Enterprise architecture (EA) has become an essential part of managing technology in large enterprises. These days, automated analysis of EA is gaining increased attention. That is, using models of business and technology combined in order to analyze aspects such as cyber security, complexity, cost, performance, and availability. However, gathering all information needed and creating models for such analysis is a demanding and costly task. To lower the efforts needed a number of approaches have been proposed, the most common are automatic data collection and reference models. However these approaches are all still very immature and not efficient enough for the discipline, especially when it comes to using the models for analysis and not only for documentation and communication purposes. In this paper we propose a format for representing reference models focusing on analysis. The format is tested with a case in a large European project focusing on security in advanced metering infrastructure. Thus we have, based on the format, created a reference model for smart metering architecture and cyber security analysis. On a theoretical level we discuss the potential impact such a reference model can have.