This practitioner guide presents a structured implementation framework for designing and deploying decentralized energy systems for irrigation-dependent agricultural operations. Rather than promoting standardized technology configurations, the framework emphasizes context-specific system design based on crop characteristics, irrigation schedules, energy demand profiles, local renewable resources, groundwater conditions, economic considerations, and operational constraints. The guide is intended for agricultural engineers, Extension professionals, rural electric cooperatives, technical advisors, project developers, and producers seeking practical guidance for evaluating and implementing decentralized agricultural energy systems. It provides a five-step implementation methodology covering farm assessment, energy resource evaluation, system architecture selection, commissioning and optimization, and knowledge transfer, supplemented with implementation checklists, practitioner notes, return-on-investment considerations, assessment tools, and implementation partner evaluation criteria. The framework synthesizes field deployment experience with systems engineering principles to help bridge the gap between renewable energy technologies and successful on-farm implementation. It is designed to support adaptation across diverse agricultural contexts and to facilitate continuous refinement through practitioner experience and operational feedback.