The Challenge of Energy Efficiency in Action. As digital activity grows by 6 to 7% per year, how can data centers reduce their actual energy consumption? This roundtable brings together participants from Season 2 of the CUBE Data Center competition to share concrete, “no-construction” solutions: fine-tuned monitoring, management of “ghost machines,” and engagement of IT teams. Through testimonials from a major private-sector player, a public institution, and an industry expert, discover how a collective challenge can transform energy performance into a driver of competitiveness and digital responsibility.