Global energy usage and climate change have prompted a shift towards sustainable energy solutions in electric distribution networks (DNs). This study employs case studies to discuss sustainable energy systems’ issues, strategies, and technological advances to improve electric DN performance. Renewable energy sources are gaining popularity as fossil fuels pollute the environment and jeopardize energy security. However, intermittent renewables like solar and wind endanger grid reliability. Thus, sustainable energy systems require advanced energy storage like batteries, pumped hydro storage, and flywheels, which can store and release energy during high and low production while maintaining grid power stability. Including renewable energy requires revaluing utility infrastructure. Utility demand-side management further improves grid stability by dynamically adjusting energy usage during peak demands. Future electric distribution grid sustainability requires electrifying transport and heating. Electric vehicle (EV) integration presents challenges and opportunities as their use rises. Controlled electric vehicle charging reduces grid demand and enables the grid-to-vehicle and vehicle-to-grid interactions, making the grid more dynamic. This work focuses on the integration benefits of sustainable energy systems, such as wind, solar, and photovoltaic energy systems, along with electric vehicle charging stations, through case studies.