This document presents a context-specific engineering methodology for the design, deployment, and operational integration of decentralized energy systems serving irrigation-dependent agricultural operations. The methodology was developed through graduate research in Energy Systems Engineering and validated through representative field deployments that have operated continuously since 2021. The framework addresses a practical implementation gap in agricultural renewable energy deployment by integrating wind and solar resource assessment, irrigation load profiling, crop-specific water requirements, storage sizing, automated energy dispatch optimization, commissioning, and structured knowledge transfer into a unified deployment process. Rather than applying standardized residential or commercial installation practices, the methodology uses resource-demand coincidence analysis and farm-specific operational characteristics to determine technology selection, system architecture, and dispatch strategies tailored to each agricultural operation. The document is intended as a technical reference for engineers, Extension professionals, technical advisors, researchers, electric cooperatives, and organizations supporting decentralized agricultural energy deployment. It is published to encourage technical review, practitioner feedback, and continuous refinement through representative field applications and knowledge exchange.