The document defines hazardous energy as stored potential energy that can harm firefighters if suddenly released. It lists various forms of hazardous energy including electricity, gases, water, mechanical systems, pressurized vessels, vehicle components, weather, and animals. The ISO's role is to identify hazardous energy sources, analyze the type of energy and potential impact, and categorize the risk level. Common forms discussed are electrical systems, utility gases and water, mechanical devices, pressurized containers, and weather patterns that can affect emergency response.