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Energy, environment, urban planning, and living standards are all common elements city planners must consider when building sustainable and smarter cities of the future. To equip local officials with the tools they need to find integrated solutions, EPA researchers designed the City-based Optimization Model for Energy Technologies (COMET). COMET allows users to examine the next 40-50 years of energy technology evolution, based on their planning criteria. The model provides practical and applicable energy policy solutions for cleaner energy, especially for cities that aim to achieve air pollution emissions reduction targets. The tool can reveal how the energy system can be balanced at the city level under a different set of scenario assumptions, and how system costs and resulting emissions change with respect to those scenarios.