Addressing climate change and achieving the 1.5°C target requires a transition from a centralized, fossil-fuel-based towards a decentralized, renewable-based energy system. Long-term, large-scale energy systems models, such as Nexus-e, are useful in improving our understanding of such transitions and are seeing increased relevance in the face of stringent climate policy, energy security, and economic development concerns. However, they often lack appropriate spatiotemporal resolutions to capture the broad scope of economic and technical challenges. In this project, we collaborate with Prof. Arno Schlüter and the Singapore-ETH Center to tackle current energy system modeling limitations by coupling the City Energy Analyst tool with Nexus-e.