Ask them for ROI on the investment. There is none. All this is - is a feel good decision. However, I do not understand the difference environmentally if we are buying hydro power (which is constant) to sun power that requires you to have a battery bank (and that may not be sufficient for prolonged sunless days). The annual increase in the contract exceeds the historical rate increases. I did this on almost a 100% sun capture and based on the limited carry forward of the credits, I calculated a net loss over time on the investment.