Abstract : A sustainable energy future requires a wide range of different mitigation options that can reduce the CO2 emissions. Particularly, renewables and carbon capture and storage appear as preferred or more largely evocated options. The aim of this study is to analyze alternative development paths of the energy system investigating different constraints on the use of CCS and BECCS, under climate policy context, and using the global multiregional optimization model, TIAM-FR. The analyze also focuses on the increasing pressure involved by the development of carbon capture technologies (fossil and biomass) on the water resources. Water and energy are indeed inextricably linked and interdependent sectors. Water requirements of existing and emerging technologies (such as carbon capture technologies) are so necessary to completely assess the water impacts of a developing decarbonizing economy.