Since 2018, a summer program in July and August with lyrical, symphonic, jazz, dance, pop rock and world music sounds takes place.

But its old-fashioned appearance and the inadequacy of the services it could offer meant that it was extended at the beginning of the 20th century,[4] to the location of the bandstand of 1866, which was moved to the Place de la République (which would be destroyed in 1935 for the construction of the Post Office).

The old theatre was then converted into a games room (now transformed into the large auditorium of the Palais des Congrès).

In July 1940, after the French defeat at the start of the Second World War, the Pétain government moved to Vichy and the opera house was the scene of the vote of full powers to Marshal Pétain by the parliamentarians, inaugurating the collaborationist regime.

The city of Vichy acquired the building the following year and restored it in 1995, taking advantage of the work to install heating in the opera and thus allow a winter season to open.