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1933
The founding year of ETRA 33, Energetski transformatorji, d.o.o.. Its initial activity includes the servicing of small transformers and manufacturing of components for power distribution.

1949
The plant changes its name to Elektromehanične delavnice Črnuče and becomes an independent company. Its business activities are focused on the maintenance of electro power equipment.

1951
The company changes its name to Jambor.

1954
The first transformer, which is entirely the result of our own knowledge, is developed.

1960
The extent of production, which is growing annually reaches a total of approximately 130 MVA transformers per year.

1961
Jambor merges with Energoinvest group from Sarajevo. The company trades under the name Energoinvest Sarajevo, Tovarna transformatorjev Ljubljana. Its activity is exclusively dedicated to manufacturing power transformers.

1965
By acquiring a 10-year license from a French company Alsthom Savoisienne, and building new facilities, the company develops the capacity to produce transformers of up to 150 MVA rated power and of 145 kV rated voltage.

1966
A new plant is built on the location where the present headquarters of the company is situated. Annual production reaches a total of 423 MVA transformers.

1969
Growing manufacturing capacities generate further expansion of production up to an annual total of 1282 MVA transformers.

1980
A new high-voltage laboratory is built, enabling the testing of transformers of up to 245 kV rated voltage. The first transformer of 220 kV rated voltage is developed entirely as a result of our own knowledge.

1990
As a consequence of political and economic changes in 1990-1991, we suffered a decline in production and a decrease in the number of employees. Subsequently, the sales activities focus on the markets of Western Europe and the company revives its servicing activities.

1997
The company starts to operate as a joint-stock company with limited liability under a new name - ETRA 33 Energetski transformatorji, d. d., Ljubljana. Obtaining ISO 9001 Certificate validates our unremitting efforts to maintain high quality standards.

2000
Enduring commitment to maintaining high quality standards is rewarded by acquiring the ISO 14001 Certificate.

2002
The company attains an updated Quality Certificate ISO 9001:2000. Annual production of transformers exceeds 1250 MVA with 140 employees.

2003
The company celebrates its 70th anniversary. Annual production of transformers goes up to 1500 MVA with 160 employees.

2004
Annual production of transformers rises above 1700 MVA. The first rectifier transformer of up to 63 MVA rated power and 112 kV rated voltage with 66kA output is developed entirely as a result of our own knowledge.

2006
Company acquires a Health, Safety and Environment certificate - OHSAS 18001:1999. Annual production exceeds 2300 MVA.

2008
We produced the biggest transformer so far: 200 MVA rated power and voltage ratio 116/18 kV.
Annual productin exceeds 3000 MVA.

2010
Company ETRA 33 becomes a part of KOLEKTOR group and changes its name into KOLEKTOR ETRA d.o.o.

2012
The new production facility specialized in production of power transformers up to 500 MVA rated power and 420 kV has been opened. The first 350MVA/420kV transformer has been produced and successfully deliverd to the customer.