​​Since the widespread installation of overhead optical groundwire (OPGW) technology in the 1980s, the utility industry has learned much about deploying OPGW. However, there are still knowledge gaps related to the types and reasons for utilizing this communication technology, as well as the design, testing, installation, commissioning and ongoing maintenance of OPGW systems. This two-part Surveillance article series summarizes the CEATI Transmission Overhead Design & Extreme Event Mitigation Interest Group's report: Guidelines for Optical Groundwire Technology. It provides utilities with valuable information on current OPGW practices, as well as gaps in knowledge and experience and how to mitigate these gaps.