This study introduces the design and optimization of a hybrid solar photovoltaic (PV)–battery–diesel generator system for powering a telecom tower and nearby households in Tanzania. Using MATLAB/Simulink for modeling and analysis, the system addresses a telecom load of 3 kW and an AC household load of 1.54 kW. Solar PV serves as the primary energy source, supplemented by battery storage for periods of low solar availability and a diesel generator for backup to maintain uninterrupted power. The optimization focuses on minimizing operational costs, reducing carbon emissions, and improving reliability in off-grid rural settings. Incorporating site-specific solar irradiance and load profiles, the model simulates energy flows and storage dynamics comprehensively. This simulation-driven approach provides a resilient solution to energy access challenges, bolstering telecom infrastructure while enhancing community living standards.