Solar Farm Site Selection

I was putting this list together for a presentation that I’m giving next week, and I thought I would post it here too.  These factors are true for any technology, but they’re part of the reason I like our technology – high efficiency modules on sun trackers really make many of these issues more manageable.

Solar Farm

Don’t take this all to mean that there aren’t any sites out there for solar farm development – there are thousands of sites available – these considerations really just emphasize the fact that even if you’re out in the desert, it’s a mistake to treat land as essentially free.  This just stresses the need for efficient use of land for solar farms.

Below are some of the issues that a solar farm developer needs to consider when selecting a site.

Quality of terrain
Sloped land, excessively rocky or sandy terrain, uneven land etc can all significantly add to the cost of installing a solar farm.

Local weathering factors
Desert conditions often coincide with excessive dust fall, flooding and flash flooding, high erosion etc, and these can limit the viability of a site and in many cases can make a site non-viable.

Proximity to High Transmission Capacity Lines
One of the biggest hidden costs of a solar farm is the distance required to connect a system to high voltage lines capable of carrying the excess production.  The costs of even a few extra kilometres can completely destroy the profitability of a solar farm.

Local Transmission Capacity
Worse, in many places, power grids are not able to handle the excess capacity that a solar farm would introduce.  This has been a persistent problem in California, Spain, Ontario and the Middle East, and has led to hundreds of projects being cancelled or delayed indefinitely.

Conservation and Environmental Impact Issues
Large tracts of undeveloped land too often coincide with sensitive or protected areas or protected species.  Often the presence of a single protected species of plant or animal can halt or completely alter the development plans for a solar farm, and for example in California, the evidence of single endangered burrowing owl halted the development of a solar farm project worth hundreds of millions.  Thin films are especially bad as they really require the land to be completely covered to get a useful watts/acre ratio.

Agricultural Concerns
Most government agencies responsible for agriculture do not want to see farmers paving over their fields with solar panels.  Especially in Canada and Southern Europe, available land near electrical demand centres is usually agricultural land – this will turn into a bigger and bigger issue as time goes on.

Local Regulations and Ownership
It is surprising the number of issues that can arise, even in a friendly regulatory framework.  Objections from the military over concerns with reflections interfering with pilot’s vision or ground construction causing problems with radar installations, construction permits and agricultural land limits on depth of holes allowed on a site are examples of regulations that can effect a site.  This has been a consistent issue with site selection for solar farms everywhere.  Further, although this depends on local factors, land ownership of the solar farm land itself, or the right of way required for construction access and/or connection to high voltage transmission can severely complicate factors, especially when previously “worthless” land is suddenly perceived as valuable.

Land Prices Rise Quickly
Generally, solar farm developments tend to happen regionally, where several projects appear in quick succession.  The surprising limits to viable sites discussed above, combined with the high costs of developing solar farms tends to lead to higher land prices, higher property taxes and in worst cases, land speculation.

Smaller Solar Farms Save other Costs
Panel and land costs are not the only costs to consider – installation costs, cabling and O&M are all less costly in smaller solar farms.  As the scale gets bigger, this becomes more significant.

That’s a sample, trust me – talk to a solar farm developer and they’ll laugh at how oversimplified this list is.  That said, there are hundreds, perhaps thousands, of solar farms in the works all over the world.  Efficiency matters.  That’s all I’m saying.

Calling Ontario Solar

If you’re in Ontario and:

• You’re part of a solar energy company, advocacy or industry group, or your company is interested in solar.
• You’re interested in developing a Renewable Energy Standard Offer Program (RESOP) contract either on solar farm scale or a home solar scale.
• You’re knowledgeable about solar energy, renewable energy or the Ontario electricity market.
• Or you’re just interested  or thinking of getting involved with a project.

Call or email me.

You can get my contact details from the Morgan Solar web page.

If you know anyone who meets any of the above, email them a link to this post, or call them.

Image courtesy of Wikimedia Commons, original image URL: http://commons.wikimedia.org/wiki/Image:Ontario-flag-contour.png

HCPV Systems

When talking about investors, people often talk about how you need to communicate what your “magic” is.  What is it that you can do that makes your company special.  And here at Morgan Solar, our magic is in our optics, the Light-guide Solar Optic (LSO).  We can make optical concentration systems that just behave differently, and let us design systems that cost less and work better.  That’s our magic.

But to people on the outside, it’s not always 100% clear what we’re doing with those optics.

HCPV and LCPV

HCPV Systems

HCPV – High Concentrating Photovoltaic systems.  Basically, when talking about concentrating photovoltaic systems, people usually divide the marketing into high and low concentration systems.  There doesn’t seem to be a hard number, but concentration factors over 50 or100 suns are usually considered high concentrating, and low concentration systems usually have concentration factors of 2 suns to 20 suns.  That’s a rough generalization though, there’s no official standard or anything.

Our first project, the one that we’ve talked about and blogged about the most is the Sun Simba HCPV.  This system is based on using the LSO optics to produce between 800 and 1400 suns of concentration.  In layman’s terms, 1000 suns concentration means the sunlight striking the surface of the LSO is redirected to shine out of a point on the edge that is 1/1000th the size of the surface.  So, we can use 1/1000th as much photovoltaic material (PV), and still generate lots of power.  So we’re trading the cost of PV for the cost of a 5 millimetre thick sheet of acrylic.

There’s much to be said about this product, but something I specifically wanted to mention here is that when you’re concentrating light at those levels, you have to track the sun.  So these panels are being designed for ground mounted tracker systems that follow the sun very accurately.  Even if it wasn’t a requirement, when you’re designing systems for solar farm scale applications, adding tracking dramatically increase your total output, and more importantly, your output in the late afternoons and early evenings when electricity demand is the highest.  So the tracker is both a requirement and a benefit.  So for interested home users, this is more realistic in a community co-op model rather than installations at individual houses.

We’re installing a demonstration system at the Earth Rangers Centre, and we’ll be exhibiting another system at the Solar Power International 2008 show.

We’re also working on some LCPV systems, a solar window and a solar wall that concentrate in the 4 to 10 suns range.  I’ll talk more about those in a future post.