Office buildings typically depends on electricity for most of their operations and have little need for heat energy. The consumption of power in an office building during the day time is much greater than that of the night time, which makes them ideally suited to solar power where electricity is generated only during the daytime.. Installing solar PV on commercial roofs can make sound economic sense; it reduces carbon emissions, offsets the need to purchase peak time electricity from the grid, puts unused rooftop space to good use, and helps to insulate companies from future electricity price fluctuations. It could also benefit from income from the Feed-in Tariff. Despite the challenges commercial solar is a viable way of electricity reducing bills and saving carbon.