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Tradition for the future

120 years of positive energy

The Elektro Ljubljana Group has been technologically advanced from day 1, and has remained at the top ever since. Through all this time we keep on making sure that electric power serves Slovenians and leads unwaveringly toward development. We started as pioneers of progress that serves the people with the installation of Slovenia’s very first public lightning at the end of 19th century, and have continued innovating up to the present day, literally powering the development and establishment of electric mobility.

History

 

Tradition for the future

  • 1896

    Beginning of the company's activities

    By building water and power plant in Kočevje the town was provided with drinking water and electric power. The start of electric power in the town, produced by the Rinža river, was the start of the public electric power network and the birth of public electricity use in Slovenia. 
    Beginning of the company's activities

  • 1898

    Start of the electrification of Ljubljana

    On 1 January 1898 Ljubljana shined in a new light, thanks to the first electric lamps. Ljubljana got its own thermal power station that was owned by the municipality and was therefore public, in contrast to industrial power plants. The electricity produced by Ljubljana City Power station (Mestna elektrarna Ljubljana) was used mostly for public lightning; it was comprised of 794 light bulbs and 48 arc lamps. Electric lightning was introduced to public buildings as well, while the rest of the city’s electrification took longer to implement.
    Start of the electrification of Ljubljana

  • 1903

    Begining of the electrification of the Zasavje region

    In 1890 a watchman from Trbovlje created a simple electrical dynamo and tested it on a steam-powered sawmill used in a mine. In 1903 Trbovlje's coal mining groups installed electric lightning in two mine passages and started driving ventilators on the Gvido dynamo. In 1904 they added two more generators: one steam-powered sawmill in the central mining workshops and the other by the separation of coal, which was powered by a steam locomotive. This generator was used only for providing electric lightning when separating coal and for powering the narrow-gauge railway. The generators were connected through the transformer and 700-meter long open loop duct. The Trbovlje coal mining group (TPD) also started with the electrification of mining villages, which started to be considered as part of the group, due to lack of the Group's concession for the public distribution of electrical power.

  • 1909

    Start of the electrification of the Dolenjska region

    Electrification of the Dolenjska region started when Franc Seidl and Josip Košiček built a small 50 kVA power station and a 3kV transmission line to a hospital in the town of Novo Mesto.
    Start of the electrification of the Dolenjska region

  • 1913

    Building of the cooperative power plant in Trbovlje (Zadružna elektrarna v Trbovljah)

    To electrify the rest of the buildings in Trbovlje the municipality set up a cooperative, which in 1913 built a power plant with power of 2 x 25 kW, voltage of 2 x 150 V, and an accumulator battery. That way public electrification was established in Trbovlje and electric power also reached the houses that weren't a part of mining complex.
    Building of the cooperative power plant in Trbovlje

  • 1925

    At the Ljubljana City Power Station in Ljubljana (MEL) two motors start producing alternating current besides direct current, thus ensuring a three-phase current.
    Three-phase current

  • 1939

    MEL takes over the Electric Cooperative in Šiška and unifies the electricity supply in Ljubljana. 

  • 1941 - 1945

    Activities slow down, with only two transformer stations being built. During the war the power plant is handed over to an Italian officer, while the distribution transformer station in Črnuče and the hydropower plant in Česenj are held under German occupation.

  • 1947

    Direct current is abandoned in MEL.

  • 1958

    Trams are phased out in Ljubljana and MEL is slowed down. With the beginning of the 1960s the Heat Production Plant takes over providing electricity for Ljubljana.
    Trams are phased out in Ljubljana and MEL is slowed down

  • 1963

    With new laws new electric power distributing companies are established, making Elektro Ljubljana City, Elektro Ljubljana Environs, Elektro Kočevje, Elektro Novo Mesto, and Elektro Trbovlje, which were previously independent companies, become new business units of Elektro Ljubljana.

  • 1966

    Start of transition from 35 kV to 110 kV voltage.
    Start of transition from 35 kV to 110 kV voltage

  • 1966

    Introduction of a secondary protection system.
    Introduction of a secondary protection system
     

  • 1968

    Implementation of the business information system begins.

  • 1973

    Start of transition from 10 kV to 20 kV voltage level.
     

  • 1976

    Implementation of  remote plant control.

  • 1978

    Neutral point grounding in medium-voltage begins.

  • 1980

    Start of introducing computer processing in management centers.

  • 1988

    Beginning of the integrated information center.

  • 1988

    Based on the privatization of state assets, the public company becomes a joint-stock company, with the majority shareowner being the State.

  • 1991

    Digital systems start being implemented into remote controlling.

  • 1992

    Implementation of single medium-voltage collectors in substations.

  • 1993

    Introduction of covered conductors.
    Introduction of covered conductors

  • 1997

    Start of network tone controls at the 110 kV level.
    Start of network tone controls at the 110 kV level

  • 1999

    Universal medium-voltage conductor cables come to use.
    Universal medium-voltage conductor cables come to use

  • 2000

    The beginning of data transfer through optical fibers wrapped around overhead-line 110 kV conductors.
    The beginning of data transfer through optical fibers wrapped around overhead-line 110 kV conductors

  • 2002

    Founding of the Elektro Ljubljana Group’s Small Hydropower Plants, which cover renewable sources engineering. Today they operate as a subsidiary of Elektro Ljubljana, under the name Elektro Ljubljana OVE, d. o. o.
    Founding of the Elektro Ljubljana Group’s Small Hydropower Plants

  • 2007

    The electricity market opens completely, allowing every citizen to freely choose their electricity supplier.

  • 2007

    Beginning of neutral-point indirect grounding through resonant inductor implementation

  • 2010

    First electric vehicle charging station is being placed.
    First electric vehicle charging station is being placed

  • 2011

    To separate network and retail operations the process of purchasing and selling electricity is taken over by a new company. On 1 December 2011 the subsidiary Elektro energija, d. o. o. starts fully functioning.

  • 2014

    The first virtual power plant acts in the electric power system. This allows for the implementation of adjusted consumption services and accelerated production with the help of industrial customers without the risk of overloads in the distribution network. The virtual power plant reduces the network load with no investments, while the service can also be used to optimize a supplier's portfolio.
    The first virtual power plant acts in the electric power system

  • 2014

    February sleet affected over 400 km of network and over 100.000 customers in the area of Elektro Ljubljana remained without power. More than 1.750 power lines were damaged.

    Over 500 workers of Elektro Ljubljana participated in response to the consequences of the natural disaster, giving all their best to re-establish power supply to the customers in the shortest time possible.

    2014  February sleet

  • 2015

    Electricity storage is installed as the first battery system in the electricity distribution network.

  • 2016

    Merging Elektro energija with GEN-I

    The merger of our subsidiary Elektro energija with the best strategic partner allows a long-term consolidation of a leading position on the Slovenian energy market and preserving excellent service to our customers.

    Merging Elektro energija with GEN-I

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