Renewable energy integration and energy efficiency are critical components of sustainable energy systems. Integrating renewable sources like solar, wind, and hydro into the power grid reduces dependency on fossil fuels, mitigates greenhouse gas emissions, and enhances energy security. Energy efficiency measures complement this integration by optimizing energy use, lowering consumption, and reducing operational costs. Together, they promote a resilient and sustainable energy infrastructure, supporting environmental goals and fostering economic growth. Advances in smart grid technologies, storage solutions, and regulatory frameworks are pivotal in maximizing the benefits of renewable energy and achieving comprehensive energy efficiency.