Growing concern of smart city development and urban resilience has become increasingly embedded in urban planning, national security and energy policy. One of the main city documents focused on actions and measures to be implemented in City is Sustainable Energy Action Plan. Taking into account specifics of modern cities and future city development at Smart City level the existing Sustainable Energy Action Plans should be enhanced. Nowadays it is necessary to bring existing standalone energy actions at cross sector level in order to ensure urban resilience. Currently there are 3414 cities across the Europe and eastern partners which already have developed Sustainable Energy Action Plan. The overall aim of these plans is to reduce energy demand and to provide the smart use of resources and make the basic contribution in advancement of cities environment, climate and community health. Taking into account the modern requirements to City energy consumption and CO2 emissions, the standalone energy actions should be integrated at cross sector level. The paper draws attention to areas with high impact to smart city development. In terms of Smart Cities the most powerful actions are those which directly affect at least these three sectors - energy, ICT and transport.