High voltage transformers and autotransformers with powers up to 600 MVA and voltages up to 500 kV.
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On May 18, 1895, The Hermannstadter Elektrizitätswerk A.G. - Electrical Plant Sibiu is founded, whose main activity is the production of electrical energy, employing Swiss capital. In 1924 is founded The Company of Electricity Transylvania, which mainly deals with the power transport and distribution in the south of Transylvania.
In 1956 begins the rehabilitation activity of the power transformers; the first one being a 20 MVA, 110/5.5 kV transformer, manufactured by VEM - Germany. In April 1993, RETRASIB separates from the Ministry of the Electrical Energy and becomes a joint stock state-owned company. At this moment, S.C. RETRASIB S.A. has 546 employees.Starting from 1999 RETRASIB S.A. is a full private joint-stock company. In 2008 the board of directors decides to extend the company's area of activity by creating the technological conditions in order to manufacture transformers and autotransformers of rated powers up to 600 MVA and rated voltages up to 500 kV. The manufacturing of the power transformers according to the up-to-date technical standards requires modern and clean production spaces, high performance machines tools and highly skilled workers. This is the reason why, starting from 2008, S.C. Retrasib S.A. starts the modernization works reflected on workshops and also in the manufacturing process itself.
Nowadays, the company is able to manufacture any kind of equipment within the above mentioned power and voltage ranges. In 2010 RETRASIB held a share of 70% of the power transformer market in Romania. Starting from June, 2011 RETRASIB SA is listed at Bucharest Stock Exchange