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For the cost of installed solar power, size matters. For residential and commercial systems smaller than 10 kilowatts (kW), the installed cost was $6.10 per watt in 2011. For commercial systems of 100 or more kW, the cost was only $4.90 per watt.
Some might argue that even the sensitivity analysis underestimates is too bullish on solar costs, but the world market suggests otherwise. At the end of 2011, while the average installed cost of U.S. solar lingered at $5.20 per Watt, Germans installed solar at an average cost of $2.80 per Watt.