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Solar rooftop grid tie pricing in the USA is about $1.60/ nameplate Watt just for the parts. Installed pricing is $3.30/ W for roof top and $2.10 for grid scale. It is a waste of money in the North East (and Germany and Russia). But will eventually become much better than nothing in 50 years. But it is a good idea to mandate that new structures, most of which will last much more then 50 years, have their major roof section oriented to the sun in readiness for the day when solar PV should be installed.
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