In April 2015, Luminus took a majority stake in ATS Group with a view to offering energy services to their B2B customers. Spurred on by Luminus, a fourth pillar of activity was developed, namely HVAC and energy solutions. In a short space of time, the group grew with a number of HVAC installation companies and, within this pillar, fully focused on energy efficiency solutions: smart buildings, battery systems, relighting, PV installations, electrical charging points, building management, etc.