Overview

• The 15 South line's opening has been delayed to the fourth quarter of 2026, a six-month postponement from the previously revised timeline of summer 2026.
• Lines 16 and 17, originally expected by late 2026, are now projected to open in the second quarter of 2027 due to shared technical systems with the 15 South line.
• Technical challenges, including adjustments to automated systems and software, were cited as key reasons for the delays, according to the Société des Grands Projets (SGP).
• Valérie Pécresse, president of Île-de-France Mobilités, has called for a control and coordination mission to minimize delays and ensure greater transparency in project updates.
• The delays do not impact the northern section of the 15 line or subsequent sections of the 17 line, which remain on schedule.