There’s an article from Lake Havasu AZ (08/21/08) about a church which installed a solar roof. It cost $100K and they expect to save $20K per year. It helps that they can get various rebates. One point is that the church is only heavily used one day a week and can sell a lot of the electricity that they generate to the grid.
The article also mentions that the average residential installation in AZ is 4 to 7 kW and costs about $8/W. The church cost was slightly less ($7.14/W for 14kW), suggesting that the cost benefit scales only slightly.
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