FLOWSTAR-Energy is a practical, high resolution model that simulates air flow and turbulence over flat or complex terrain, including the effects of stratification, variable surface roughness and wind turbines in operation. FLOWSTAR-Energy is an extended version of the FLOWSTAR model of flow over complex terrain; FLOWSTAR-Energy provides the flow field and turbulence output familiar to users of FLOWSTAR and in addition provides a range of essential outputs for wind farm planning, including estimates of free stream, gross and net energy yields.