Utilities within the U.S. energy sector are inundated with outside threats – often from angry customers, environmental groups, hacktivists, and criminals looking for targets of opportunity. These cyber and physical threats often focus on interrupting services or destroying critical equipment for the purposes of inflicting damage and embarrassing the utility. An insider threat is most commonly defined as a security threat that originates from within the organization being attacked or targeted, often by an employee of the organization. Insiders pose the greatest threat, especially if they are working with a foreign state or other high level threat actors.”]
Source: https://www.csoonline.com/article/3113737/combating-insider-threats-faced-by-utilities.html