First M-8 Tracker Installed

REhnu installs its first 8-mirror solar tracker at the Green Valley Pecan Company in Arizona.

REhnu engineers Andy Whiteside (left) and Tom Stalcup with the M-8 tracker


Custom Mirror-Shaping Moves Forward

Under contract to SRI International, REhnu is developing a system to make glass reflectors of different shapes from the same mold, using computer commands to change the mold shape. REhnu is now building a full-scale version, following the successful demonstration of a prototype mold and furnace, shown here. The new computer-controlled mold will be available to fabricate solar collectors of customer-specified shape and size up to 1.65m x 1.65m.

Mira Frenkel helped build and test the prototype system.

Mira Frenkel helped build and test the prototype system.


REhnu’s Founder Receives National Honor for Inventions

Roger Angel, REhnu’s Founder and Chief Technology Officer, will be inducted into the National Inventors Hall of Fame in a ceremony next May.

The National Inventors Hall of Fame UA's Roger Angel Inducted Into Inventors Hall of Fame


New M-2 Installations


M-2 unit at Plataforma Solar de Hermosillo

REhnu has installed two M-2 units. One is at the Plataforma Solar de Hermosillo, in collaboration with University of Sonora, Mexico; the other is in Tucson. A third M-2 system is approaching completion at REhnu’s Tucson headquarters.


REhnu moves into new headquarters

The 6000-square-foot facility, located near Tucson International Airport, houses REhnu’s R&D, manufacturing and testing.

REhnu HQ less glowing

REhnu’s new headquarters


Tracker delivery


Completion of first commercial M-8 dual-axis tracker


Jose Alfredo Soto of SOGO (left) and Andy Whiteside of REhnu with the tracker.

REhnu’s first commercial M-8 tracker, built by Grupo SOGO in Hermosillo, Mexico, has passed mechanical performance testing and will now be shipped to Tucson for installation of mirrors and power converter units.


New Contract with SRI International

On March 25, 2015, REhnu signed a two-phase, ~ $1.5M contract with SRI International, a research and innovation center headquartered in Menlo Park, California, to develop a computer-controlled mold system that would permit easy adaptation of REhnu’s patented mirror-shaping technology to produce different reflector shapes through computer commands. Click here for more details.


REhnu supplies solar mirrors and tracker to the University of Sonora 

REhnu delivered 10 mirrors and a 2-module tracker to the University of Sonora in Hermosillo, Mexico.

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Completed dish mirrors, ready for installation.

M-2 dual-axis tracker in Tucson, prior to shipment
to Hermosillo.


REhnu completes initial on-sun tests for commercial mirror modules

2-module prototype in operation.

2-module prototype in operation.

Two of REhnu’s commercial mirror modules have undergone extensive testing on a fully automated dual-axis tracker, accumulating 500 hours of on-sun data and demonstrating 31% end-to-end conversion efficiency. Reliability testing and verification is continuing.


Construction of commercial M-8 units begins

Construction of 8-module steel trackers

Construction of 8-module steel trackers.

SOGO, a steel fabrication company in Hermosillo, started construction of REhnu 8-module trackers.


REhnu completes DOE Incubator program, demonstrates
31% system efficiency 

REhnu completed its $1 million DOE SunShot Incubator program and delivered its final report. Operated in a mirror module, the production-ready power converter unit (PCU) built under this program demonstrated an end-to-end conversion efficiency of 31%.

Assembled PCU ready for installation

Assembled PCU ready for installation.

PCU fully illuminated and in operation

PCU fully illuminated and in operation.


World’s most accurate glass solar reflectors made by REhnu

A technical report published by SciTech Connect describes mirrors made by REhnu—using a gravity sag facility and method developed at the University of Arizona with a SunShot Award—as exceeding by a factor of two the current accuracy for standard solar trough reflectors, which are made of glass of the same size and thickness.

Left pair: x and y slope maps for a 1.65 m x 1.65 m square replica from the REhnu mold, rms slopes 0.65 mrad. Right: Map of absolute slope, 0.89 mrad rms

Left pair: x and y slope maps for a 1.65 m x 1.65 m square replica from the REhnu mold, rms slopes 0.65 mrad. Right: Map of absolute slope, 0.89 mrad rms.


EPRI affirms REhnu’s potential to lower capital cost

The Electric Power Research Institute, published a briefing on REhnu’s technology that concludes: “This combination of technology advancements could enable increased efficiencies and better reliability at lower capital cost than competing PV and CPV products.”