In this article we present an application of the energy and climate policy Interactions (ECPI) decision support tool for qualitative ex-ante assessment of 21 combinations of energy policy instruments. Considering the weight given to each criterion of ECPI, we reached an overall result that policy instruments are considered quite fungible as regards their integration to an overall energy policy mix. Interactions of policy instruments for increasing renewable energy sources utilization with energy efficiency improvement and climate change mitigation instruments present a substantial added value compared to their stand-alone implementation.