Dalkia was originally known as the Compagnie Générale de Chauffe (CGC), founded in 1935. In 1967, Chauffage Service (founded in 1944) merged into CGC. In 1980, CGC was acquired by (CGE, later renamed Vivendi in 1998). CGC merged with Groupe Montenay in 1986 to form Compagnie Générale de Chauffe/Groupe Montenay, which was further merge. [pdf]
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