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Solar Electric Generating Station II

This page provides information on Solar Electric Generating Station II, a concentrating solar power (CSP) project, with data organized by background, participants, and power plant configuration. SEGS II 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: November 7, 2017
Photo with an aerial perspective looking perpendicular to numerous rows of parabolic troughs. In the far distance is the silhouette of mountains.
Project Overview
Project Name: Solar Electric Generating Station II (SEGS II)
Country: United States
Location: Daggett, California
(Mojave Desert)
Owner(s): Cogentrix (100%)
Technology: Parabolic trough
Turbine Capacity: Net: 30.0 MW Gross: 33.0 MW
Status: Currently Non-Operational
Start Year: 1985

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Technology: Parabolic trough
Status: Currently Non-Operational
Country: United States
City: Daggett
State: California
County: San Bernardino
Region: Mojave Desert
Lat/Long Location: 34°51′ 47.0″ North, 116°49′ 37.0″ West
Solar Resource: 2,725 kWh/m2/yr
Source of Solar Resource: National Solar Resource Data Base
Contact(s): Phillip Jones
Company: Cogentrix
Start Production: 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) (%): Cogentrix (100%)
Operator(s): Cogentrix
Generation Offtaker(s): Southern California Edison

Plant Configuration

Solar Field

Solar-Field Aperture Area: 190,338 m²
SCA Manufacturer (Model): Luz (LS-1)
SCA Description: Parabolic trough SCA
Solar-Field Outlet Temp: 316°C

Power Block

Turbine Capacity (Gross): 33.0 MW
Turbine Capacity (Net): 30.0 MW
Power Cycle Pressure: 40.0 bar
Turbine Efficiency: 29.4% @ full load
Fossil Backup Type: Natural gas