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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. Throughout this time we have been ensuring that electric power serves Slovenians and leads consistently toward development. We started as pioneers of progress serving the people by installing Slovenia’s very first public lighting at the end of the 19th century, and today we continue to innovate, literally powering the development and establishment of electric mobility.

History

 

Tradition for the future

  • 1896

    Start of the company's activities

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

  • 1898

    The electrification of Ljubljana begins

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

  • 1903

    Commencement 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 lighting 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 lighting when separating coal and for powering the narrow-gauge railway. The generators were connected by a transformer and a 700-metre long open loop duct. The Trbovlje coal mining group (TPD) also commenced electrifying of mining villages, which started to be considered as part of the group due to the Group not having a concession for the public distribution of electricity.

  • 1909

    Start of the electrification of the Dolenjska region

    Electrification of the Dolenjska region began 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 remaining buildings in Trbovlje, the municipality set up a cooperative, which in 1913 built a power plant with a power of 2 x 25 kW, a voltage of 2 x 150 V, and an accumulator battery. Public electrification was thereby established in Trbovlje and electric power also reached houses that did not form part of the 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 supply of electricity 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 by the German occupier.

  • 1947

    Direct current is abandoned in MEL

  • 1958

    Trams are phased out in Ljubljana and MEL  slows down. In the early 1960s, the Heat Production Plant takes over providing electricity for Ljubljana.
    Trams are phased out in Ljubljana and MEL is slowed down

  • 1963

    New electricity distribution companies are established pursuant to new laws, transforming Elektro Ljubljana City, Elektro Ljubljana Environs, Elektro Kočevje, Elektro Novo Mesto, and Elektro Trbovlje, which were previously independent companies, into 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

    The business information system starts to be implemented

  • 1973

    Beginning of the transition from 10 kV to 20 kV voltage
     

  • 1976

    Introduction of remote plant control

  • 1978

    Neutral point grounding in medium-voltage begins

  • 1980

    Start of introducing computer processing in management centres

  • 1988

    Beginning of the integrated information centre

  • 1988

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

  • 1991

    Digital systems start being implemented within remote controlling.

  • 1992

    Installation 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 into use
    Universal medium-voltage conductor cables come to use

  • 2000

    The beginning of data transfer via optical fibres 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 the engineering of renewable sources. Today, it operates 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 is fully open, allowing every citizen to freely choose their electricity supplier

  • 2007

    Commencement of neutral-point indirect grounding through resonant inductor implementation

  • 2010

    The first electric vehicle charging station is installed.
    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. The subsidiary Elektro energija, d. o. o. starts fully functioning on 1 December 2011.
     

  • 2014

    The first virtual power plant acts in the electric power system. This allows adjusted consumption services and accelerated production to be implemented with the help of industrial customers without risking overloads in the distribution network. The virtual power plant reduces the network load without  investments, while the service can also be used to optimise a supplier's portfolio.
    The first virtual power plant acts in the electric power system

  • 2014

    Devastating sleet in February affected over 400 km of the network with over 100,000 customers in the area covered by Elektro Ljubljana remaining without power. More than 1,750 power lines were damaged. More than 500 Elektro Ljubljana workers helped respond to the consequences of the natural disaster, doing their best to re-establish power to customers within 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 us to consolidate our leading position in the Slovenian energy market in the long term and to maintane our excellent levels of customer service.

    Merging Elektro energija with GEN-I

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