- 1927: Denis Degreane founded the company Ets DEGREANE based in Toulon
- 1960: The Electronics department was set up
- 1978: Ets DEGREANE became part of GTIE (VIVENDI)
- 1984: Started working in the meteorology sector in partnership with Météo France
- 1989: First export contract for meteorology systems, to install the SIOMA system at Agadir airport (Morocco)
- 1997: ISO 9001: 1994 certification
- 2002: The Electronics department of Ets DEGREANE became a subsidiary with the set up of DEGREANE HORIZON, a simplified joint stock company (SAS)
- 2003: GTIE became VINCI Energies
- 2004: DEGREANE HORIZON relocated to Cuers (in the Var)
- 2009: ISO 9001: 2008 certification renewed
- 2015: Attached to VINCI Energies “International & Systems” Division
- 2018: ISO 9001: 2015 certification renewed
- 2019: ISO 14001: 2015 certification
- 2020 : AEO certification
