Though initially a non-essential feature of a workshop since it can function without power, it will be a good idea to at least have a small generator so you can run a recruitment beacon and a Water purifier if there's a body of water nearby. You can build larger generators but take note that you may need to build pylons to extend the wires for objects requiring power that are placed in some distances. You can also power up a home by crafting a conduit and placing it on the house's roof/ ceiling. This is necessary to enable light bulbs in your home.