My current project (solar)

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Tennessee has spent 62.5 million for a 5 mega watt solar farm in West TN covering 25 acres with 21,000 solar panels. They don't provide any information on ROI from the project. I guess payback doesn't matter when the government is spending our tax money.

I drive past this solar farm quite frequently. It and the one at Shelby Farms are on the TVA program for green power. The program is almost impossible to get into, but if you do manage the TVA pays something like 20+ cents per kilowatt hour during peak usage. At that rate you can turn a profit in under 5 years with the size arrays they are running.
Solar currently has a bad ROI for homeowner/small business scale operations, but if you have the cash to go big it can be very profitable in addition to being one of the greenest ways to generate electricity, period. In this case they are not throwing our tax dollars away - this is a sound investment in our future imho.