Achieving exaflop capabilities imposes some challenging tasks, such as the performance evaluation in HPC, the understanding of the computational requirements of scientific applications, its relation with power consumption, and ways to monitor a wide range of parameters in heterogeneous environments. Considering these challenges, this work proposes a methodology for evaluating the performance of scientific applications in HPC and the analyses approaches and the tools to monitor the performance and the power consumption. Additionally, we present how to use this methodology to assist in the evaluation process of the energy industry applications while our own performance and monitoring tool is proposed.