Repositorio Institucional de la Universidad de Oviedo

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This research was partially funded by the Government of the Principality of Asturias through its predoctoral grants program. The authors also acknowledge the financial support from the project "Oviedo Efficiency Group" FC-15-GRUPIN14-048 (European Regional Development Fund and Principality of Asturias, Science, Technology and Innovation Plan 2013-2017) and the project ECO2013-43925-R (Spanish Ministry of Economy and Competitiveness). Finally the authors want to thank the editor and two anonymous reviewers of The Energy Journal for their comments.