10 Questions for eSolar's CEO Asif Ansari


eSolar is one of a dozen startups that are looking to build solar thermal plants in the deserts of California. While the company says it’s using the lessons of infotech — computing and algorithms — to make low cost modular solar, we were wondering what really makes eSolar stand out? The company has certainly gotten a lot of attention — receiving at least $130 million from Google.org, Bill Gross’ Idealab, and other investors, and inking a deal with California utility Southern California Edison for a 245 MW solar thermal power plant. We thought we’d check in with eSolar’s CEO Asif Ansari and see what all the fuss is about.

1). There’s about a dozen other companies building solar thermal plants in the desert, why will eSolar be a leader in this area?

eSolar is producing easily scalable and rapidly deployed concentrating solar power plants and we’ve brought the minimum economic size of our power plants down to just 33 MW. We build power plants in these 33 MW modules, and replicate the number of modules depending on the size of plant a utility needs, so it’s just as easy for us to build a 33 MW plant for a smaller utility as it is to build a 245 MW or larger plant for a huge utility like Southern California Edison.

This uniform modularity makes it easier for any sized utility to incorporate concentrating solar thermal power into the grid. It also substantially increases the addressable market in developing countries. Most other companies in the United States right now are only building huge power plants, even though companies such as Acciona and Abengoa are also following the trend toward the smaller, mid-sized utility-scale plant in projects in Spain.

2). eSolar has said its replacing “expensive steel, concrete and brute force with inexpensive computing power and elegant algorithms.” Can you elaborate on lessons learned from the Internet and IT worlds?

We learned that leveraging computing power and developing algorithms can be a very smart way to address big challenges. Rather than relying on large curved mirrors and tons and tons of steel to efficiently concentrate sunlight, eSolar is trying a different approach that leverages Moore’s Law. eSolar is making solar electric plants using an array of thousands of smaller flat mirrors – one meter square in size. High-powered software dynamically tracks the mirrors to perfectly catch the sun and reflect it to a collecting tower creating a perfect, continual concentration system.

3). Are the company’s power plants less expensive to build than competitors, and do you have a data point to explain the cost difference to the competition?

We are confident we can drive down costs due to our prefabricated, easily transported and modular design; the on-site assembly, lack of heavy machinery required to assemble our power plants; and the fact that we use fewer materials in construction. All these things translate into reduced construction times and costs.

4). What is the reasoning for using smaller heliostats? Why is this cost effective or a better solution?

Our heliostats are about one square meter in size—human sized, when you think that many other companies are using heliostats that are up to 100 square meters. There are some distinct advantages to the less is more approach. Because our heliostats are made of small, simple, prefabricated parts, they can be shipped and assembled more quickly and at a lower cost. Our heliostats avoid on-site precision-engineering—a task that is costly, involves highly specialized laborers and equipment and overall slows down the time it takes to get a solar power plant online.

Additionally, we use fewer materials in construction, since our heliostats are low to the ground—we don’t need all the steel and concrete that is used to anchor systems.

5). Given the company was one of Google’s first solar investments for its cleantech fund plans, how did the company get connected with Google?

Google.org made an investment in eSolar as part of its RE less than C campaign, which is its initiative to develop electricity from renewable sources cheaper than the electricity produced from coal.

6). The $130 million last investment raised won’t cover the cost of the construction of several solar thermal power plants. Is the company raising more funding? And in what form? (VC, project financing, etc.)

This is an exciting field with immense growth potential—we can’t preclude the possibility of further funding, both from private equity and project finance.

7). Can you talk about the company’s other planned plants and locations where the company has “secured land rights” in the southwestern U.S. to produce over 1 GW of power?

We are currently in ongoing discussions with major utilities in the American Southwest. We recently announced a 245 MW deal with Southern California Edison that will be producing power by 2011, fully operational by 2013 and built in the desert in Antelope Valley. Our modular design fits into a one-quarter square mile plot, which offers us many more options close to power lines, and we’ve secured land in sunny areas scattered across the southwest.

8). Many solar thermal companies are seeking loan guarantees to build these solar power plants — is eSolar seeking DOE loan guarantees?

We can’t comment on that at this time.

9). The federal government might not renew the federal tax credits for solar — what is the company’s plan if these are not renewed?

We are building a sustainable, global business which cannot depend upon subsidies which are clearly not sustainable, so our goal from the get go has been to continue to be cost-competitive in the U.S. as these subsidies are phased out.

10). What are the biggest hurdles for starting construction on these plants? Transmission lines? Permitting?

Both of those issues—transmission lines and permitting—are serious obstacles that have to be overcome before construction can even start. Because eSolar uses significantly less land for its plants than other companies—we use about one quarter of a square mile for each 33 MW plant and a traditional CSP plant uses 2.5 square miles—we are less constrained by those hurdles. There are literally thousands of these smaller sites scattered across the southwestern United States, and many of them are adjacent to current transmission lines.

So that solves another problem—transmission lines and integrating these power plants into the grid. We basically are able to get these plants deployed faster than anyone else, since we have preemptively addressed the problems facing larger power plants.



Dear Mr. Ansari,

At first look it appeared to me that esolar has got the solution to replace fossil fuel world wide but only if you have taken care of question as under:-

• Do you have thermal storage arrangement so that the plant can work round the clock as it works in case of fossil fuel?
• If you say that the generated energy cost per KWh is coming less by using your CSP technology than fossil fuel fired station without any thermal storage system then I am sure your system PLF will go much higher by adding thermal storage system & hence further reduction in per unit of energy generation.
• What is your system PLF?
• You said that you use normal TG but normal TGs are not supposed to be shutdown every evening? If yes then you must be wasting lot of thermal energy every morning in re-starting your TG.
• What happens when there is no sun for few minutes (30-45) still your TG generates with same efficiency or you face some problem?

I feel that your initiatives are highly remarkable; this world really needs such bold steps to brake down the trends of fossil fuel dependency but I can see a path block for you in near future.

You must design a molten salt based thermal energy storage system. Molten salt will flow through all thermal receivers (no water) making system much more efficient & reliable.

I have been trained to handle molten salt thermal storage system in Europe & working on CSP project as project head in India. Unable to bring down per unit energy cost (US $ 0.30) at system PLF of about 60% even we are ready to fabricate all most all the plant components in India to bring down the cost. The CSP project site is in India with more than 6.4KW/m2/day of solar isolation.

Sr. Vice President
Mob: +91-9810005877.


eSolar applied for a Conditional Use Permit (No. 2008000280) for a location in the Antelope Valley at 10250 E Ave “T”. The north side of Ave “T”, directly across the street, is already developed with existing homes.

Sanjay Verma

It is necessory to know the cost of the project per mega watt ,without including the cost of the land.

And the efficiency of the project too.

At the same time i have a question in my mind that how we can run the project at night and other cloudy days ?


Good. What about storage. how many hours the plant can be operated and at what plant load factor.
How much energy can be generated per MW/Year.

solar dude

Almost all of the sites are being developed in Antelope Valley and the greater lancaster area. The planned sites are located in rural areas far from homes and most are actually on purchased land that was either used for farming or agricultural work.

Mike Suppe

I would like to know what type of impact your plants have on nearby homes. I understand some of your planned locations will be across the street from current homes and want to know what those home owners can expect during both the installation phase and the operation of the plant.

Jeff Kuper

Katie and Craig,

First of all, thanks for all the content and links that you provide. Secondly, could you post your thoughts on this potential breakthrough for CSP and do a follow-up with Ansari, the boys at Ausra or Stirling Energy Systems?

The way I interpret this article as it relates to solar thermal electricity generation is that you could reduce the mirrors (numbers or size) by approximately 97 percent to produce the same amount of steam power since the energy to boil water is 30 times less using this nanotechnology. If true (or even if real world application is only half of what is advertised) this could further radically alter the project costs for solar thermal and could make them achieve grid parity RIGHT NOW. Pretty damn exciting but I want to hear from the experts that are actually involved with the industry to see if this technology is practical to use in CSP.

Please let me know your thoughts. Here’s the link:


Deep Patel

Its great to see the response to question #9, the federal tax credit is expiring and has many industry people worried. Although it seems like eSolar is going to move forward in the US market even without the tax credits. This is a great example of a free market….we really need clean energy to compete without subsidies, if we can achieve this through innovation, not even big oil can stop the clean energy revolution.

What upsets me the most in particular is that the US energy policy favors big oil, congress subsidizes billions of dollars a year to big oil…and want to remove the modest subsidies given to clean energy.

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