This document provides a guide for the development of a functional specification for electric transportation fast charging station management and control systems, including the energy management and grid interaction functions. The fast charging station may incorporate local energy sources, including renewable energy resources such as solar photovoltaic (PV) generation, and battery energy storage systems. The document develops guiding principles for the implementation and deployment of fast charging station control systems and the basic functional requirements for the control system, and presents a set of core functions. These include: electric transportation energy storage discovery and evaluation of charging requirements; monitoring and control of charging profiles; charging station energy estimation, energy scheduling and management; charging station grid interaction and interaction and grid power exchange management. Grid code requirements and ancillary services provision are addressed.