Energy efficiency measures are generally less expensive than a renewable energy (RE) system to provide the same amount of energy saved. The Energy Information Administration reports that, on average, a dollar spend on efficiency saves $2 off the cost of a renewable energy system to provide the same amount of energy (IEA, 2011). But as the saying goes, "you can't save yourself rich" and having installed sophisticated controls and efficient systems, we need some source of energy to power them. The main reasons to consider RE is cost-effectiveness, but other reasons area as diverse as: reduction...