The Power Efficiency Guide – PDF ebook download by Mark Edwards. Mark Edwards’ book makes it easy to enjoy the benefits of becoming energy efficient. In the first place, you are going to find yourself saving more money than you ever imagined. The month to month energy savings are going to prove to be impressive, to say the least. At the same time, don’t lose sight of the fact that you are going to be embracing green-friendly measures, as well. If you want to be better in control of your situation, while also reducing your carbon footprint, this is the guide for you!