Since 2014 the City of New York has been participating in an energy management and resiliency program called “demand response.” Demand response utilizes real-time electricity metering equipment and a web- based monitoring system in order to curtail building electricity use at peak times, thereby helping to prevent failures in the city’s power grid. City agencies wanting to participate in the program work with NuEnergen, a third party vendor, to enroll their buildings and other facilities in demand response. The agencies are then able to monitor and reduce their electricity use as required by the program, earning revenue from the state’s regulated electricity market for every kilowatt reduced. Program success has been achieved through a high level of collaborative citywide engagement between city agencies’ top hierarchies, program managers, facility managers and the private sector. This case examines how that effort has unfolded, highlighting results and transferrable lessons.