
units
Hybrid (2)
Technology
Batteries + Solar Photovoltaic
2016
Operating Since
Location
Coordinates
36.5814, -120.4045
County
Fresno, CA
Nearby Plants
- Luna ValleySolar200 MW · 1.2 km
- Great Valley Solar Portfolio Holdings, LSolar202.5 MW · 2.3 km
- Scarlet II HybridBESS350 MW · 3.6 km
Ownership & Operator
| Field | EIA | GEM | Wikidata |
|---|---|---|---|
| Operator | Southern Power Co | Southern Power | — |
| Owner(s) | RE Tranquillity LLC, SP Tranquillity Solar Storage, LLC | Canadian Solar [49%]; Southern Power Co [51%] | — |
| Status | Operating | operating | — |
Ownership Chain
GEM identifies the owner as Canadian Solar [49%]; Southern Power Co [51%]
This entity is not yet in the GEM ownership database — chain unavailable.
About
RE Tranquillity is a hybrid solar and battery energy storage system (BESS) located in Fresno County, California. The plant, operated by Southern Power Co, has a total capacity of 277.3 MW and commenced operations in 2016. It consists of three generators utilizing both solar photovoltaic and battery technologies. The BESS component has a storage capacity of 128 MWh, providing a duration of approximately 3.46 hours and employing lithium-ion battery (LIB) chemistry. The solar array uses single-axis tracking.
The plant operates within the California Independent System Operator (CAISO) balancing authority and the Western Electricity Coordinating Council (WECC) NERC region. RE Tranquillity's latest annual generation was 491,435 MWh, resulting in a capacity factor of 20.2%. The plant ranks as the 43rd largest in California out of 112 plants and 181st nationally out of 514. Financial data indicates a power purchase agreement (PPA) price of $49.83 per MWh.
Generated from EIA, GEM, and public data sources
Engineering & Generators
Grid Context
NERC Region
WECC
Balancing Authority
California Independent System Operator
Grid Voltage
230 kV
Regulatory Status
NR
Entity Type
Investor-Owned Utility
Sector
IPP Non-CHP
Generation
18.6K MWh
Latest Month
491.4K MWh
Annual Generation
20.2%
Capacity Factor
Jan 2022 – Dec 2024
Financial DataBeta
Source: LBNL Utility-Scale SolarHIGH
$56.1/MWh
LCOE (Levelized Cost)
$49.8/MWh
PPA Price
$-14.6/MWh
Energy Value
Pricing & Market Data
HIGH confidenceMarket Position
ISO/RTO Market
CAISO
LMP Node
Q1032C2_7_N001
Pricing Hub
TH_NP15_GEN-APND
Secondary Zone
TH_ZP26_GEN-APND
Location Type
Pricing Node
Node Source
Curated node match
News & Articles (10)Beta
Hazards·tornado
Fresno County CAL FIRE station finds temporary solution after roof destroyed by funnel cloud
Normal operations continue at Fresno County Fire Station 95 in Tranquillity after intense winds ripped off the roof on Monday.
Fresno County Fire Station 95 (other)
ABC30 Fresno·3 weeks ago
Hazards·tornado
Possible tornado tears roof off Fresno County CAL FIRE station
TRANQUILLITY, Calif. (KFSN) -- A rare weather report in Fresno County, as residents reported a potential tornado had ripped the roof off a...
Fresno County CAL FIRE (other)
ABC30 Fresno·4 weeks ago
Industry·technology
At the edges of the AI data center boom, rural America is up against Silicon Valley billions
But some of the biggest names in tech are suddenly very interested in what happens on this serene stretch of desert.
Fortune·2 months ago
Regulatory·permitting
Permits were expedited for this California clean energy project. Were residents sidelined?
Western Fresno County, home to poor migrant communities, is a test case as California expedites clean energy projects.
California (regulator)
Los Angeles Times·7 months ago
Last updated 2026-03-14
View all 10 articles