These lecture notes provide a comprehensive guide on Grid Modeling of Renewable Energy, offering a foundational overview of power system network modeling, power flow, and load flow algorithms critical for electrical and renewable energy engineering. Key topics include steady-state, dynamic, and frequency domain models, with a particular focus on renewable energy integration, simulation techniques, and their effects on grid stability and power quality. Practical examples using Matpower and Pandapower tools are included to reinforce concepts, ensuring that students gain hands-on experience in modeling and analyzing modern energy systems under variable conditions.