Abstract—In this paper we show how users can access and display new power measurement hardware counters on Cray XC30 systems (with and without accelerators), either directly or through extended prototypes of the Score-P performance measurement infrastructure and Vampir application perfor- mance monitoring visualiser. This work leverages new power measurement and control features introduced in the Cray XC supercomputer range and targeted at both system administrators and users. We discuss how to use these counters to monitor energy consumption, both for complete jobs and also for application phases. We then use this information to investigate energy efficient application placement options on Cray XC30 ar- chitectures, including mixed use of both CPU and GPU on accelerated nodes and interleaving processes from multiple applications on the same node.