There are many different solution available to meet a given energy demand. These solutions may differ significantly not only in their technical and economic characteristics but also in their effects on the environment. The purpose of this article is to present principles, considerations, and methods for a complex assessment of the production, conversion, transportation, storage, and end-use of various types of energy. The authors present seven distinct approaches, principles, and methodologies that are commonly employed to comprehend the consequences of various energy utilization solutions. The characteristics of each model and the range of information provided by each solution are presented through concrete examples. The applicability of different methods and approaches is also analysed comparatively. These methods have not yet been translated so far into a coherent, integrated model by either engineering practice or academia, although an accurate understanding of the impacts on the sustainability and energy trilemma necessitates applying as complex analytical solutions as possible. The objective of this article is to collate, evaluate, and harmonise a range of widely used energy usage evaluation models. The aim is to propose a coherent, integrated approach to facilitate a more comprehensive understanding of the environmental, technical, and financial implications of different energy utilisation approaches.