YACYLEC S.A.:

Engineering, construction, operations and maintenance of the first Yacyretá interconnection.

LITSA S.A.:

Engineering, construction, operations and maintenance of the second Yacyretá interconnection.

SYSTRANYAC S.A.:

Partnership integrated by five Argentine construction companies involved in the Yacyretá project and other infrastructure developments. This company has also shares in Yacylec S.A.

CITELEC:

It is the investment and controlling company of TRANSENER Group. Transener S.A. is the main service provider of extra high voltage electric energy transportation service in the country.