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1853: Compagnie Générale des Eaux (CGE) (later Vivendi, then Veolia Environment) is founded.
Montenay, a company established in 1860 primarily geared towards fuel trading, signed its first heating plant management contract with the city of Tours.
Groupe Montenay, founded in 1860, merges with Compagnie Générale de Chauffe.
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Under Georges Montenay, the company established a coal distribution business in 1929.
1935: Chauffage Service is founded.
1944: Compagnie Générale de Chauffe (CGC) is founded.
In 1958, CGC extended its business to include facilities management when it was awarded the heating management and facilities maintenance contract for all of the United States' NATO military bases in France.
1960: CGC and Chauffage Service merge as CGC.
1967: CGE acquires a stake in CGC.
Montenay went on to develop its own international component, starting in Belgium in 1968.
In response to the soaring price of oil, CGC began developing energy recovery systems and heating systems based on geothermal energy sources in 1973.
1980: CGE acquires control of CGC.
As part of that restructuring, CGC acquired Société Auxiliare de Chauffage in 1982.
1986: CGC acquires Montenay.
The first waste drop-off centers open in 1986.
The Onyx brand is created in 1989.
In 1990, the company founded CGC Entreprise Nord and acquired several local businesses, including Bouchez, based in Calais since the late 18th century; Bele, based in Dunkirk; and Dehon, based in Saint-Quentin.
1994: CGC acquires Bergeon.
As part of its restructuring effort, the company merged CGC and Montenay in 1995, creating the Energy Services division.
In 1995, for example, the company, which had already entered South Korea through a stake in Kukdong Energy, increased its position there with the formation of the joint-venture Hanbul Energy Management Co.
The arrival of Jean-Marie Messier as head of the company in 1996 spelled the dawn of a new era for CGE and its energy services subsidiaries.
In 1996, USP (train stations and trains), Comatec (urban transportation) and Rénosol consolidate to form the Cleaning division at Onyx.
1998: CGC becomes Dalkia.
In 1998, Compagnie Générale des Eaux changed its name to Vivendi.
Toscer, Olivier, "La salade Niçoise de la filiale Dalkia," Nouvel Observateur, July 27, 2000.
Dalkia's international component, named Dalkia International expanded the group's operations in 2001 with the acquisition of Italy's Siram SpA. That purchase gave Dalkia control of the leading energy services operation in Italy.
In 2002, Vivendi Universal reduced its stake in Vivendi Environment to just over 20 percent.
The company's own power production capacity nears 4,000 megawatts (MW). These operations combined to produce more than EUR 5.1 billion in annual sales ($5.5 billion) in 2003.
Dalkia now constituted the energy services arm of Vivendi Environnement, which, in 2003, became Veolia Environnement.
2004: Dalkia acquires 93 percent of Czech Republic's Teplarna Usti.
Arts James D. Thornton named chairman of board for Baltimore Museum of Art Thornton, a museum board member since 2004, succeeds Clair Zamoiski Segal, who held the position for seven years.
On 25 July 2014, the EDF Group acquired 100% of Dalkia assets in France, which now represent its core business in energy services.
In 2015, Dalkia was joined by ZEC Katowice S.A, currently Dalkia Polska Energia S.A., an operator involved in the management, optimization and development of municipal heating networks in the region of the Silesia-Dąbrowa conurbation.
In 2017, Dalkia completed its offer in Poland, acquiring the company Matex Controls, currently Dalkia Polska Solutions sp. z o.o., specialized in providing of energy efficiency in buildings and industrial facilities.
As a result of rebranding, from 19 September 2018, the Dalkia group companies in Poland operate under one common brand.
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