Skip to main content

Solar Electric Generating Station IX

This page provides information on Solar Electric Generating Station IX, a concentrating solar power (CSP) project, with data organized by background, participants, and power plant configuration. SEGS IX is one of the nine Solar Electric Generating Station plants in California’s Mojave Desert. The combined electric generating capacity of these plants, which use parabolic trough technology, is more than 350 megawatts. The plants operate as Qualifying Facility Independent Power Producers under the Public Utility Regulatory Policies Act, with a special Standard Offer 2 type of power purchase agreement to Southern California Edison. SEGS IX is the largest individual trough plant (along with SEGS VIII).

Status Date: October 1, 2015
Photo in black and white at low aerial perspective that shows portions of several large parabolic troughs. Images of the tubes of the heat-collection elements and their supports are reflected into the trough mirrors. A man with a hard hat is looking up at a trough as he stands at the end of one row.
Project Overview
Project Name: Solar Electric Generating Station IX (SEGS IX)
Country: United States
Location: Harper Dry Lake, California
(Mojave Desert)
Owner(s): NextEra (50%)
Technology: Parabolic trough
Turbine Capacity: Net: 80.0 MW Gross: 89.0 MW
Status: Operational
Start Year: 1990

Do you have more information, corrections, or comments?


Technology: Parabolic trough
Status: Operational
Country: United States
City: Harper Dry Lake
State: California
County: San Bernardino
Region: Mojave Desert
Lat/Long Location: 35°1′ 54.0″ North, 117°20′ 53.0″ West
Solar Resource: 2,725 kWh/m2/yr
Source of Solar Resource: National Solar Resource Data Base
Contact(s): Lauren Romero
Company: NextEra Energy
Start Production: October 1, 1990
Project Type: PURPA Qualifying Facility Independent Power Producer, with special Standard Offer 2 (SO-2) type power purchase agreement to Southern California Edison
Incentives: Accelerated depreciation
Federal and state investment incentive
Solar property tax exclusion


Developer(s): Luz
Owner(s) (%): NextEra (50%)
Operator(s): NextEra
Generation Offtaker(s): Southern California Edison

Plant Configuration

Solar Field

Solar-Field Aperture Area: 483,960 m²
SCA Manufacturer (Model): Luz (LS-3)
SCA Description: Parabolic trough SCA
HCE Manufacturer (Model): Solel Solar Systems (Solel UVAC)
HCE Type (Length): Evacuated (4 m)
Heat-Transfer Fluid Type: Therminol
Solar-Field Outlet Temp: 390°C

Power Block

Turbine Capacity (Gross): 89.0 MW
Turbine Capacity (Net): 80.0 MW
Power Cycle Pressure: 100.0 bar
Turbine Efficiency: 37.6% @ full load
Fossil Backup Type: Natural gas