eSolar Sierra SunTower Project offline

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Mark Osborne
Mark Osborne
Mark Osborne is currently the Senior News Editor for Photovoltaics International and PV-Tech website. He has launched multiple technology titles in print and online covering manufacturing in the automotive, shipping, semiconductor and solar sectors in a publishing career spanning three decades. Mark started blogging in 2005, the first technology editor to do so and has worked online since 1996. A veteran manufacturing technology journalist and editor, Mark has been responsible for a series of innovative formats for delivering technical content to an engineering-based audience.

Partner blogger Ed Gunther from Gunther Portfolio has provided this blog.

A tale of two Concentrating Solar Power (CSP) Towers generating no electricity?

A funny thing happened on the way to Victorville for the Victor Valley College Solar Power Plant Celebration. I decided to stop in Lancaster, California, to benchmark the eSolar, Inc. CSP project I highlighted earlier this year. As can be seen in my photos over two days, one of the Sierra SunTowers is missing the thermal receiver enclosure nacelle, ample or not, and is out of operation. The second tower has an anemic amount of sunlight focused onto the thermal receiver by the heliostat field although it was late in the day.

When I was taking site photos from the public road next to the solar thermal power plant, a pickup truck left the main gate and stopped to talk. At first I thought my photo taking was going to be discouraged, but it appears to be a common occurrence. Short into our conversation, the driver said: “You should come back when it is lit up.” Prompted by the unseen passenger, the driver added something to the effect the plant had been “lit up” many times before. For example, please see the eSolar press photo below from the 5 MegaWatt (MW) solar plant commissioning in August 2009.



I was flabbergasted at the revelation. Unfamiliar with the technology, my initial suspicions were confirmed. eSolar has said the “Sierra SunTower is the only power tower facility currently operating in North America.” Well, it was not operating on the two consecutive days I visited the site last week. My impression via intuition was the site had been offline for an extended period.



My “In Search of” eSolar result was all the more surprising given “eSolar's Sierra SunTower Named Renewable Project of the Year” by Power Engineering and later received the same honor in the 2009 Excellence in Renewable Energy Awards from RenewableEnergyWorld.com, both PennWell publications.

eSolar Founder and Chairman Bill Gross (@bill_gross) likes to tout leveraging “Moore's law rather than more steel.” I guess Mr. Gross’ misapplication of Moore’s Law does not extend to thermal receivers, pumps, motors, condensers, and turbines?


2010 has been a great year for eSolar beginning with the announcement of a 2 GW (GigaWatt) licensing deal with Penglai Electric in China and the recent award of $10.8 million from the US Department of Energy for CSP baseload system research and deployment testing. However, earlier in May 2010, “PG&E, NRG Change Power Pact To Use Solar Panels, Not Thermal” by Cassandra Sweet for The Wall Street Journal reports on NRG Energy, Inc. (NYSE:NRG) plans to substitute 66 MW of photovoltaic (PV) solar for the prior 92 MW solar thermal contract with PG&E Corporation (NYSE:PCG) based on eSolar technology. The development is striking since NRG Energy is an investor in eSolar and correlates with my recent Sierra SunTower observations.

In the interest of transparency, I call on eSolar to apply basic IT (Information Technology) to dashboard real time operational status and electricity generation from the Sierra SunTower Project on their website. The Sierra SunTower Project points out why O&M (Operations and Maintenance), system uptime, and availability are crucial to reliable CSP generation.

For those looking to visit the site, the exact street address of the eSolar Sierra SunTower Project is 450 W. Ave. G, Lancaster CA 93534. The address has proven difficult to find via Internet search and is not visible yet on the Google maps satellite view.

eSolar has not yet responded to my observations or questions about the operational status of the Sierra SunTower Project although the request was acknowledged.

Of course, I find it ironic I am using Picasa to share my photos of eSolar’s CSP project.

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