In order to solve the issue of energy-saving protection in IP over WDM networks

a Hold-Time-Aware Green Shared Path Protection（HTAGSPP）algorithm is proposed.The algorithm also considers the issues of holding-time of traffic and use of renewable energy.It encourages choosing the path with the least additional traditional energy consumption during the holding-time of traffic.The simulation results show that our proposed algorithm can not only maintain a low blocking probability and use renewable energy effectively

but also reduce traditional energy consumption and carbon emissions by using more renewable energy

when comparing with other traditional energy-saving shared path protection algorithms.