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SEGS IX — Power plant · Gas, steam turbine · Terra-Gen Operating Co-SolarOvernight Solar — Under construction · Solar + storage · CA · 150 MW · 1.6 mi away
  • Combustion
  • Wind & solar
  • Under construction
  • Retired
  • 10 · 100 · 1,000 MW

SEGS IX

Power plant · Gas, steam turbine

Key facts

Power plant · Gas, steam turbineran 14% of 2023 Retired
Capacity
Capacity: sourceEIA-860M · Open licenseMW
Commissioned
1990
Net generation, 2023
109,177 MWh
Grid
220 kV to Southern California Edison Co (CISO)
Location
San Bernardino County, California

Output

Net generation MWh by year, 2001 to 2024
Fuel burned MMBtu by year, 2001 to 2024
  • Gas

Operations detail

Details

Who’s behind it

Owner
Terra-Gen Power LLC

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Technology
Gas, steam turbine source: “Natural Gas Steam Turbine”
Age
36 years since 1990
All 3 attributes from EIA-860M Preliminary Monthly Electric Generator Inventory
AttributeValue
Gem
Parents
Name
Mitsubishi UFJ Financial Group Inc
Share pct
50
Gem entity id
E100001016498
Name
Abu Dhabi National Energy Company PJSC
Share pct
16.60
Gem entity id
E100000001078
Name
Abu Dhabi National Oil Co
Share pct
16.60
Gem entity id
E100000001079
Name
Mubadala Investment Company PJSC
Share pct
16.60
Gem entity id
E100000001086
Unit ids
G100000409607
Location id
L100000407396
Eia plant ids
10446
EPA greenhouse gas reporting (GHGRP)
EPA FRS ID
110021007426
Subparts reported
C
NAICS code
221114
Subpart PP (CO2 supply)
No
Subpart RR (geologic sequestration)
No
Subpart UU (CO2 injection)
No
Reporting year
2023
GHGRP facility ID
1006175
Balancing authority codeCISO

Solar arrays

Array area (acres)
1,834.1
AC capacity (MW)
92
DC capacity (MW)
92
Mounting
Fixed tilt
Site type
Greenfield
Began operating
1990

Source USPVDB

Source

  • USPVDBOpen license · retrieved Oct 25, 2026Map services and data are available from Large-Scale Solar Photovoltaic Database, provided by the U.S. Geological Survey and Lawrence Berkeley National Laboratory via https://energy.usgs.gov/uspvdb

Attribution

Retirement

EIA-860M September 2026StatusEvery generator EIA lists at this plant has retired. As of EIA-860M for September 2026.
Retired
October 2024
Capacity retired
92 MW
Generators retired
1
GeneratorTechnologyNameplateStateDate
GEN1Natural Gas Steam Turbine92 MWRetiredOctober 2024

Grid

EIA-860 2025Grid fieldsAs the plant reported them to EIA-860 for 2025 (Schedule 2).
Grid voltage at the plant
220 kV
Transmission or distribution system owner
Southern California Edison Co
Balancing authority
California Independent System Operator
NERC region
WECC
Transmission lines within 15 mi (7)
Connection points within 15 mi (1)
Can the connection be reused?

A plant that retires usually leaves its substation, transmission connection and interconnection agreement behind, and those may be reusable by a new project at the same site. FERC Order No. 845 lets an interconnection customer use surplus interconnection service at an existing site, and some transmission providers' tariffs let a replacement resource take over a retiring unit's interconnection service, usually within a set time after the retirement. Whether any such right still exists here, who holds it and on what terms depends on the owner, the transmission provider and timing; this page does not establish any of that.

Ownership

2 companies2
CompanyRoleShareAs ofSource
Terra-Gen Operating Co-Solar Operator EIA-860M
TERRA-GEN POWER LLC Owner 100.0% Dec 31, 2023 EPA GHGRP

Timeline

  • Stated Unit GEN1 scheduled to retire, 92 MW · EIA-860M
  • In service · EIA-860M

Sources

8 sources

Sources EIA-860M · GEM · LBNL · CAISO · USPVDB · EIA · EIA-860M Preliminary Monthly Electric Generator Inventory · EPA Greenhouse Gas Reporting Program — facility register with parent-company shares (Envirofacts pub_dim_facility; FLIGHT)

Sources

  • EIA-860MOpen license · retrieved Nov 4, 2026
  • GEMOpen license, with credit · retrieved Oct 26, 2026Global Integrated Power Tracker, Global Energy Monitor, September 2026 release (https://globalenergymonitor.org/projects/global-integrated-power-tracker), CC BY 4.0. Modified by Inframation: TransitionZero-sourced rows removed; statuses and technologies mapped to Inframation's vocabulary; figures aggregated. Copyright © Global Energy Monitor. Global Integrated Power Tracker, September 2026 release. Distributed under a Creative Commons Attribution 4.0 International License.
  • LBNLOpen license, with credit · retrieved Nov 9, 2026Yin, Nait Belaid & Heleno (2026), Lawrence Berkeley National Laboratory, OEDI, CC BY 4.0: A Harmonized Geospatial Dataset of U.S. Transmission Lines: Linking FERC Form 1 and HIFLD, 1994-2024. Modified by Inframation: HIFLD-side fields only, names re-cased, coordinates rounded.
  • CAISOOpen license, with credit · retrieved Nov 12, 2026Source: California ISO
  • USPVDBOpen license · retrieved Oct 25, 2026Map services and data are available from Large-Scale Solar Photovoltaic Database, provided by the U.S. Geological Survey and Lawrence Berkeley National Laboratory via https://energy.usgs.gov/uspvdb
  • EIAOpen license · retrieved Nov 1, 2026Source: U.S. Energy Information Administration, Electricity bulk data (Form EIA-923 monthly plant series)
  • EIA-860M Preliminary Monthly Electric Generator Inventory
  • EPA Greenhouse Gas Reporting Program — facility register with parent-company shares (Envirofacts pub_dim_facility; FLIGHT)

Every source and license · Attribution

View at source

Around this plant

Nearby

within 15 mi
ProjectKindAwayMW
Overnight Solar Under construction Solar + storage 1.6 mi 150

Sources CAISO · EIA-860M

Sources

  • CAISOOpen license, with credit · retrieved Nov 12, 2026Source: California ISO
  • EIA-860MOpen license · retrieved Nov 4, 2026

Attribution