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The continuous growth of the Internet in the last decade has contributed to an unprecedented increase of the total amount of energy consumed by telecommunication networks worldwide. In this context, Wavelengths Division Multiplexed networks, besides providing benefits in terms of high transport capacity, have been recognized as an effective solution to achieve substantial power savings in core transport networks, which are the focus of our work. One critical issue for telecom operators is network resilience to failures. When provisioning network capacity, operators need to reserve additional (backup) resources, to be used in case of failures of currently used (i.e., working) resources. However, backup network resources do not need necessarily to be powered-on when not used. In fact some network services may have looser requirements in terms of connection recovery time, and they can be put into a low-power …