Energy security is a dynamic term with many alterating aspects, some more frequently used than others. Furthermore, humankind is becoming increasingly dependent on energy to sustain today's modern lifestyle and therefore the topic of energy security is becoming more important than ever. The trend of validating energy security is also expanding from an exclusively national context to the inclusion of, for example, the operations of a single organization. One of these organizations is the housing company, Uppsalahem, with their ambition to transform their energy system in line with their aspiration to reduce environmental impact and assure that it withstands the threats of tomorrow. This thesis aims to explore the adaptation of energy security validation from a national perspective to a company perspective with Uppsalahem as the main actor. With this in mind, the validation methodology was constructed. It included a risk analysis, indicators of energy security and a correlation analysis. The combination of these three were selected with the ambition to shed light upon several aspects of energy security. Uppsalahem's electrical and heat supply systems were then subjected to the validation and the results implied that Uppsalahem is situated in a state of dependency with its suppliers. Therefore, it is in Uppsalahem's best interest that their operations are sustained and external and internal defects are avoided. This thesis presents serveral measures that can be implemented in order for Uppsalahem to minimize its dependecy on external suppliers as well as reduce the risk of malfunction within its internal operations.