With the FiT (Feed-in Tariff) as it stands, a typical ROI of over 10% is probably a low estimate. This revenue will run for 20 years. In addition to fixing, lowering or even eliminating electricity costs,  your running costs can be predicted allowing for more accurate financial forecasting. Solar PV used by your business also speak volumes about your firm's commitment to lowering carbon and building a sustainable clean energy economy. What other form of investment adds this level of value?