The vulnerability of energy system infrastructure to extreme weather events—such as wildfires, floods, severe storms, and freezes—has been highly salient in recent years, with the impacts of climate change on energy system operations only likely to be exacerbated going forward. Complicating such challenges is the interdependence of these systems, with failures in one component of the system’s architecture cascading and propagating throughout the network, often in unexpected ways. This grant funds a collaborative effort led by Timon McPhearson (New York University), Mikhail Chester (Arizona State University) and David Iwaniec (Georgia State University) to investigate linkages associated with power systems, transportation networks, and water facility operations. Looking first at urban systems and then extending their analysis to the regional level, the team will examine how cascading network failures might occur at key connection points across these infrastructure systems. Cities to be modeled include New York City, Phoenix, and Atlanta. Grant funds will support the creation or extension of infrastructure models for each city that combine real world and simulated data to represent municipal power, transit, and water systems. The team will then interview and survey city stakeholders to inform the design of their planned disaster simulations, probing such topics as where flooding might occur, how extended heat waves might impact different parts of a city’s power and transportation infrastructure, or where storms could do the most damage. These inputs will then be used in the design of a series of simulations of likely future extreme weather events that will aim to identify potential cascading impacts in each city and to highlight potential points of failure propagation. Extending beyond this urban analysis, the team will examine the risks associated with interconnected cascading infrastructure failures across the Southeast United States. At the project’s conclusion, the team will hold a day-long, in-person workshop that will bring together key academics, local officials, disaster preparedness planners, utility representatives, and transportation organizations to discuss findings and disseminate results.