By design, engine gen-sets provide full and reliable backup power â€” if they're properly set up. For this to happen, you must decide which loads the gen-set will support, properly size it to those loads, and select the appropriate switching equipment. Start this process by identifying the purpose of the gen-set. What is your goal? Are you trying to provide emergency backup power? Do you want a standby source, or are you trying to lower costs through peak shaving or base loading?