Energy manager :that is sustainability; must determine the level of consumption of the company and act on the double front brake to eliminate waste and negotiation with providers. The role is particularly crucial in companies with large energy consumption, but the skills are also expressed during the negotiations with providers; helps the company to optimize and define the level of energy consumption. His work is "cross" between divisions / business functions because they must deal with all the elements: procurement, finance, management ... It is a figure that requires expertise in both technology and finance with adequate training on the policies that govern the sector.