The main difference lies in their composition and installation. ADSS cable is non-metallic and can be installed on energized power lines without a power outage. In contrast, OPGW (Optical Ground Wire) is a metallic cable that serves a dual purpose as a ground wire and a fiber optic communication path. OPGW installation requires a power outage, and it is typically a more complex and costly process. For applications where a new communication line needs to be added to an existing power grid without disrupting service, ADSS is the preferred and more economical choice.