Problem is, in the solar industry right now when a more efficient method is found they tend to price it out of range of decent pay back range. At our corp. we have 2 wind turbines, 3 methane generators, and a waste burner generator, all in an effort to "go green" and solar for electricity is running 4 times longer in the pay-back department so we avoided it. We do use a small bank of solar for hot water regeneration but not electrical.