SEGS VIII — United States of America
Solar power plant in California, United States of America. Approximate location 35.0308, -117.3563.
SolarCaliforniaUnited States of AmericaSteam
SEGS VIII is a 92 MW solar power plant in California, United States of America. It is operated by Terra-Gen Operating Co-Solar. Based on reported annual generation of 138 GWh, it can supply roughly 39k homes. It ranks #2905 of 10,884 United States of America power plants by installed capacity. Commissioned in 1990, it is around 36 years old — long-established. As a non-combustion source, it has no direct CO₂ emissions from generation. In context, solar supplies about 8.6% of United States of America's electricity; the national grid averages 384 gCO₂/kWh (43.0% low-carbon) (2025).
Plant data: WRI Global Power Plant Database (CC BY 4.0), id USA0010444.
Data status
Known data
Calculated from dataset
Not available
Known, modelled and calculated values are kept separate. Missing fields are shown as unavailable.
Data provenance
Capacity and fuel are the upstream open-dataset record, not yet matched to a 2026 registry or GEM entry.
capacity: WRI GPPD; fuel: WRI GPPD
In context: how this plant compares
At 92 MW, SEGS VIII is well above the median solar plant in United States of America (3 MW). Technically it is described as Steam. Solar PV converts sunlight directly into electricity with no moving parts or fuel; output varies by time of day and weather, so it pairs with storage or flexible backup.
Capacity comparison computed from the WRI Global Power Plant Database; fuel-type context is general engineering background.
Key facts
- Load factor
- 17%, from 138 GWh of reported generation; the median for 3185 solar plants in United States of America that report generation is 19%
- Generation trend
- 158 GWh in 2013 and 138 GWh in 2019 (−13%)
- Highest and lowest year
- 2014: 159 GWh; 2019: 138 GWh
- Share of United States of America solar capacity
- 0.2% of 38,093 MW across 3,283 plants in this dataset
- Age among peers
- 5 of 3,277 dated solar plants in United States of America are older
Calculated from the capacity and generation records in this dataset (WRI Global Power Plant Database (CC BY 4.0)).
Reported generation trend
Annual generation (GWh), WRI Global Power Plant Database (CC BY 4.0).
Owner
Operated by Terra-Gen Operating Co-Solar.
Local climate & thermal context
This solar plant converts sunlight directly into electricity with photovoltaic panels. It sits in a cold desert climate (Köppen BWk) — Northern Hemisphere, latitude 35.0°N — which shapes how much energy it can produce and how its output varies through the year.
Monthly mean temperature
Heating degree-days here run 48% below the median power plant in this dataset — a proxy for how much extra energy heated equipment must replace through its surfaces in winter.
Climate heat-demand index: 30/100 — this site sits in the bottom third of the power plants we cover by heating degree-days.
Solar PV loses ~0.35%/°C above 25°C cell temperature — roughly 1.6% at warm-season highs here (estimate).
Climate normals: WorldClim 2.1 (1970–2000 monthly normals, 10 arc-min, CC BY 4.0); zone: Köppen-Geiger world climate classification (Kottek et al. 2006, 0.5° grid). Degree-days & heat-demand index computed by PowerAtlas — a modelled heat-demand proxy, not a measured site figure.
Site climate & environmental severity
This site sits in a benign, low-corrosion environment (estimated ISO 9223 class C1 — Very low), with dust abrasion the leading environmental stress.
Indicative estimate via the ISO 9223:2012 informative method (atmospheric corrosivity from temperature, time-of-wetness and airborne salinity), using WorldClim climate normals, the Köppen-Geiger class and coast distance. Indicative, not a measured corrosion rate.
How it compares & nearby plants
The #87 largest solar power plant of 3283 in United States of America by capacity.
United States of America has 3283 solar power plants in this dataset, together about 38,093 MW of capacity.
Nearby power plants
Location
Coordinates 35.0308, -117.3563 from WRI Global Power Plant Database (CC BY 4.0). View on OpenStreetMap.
Frequently asked questions
What type of power plant is SEGS VIII?
SEGS VIII is a 92 MW solar power plant in California, United States of America, commissioned in 1990.
How much electricity does SEGS VIII generate?
SEGS VIII generates about 138 GWh of electricity per year.
Who operates SEGS VIII?
SEGS VIII is operated by Terra-Gen Operating Co-Solar.