That makes no sense to me. Roof space is unused (essentially free), and the panels shade the house making it more livable and efficient. Land you can use that is near your house is your yard- extremely valuable and expensive. Putting it elsewhere requires buying the electricity from someone else, all of the costs and losses of a power grid, and unreliability of a power grid.

Installing a solar panel on a roof is not exactly expensive, complex, or difficult. Virtually every house in my neighborhood has them.