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Solar Electric Generating Station VIII

This page provides information on Solar Electric Generating Station VIII, a concentrating solar power (CSP) project, with data organized by background, participants, and power plant configuration. SEGS VIII 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 VIII is the largest individual trough plant (along with SEGS IX).

Status Date: October 1, 2015
Photo of the backside of rows of parabolic troughs. Fourteen metal frames hold the curved mirrors to form an entire trough; vertical supports are positioned on the ends of each trough. The troughs cast shadows on the ground below.
Project Overview
Project Name: Solar Electric Generating Station VIII (SEGS VIII)
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: 1989

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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: December 1, 1989
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: 464,340 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