With energy markets throughout the world moving rapidly into re-structuring, liberalisation and privatisation, this presents a major challenge to traditional modelling approaches. Econometric methods have limited applicability for a new environment and optimisation techniques of "planning" are less relevant in an era of market forces. This paper presents the use of system dynamics, in a generalised way, to provide a platform for integrated energy analysis. Issues of modularity and policy evolution are important in the design of the system to facilitate its use, and reuse. In the 18 months since this work began for the Colombian Ministry of Energy, it has had to evolve to support the analysis of a number of changing perspectives and constraints. Hence the concept of a platform rather than a model has to be implemented in a coherent way if it is going to provide sustained value for on-going governmental policy support.