At the same time, under the impetus of the Marchal Plan, the Mecatech (in 2006) and GreenWin (in 2010) clusters were created with the aim of supervising players in technological development and supporting research and innovation projects in the field. mechanical engineering and in the field of green chemistry. Likewise, it participated in the “Urban Europe” call and in the “Hydrogen-Fuel Cell” JTI. Figure 20 - Walloon public expenditure for energy research and development by type (1999-2017)