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- Saudi Electrical Company - Central Region Branch.
- Saudi Electrical Company - Western Region Branch.
- Saudi Electrical Company - Eastern Region Branch.
- Saudi Electrical Company - Southern Region Branch.
- Saline water Conversion Corporation (SWCC).
- ARAMCO
- King Khalid Military City
- Al Tamimi Co.
- Rheinhold & Mahla ( R & M Beka).
- Monsanto- DMCC-Enviro- Tech & Engineering Ltd.
- Middle East Engineering & Development Co. Ltd. (Meedco).
- Bachmann – USA
- Al Toukhi for Industry & Trading
- Arabian Bemco Contracting Co.
- Nesma & Partners
- Middle East Engineering Ltd. (MEELSA)
- Al Saleem Corporation for Trading & Contracting
