[en] Covering the theme of energy mix evolution, this publication proposes a first article about the quantity of CO₂ which can be saved through photovoltaic electricity production (the author highlights energy substitution effects in electric fleet, and shows that the substitution efficiency changes markedly on the short term with respect to the installed photovoltaic power). Then, it proposes a retrospective analysis of the cost of French nuclear reactors (the author invalidates arguments according to which nuclear costs would significantly and structurally drift), two analyses of future markets (one on the total cost of ownership of vehicles, and the other on a new vision of a possible future of fast neutron reactor markets). The next article proposes a prospective approach of solar mobility at the crossroad of technical, organisational and even behavioural innovations (vehicles, production and fixed and onboard storage). The author of the next article outlines how prospective studies must incorporate interdependence between markets