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Solar Electric Generating Station III

This page provides information on Solar Electric Generating Station III, a concentrating solar power (CSP) project, with data organized by background, participants, and power plant configuration. SEGS III 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.

Status Date: October 1, 2015
Photo with low aerial perspective of parabolic troughs focusing on the sun at a high angle overhead. The tubes making up the heat-collection element along the focal line of each trough are prominent. Two men wearing hard hats are standing near the edge of one trough, with the edge just above the height of their heads.
Project Overview
Project Name: Solar Electric Generating Station III (SEGS III)
Country: United States
Location: Kramer Junction, California
(Mojave Desert)
Owner(s): NextEra (50%)
Technology: Parabolic trough
Turbine Capacity: Net: 30.0 MW Gross: 33.0 MW
Status: Operational
Start Year: 1985

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Technology: Parabolic trough
Status: Operational
Country: United States
City: Kramer Junction
State: California
County: San Bernardino
Region: Mojave Desert
Lat/Long Location: 35°0′ 51.0″ North, 117°33′ 32.0″ 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 31, 1985
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: 230,300 m²
SCA Manufacturer (Model): Luz (LS-2)
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: 349°C

Power Block

Turbine Capacity (Gross): 33.0 MW
Turbine Capacity (Net): 30.0 MW
Power Cycle Pressure: 40.0 bar
Turbine Efficiency: 30.6% @ full load
Fossil Backup Type: Natural gas