This United States Army and United States Marine Corps USMC manual, Army Techniques Publication ATP 3-34.45 MCRP 3-40D.17 Electric Power Generation and Distribution April 2021, is a compilation of tactics, techniques, and procedures found in doctrine, lessons learned, and other reference material that, for the first time, provides an integrated systematic approach to electric power generation, distribution, and management. It codifies lessons learned over the past 16 years and serves commanders and their staffs as a comprehensive guide for planning, producing, distributing, and managing electrical power in support of military operations. ATP 3-34.45 / MCRP 3-40D.17 is suitable for Army and Marine Corps commanders / leaders and their staffs at all echelons, but the principal audience for this manual is the engineer staff, officers at brigade / Marine air- ground task force (MAGTF) headquarters and below, and planners who have staff proponency for electrical power generation and distribution. It is also a valuable reference for Army and Marine Corps trainers, educators, and combat developers and other Services.