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Commercial-scale solar projects have been historically been expensive and difficult to build. But data from the US Energy Information Administration (EIA) and the National Renewable Energy Laboratory (NREL) shows that self-generation is now the least expensive way to power a building or campus.
Note: these numbers are based on national averages. Actual prices for commercial grid electricity vary by state and the cost (LCOE) of commercial-scale projects is heavily dependent on local factors like annual sunlight (irradiance) and financing costs. Nonetheless, even with local variances, the majority of commercial solar projects are now very economically attractive.
You can see and download the original PowerPoint for this figure below
To see the original source links and calculations, click here: Is it cheaper to build commercial-scale solar or buy from the grid?