Swiss Federal Lab Claims New World Record For Solar Cell Efficiency

Ok, let's do the math. Total electrical consumption (not all energy usage, just electrical) for the US is about 480 gigawatts. Average insolation is about 1 kw per square meter. At 10% efficiency, that means about 100 watts for every square meter of panel. That means you need 4.8 billion square meters of panels. 4.8 billion square meters can fit into a square 69.282 kilometers on a side. That's somewhere between the size of Rhode Island and Delaware.

Even if you expand that to all energy usage, not just electrical, you're talking approximately 3 terrawatts. So, that's about 30 billion square meters of panels. That's a square about 173.2 kilometers on a side. That's somewhere between the size of Maryland and Hawaii.

So, if you actually sit down and DO the math, you can easily cover US electrical requirements and, in fact the total US energy usage (not counting food energy and not considering the fact that much of that energy usage can't currently be converted to electrical) without coming remotely close to covering the US with solar panels.

Of course, if you'd actually done the math on your own claims, you would have realized that, when you claimed that you could "optimistically" supply 7.5% of the US's electrical supply with 0.01% of the surface area, that would mean that you could "optimistically" supply 100% of the electrical supply with 0.133334% of the surface area, or even pessimistically (let's pretend that the difference between "optimistic" and pessimistic is an order of magnitude) with 1.33334% of the surface area.

So, it's pretty clear that you either didn't do the math yourself, or you just decide to bluff. If you meant something else, like that there are logistical problems in covering that much area, then say so.

Source: http://rss.slashdot.org/~r/Slashdot/slashdotScience/~3/6-gC0hnND2Y/story01.htm

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