How much Electricity does Solar Power generate?

I’ve spent quite some time and effort on calculating the space requirements of wind power installations during my time at the Canadian Nuclear Association. The fruits of my labor can be found on pages 13 and 24 of the Canadian Nuclear Factbook (the numbers are actually not quite correct, they greatly favor wind by assuming a pretty unrealistic utilization rate of 25%).

However, calculating wind is easy. Turbine manufacturers are more than happy to post the capacity of their machines online, and there’s also a lot of data available on the productivity of various wind farms, both in the EU and North America. The rest is simply geometry.

Solar power installations are trickier. There are far more variables in terms of the technologies used and the local geography. Also, solar power manufacturers seem far more coy about the generating capacity of their products, at least as far as their websites are concerned. I think the reason is that the technology simply isn’t that straightforward.

However, there are the occasional nuggets of good data that can be used to extrapolate some of the data I am interested in. For example, in this recent post by the US DOE, we find the following data:

Mesquite Solar 1 taps into 300 days of sunshine each year to generate 150 MW of clean electricity — enough to power about 30,000 homes.

Let’s break this down:

According to SW Energy, annual electricity consumption for per household is just above 11,000kwh.

If this facility can provide power for 30,000 households, it must generate at least 330,000,000kw/h annually.

Since the anticipated output of Mesquite Solar 1 is to be  about 330,000,000 kw/h, this means that even in an ideal location like the Arizona desert, a solar power facility can be expected to operate with at about 25% utilization.

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