The International Energy Agency stresses the need for achieving net-zero emissions by 2050 to limit global warming to 1.5°C, highlighting the importance of transitioning urban buildings to cleaner energy sources. Community energy systems, powered by renewables and efficient storage technologies like batteries and hydrogen, present a sustainable solution for urban decarbonization. However, energy models face limitations due to uncertainties in climate conditions, human behaviors, and community design layers. To address these challenges, methods such as sampling and generative adversarial networks are utilized to generate diverse energy input scenarios. Moreover, the deployment pathways of community energy systems greatly impact shared benefits and participation motivation among interconnected households. Community green hydrogen systems, while promising, require clear deployment pathways to ensure cost-effective expansion in urban areas, especially in advanced economies striving for early net-zero emissions. Integrating detailed community design layers into energy planning is crucial for maximizing economic and environmental benefits. Achieving a balance between diverse energy profiles and urban planning robustness is key. Overall, community energy systems offer a pathway for sustainable urban decarbonization, with community green hydrogen systems playing a vital role in the energy transition.