The story
In 2010, the first stores were tested in France in Écully, Vénissieux and Lattes, in Spain in El Pinar and in Belgium in Mont-Saint-Jean.
In 2011, in France, 6 regular Carrefour hypermarkets became Carrefour Planet in Essonne, La Ville-du-Bois, Les Ulis, Villabé Athis-Mons, Vitrolles and Wasquehal.
In July 2011, the first Carrefour Planet was opened in Paderno Dugnano, Italy of 13,000 square meters.
In 2012, it was announced that the transformation from Carrefour to Carrefour Planet costs too much, as a result Carrefour stops further process of converting Carrefour hypermarkets, hypermarkets already converted to Planet stays as-is but loses the Planet sign in France.
As of August 2013, there are still 15 Carrefour Planet stores in Belgium, 1 in Greece and 1 in Italy.
From Wikipedia’s article on Carrefour Planet, shared under CC BY-SA 4.0.3