Ultimate Trough Testloop

A complete loop, consisting of two solar collector assemblies (SCAs) of 240 m length each, has been integrated in a plant in California. One collector assembly consists of 10 solar collector elements (SCEs). The aim of the project is to achieve a reliable basis of the fabrication and erection concepts and their respective costs. In addition the collector efficiency will be measured under working conditions to provide certainty for the design of upcoming solar thermal power plants.

Concentrating Solar Power,
Harper Lake, California, USA
Fraunhofer Institute for Material Flow and Logistics (IML), Aeronautics and space research centre of Germany (DLR)
Flabeg Holding GmbH, sbp sonne gmbh
Markus Balz


Technical Data

Aperture width
7.5 m
SCE length
24 m
SCEs per SCA
Loop length
480 m
Aperture area
3,600 m²
Global distribution right
schlaich bergermann partner


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Our product used in this project

Parabolic Troughs

Proven state of the art for CSP

Over the years, sbp sonne developed and licensed three different types of parabolic trough collectors: the EuroTrough, the HelioTrough and the UltimateTrough. We are now focusing on the distribution and commercialization of the ‘HelioTrough’ and ‘UltimateTrough’, as these collector developments have been proven to significantly reduce costs and improve performance for large scale power plants.

The UltimateTrough collector for Concentrating Solar Power (CSP) plants is the world’s largest and most advanced parabolic trough collector. Measurements indicate that efficiency of the UltimateTrough is over 10% higher as compared to the benchmark collector.

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