The development of energy efficiency in unmanned aerial vehicle operations was proposed in this work. Tremendous and remarkable achievements have been recorded in the area of unmanned aerial vehicle operations with regards to energy efficiency. The principal aim of energy efficiency while maintaining accurate collision avoidance. Characterization of the energy consumption of a conventional unmanned aerial vehicle was first carried out, then, A successful characterization was followed by development of a Simulink model of the conventional unmanned aerial vehicle with the characterized parametric values as input for simulation. With a reliable simulation result, then a model on energy efficiency was developed. This model was simulated in order to validate and justify the work. Velocity and energy-time graphs were plotted to show the relationships of velocity and time of unmanned aerial vehicle flight as well as energy expended and time. Computations from the plotted graphs show an energy efficiency of 8.3% over a conventional operation of unmanned aerial vehicle without the application of the technique in this research. This is the percentage of improvement. It is a justification and validation of this research on the use of energy efficiency in unmanned aerial vehicle operations. It has been established that energy consumption in unmanned aerial vehicle operations is influenced by its mode of operation at a given time. There is an obvious reduced running cost with energy efficiency.