Malevil
In southern France, in a quiet little town, the mayor, who also owns a castle with some cattle, is in the wine cellar with some other people: the pharmacist, the veterinary, and some of his employees. As they are drinking wine, they hear a terrible noise and the heat's getting higher and higher. They don't realize what's happening: when they come out of the cellar, they realize that everything has burned, and all the buildings are destroyed...
Starring Michel Serrault, Jacques Dutronc, Jean-Louis Trintignant, Jacques Villeret, Robert Dhéry, Hanns Zischler, Pénélope Palmer, Guy Saint-Jean, Michel Berto
It's a drama and science-fiction movie, and has a rating of 6.5 out of 10 from Imdb which is usually fine for this kind of movie.
Watch it here
Not found streaming from Ireland.