3E Eng has carried out projects and training for compagnies throughout Québec, Canada and internationally.
- AFD
- Agnico Eagle Mines
- Boréal Entrepreneur Électricien
- Chantier Davie Canada
- EBI Electric
- EXP
- Fafard et Frères
- Filtrum
- Fortress Specialty Cellulose
- Ocean Group
- Hubbell Power Systems
- Hydro-Québec
- IUCPQ
- LM Wind Power
- Magotteaux
- Manitoba Hydro International
- MWH, Stantec
- Norda Stelo
- Parmalat
- Recyclage Vanier
- Société de transport de Montréal
- Société des traversiers du Québec
- Stove Builder International
- Techsol Marine
- Teknion
- Tetra Tech
- Texel
- European Union
- Vexco
- WSP Global
