Solar Electric Generating Station I

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

SEGS I 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. Initially, the entire plant had three hours of thermal energy storage for dispatching electricity during periods of peak demand. However, a fire in 1999 damaged the storage system and it was not replaced.
Status Date

Background

Technology
Parabolic Trough
Status
Currently Non-Operational
Location

Daggett, CA
United States

County
San Bernardino
Region
Mojave Desert
Lat/Long Location
34°
51'
47.00"
North
116°
49'
37.00"
West
Solar Resource
2725 kWh/m2/yr
Source of Solar Resource
National Solar Resource Data Base
Start Production Date
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

Participants

Developer(s)
Luz
Operator(s)
Cogentrix
Generation Offtaker(s)
Southern California Edison

Plant Configuration

Solar Field

Solar-Field Aperture Area
82,960 m²
SCA Description 1
Parabolic trough SCA
SCA Manufacturer (Model)
Luz (LS-1)
Solar-Field Outlet Temp
307ºC

Power Block

Turbine Capacity (Gross)
13.8 MW
Turbine Capacity (Net)
13.8 MW
Power Cycle Pressure
40 bar
Turbine Efficiency
31.50% @ full load (Percentage)
Fossil Backup Type
None

Thermal Storage

Storage Type
2-tank direct
Storage Capacity
3 hour(s)
Storage Description
Storage system was damaged by fire in 1999 and was not replaced
Photo with a high aerial perspective of hundreds of rows of parabolic troughs, with separate sections offset slightly from one another. A main power plant is shown in the middle of the field of troughs. Agricultural fields in the background show circular irrigation patterns.

Project Overview

Project Name: Solar Electric Generating Station I (SEGS I)
Location: United States
(CA)
Location: Daggett (CA)
Owner(s) (%): Cogentrix (100%)
Technology: Parabolic Trough
Turbine Capacity (Net):
13.8 MW
Turbine Capacity (Gross):
13.8 MW
Status: Currently Non-Operational
Start Year: 1984

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