Estonia

  • Anne 110 kV substation

    The renovation of the switchgear of Anne 110 kV substation was necessary mainly due to the incorporation of the Fortum power plant. The complete engineering design was ordered from Merko headquarters: construction relied on the construction department, and the primary and secondary electrical design on the designers from the electrical works department. Anne substation was …

  • Ülemiste 110 kV GIS substation

    Nearly simultaneously with the renovation of the substation, the customer also intended to build a 110 kV cable line between the Ülemiste and Lasnamäe substations in order to ensure better energy security to the region. The existing 110 kV switchgear was an AIS (air insulated switchgear). According to the procurement documentation, the new switchgear would …

  • Connecting the Vaivara wind farm to the Balti 330 kV substation

    On 1 July 2021, Merko Ehitus Eesti acquired a stake in Connecto Eesti, and the Merko electrical construction business line merged with Connecto. Acting jointly under the Connecto brand makes it possible for us to offer a significantly broader range of services – in addition to the design, construction and maintenance of low, medium and high voltage …

  • Põlva 110 kV substation

    Põlva substation is a standard 110 kV substation comprising two 110/35/10 kV power transformers and three 110 kV overhead transmission line columns. This renovation project was especially interesting but also complex due to the need to connect circuits to the old substation that is still partly functioning. In addition to the construction of the substation, …

  • 110 kV cable of Ülemiste traffic junction

    The 110 kV double circuit line between Ülemiste and Järve substations was replaced with a cable line from Ülemiste substation to mast No 22. The total length of the line is 2.8 km, 2.2 km of which was installed using the opened method and 0.6 km using the closed method. The line was divided into …

  • Volta 110 kV substation

    The reason for the Volta substation reconstruction was depreciated equipment and to some extent also the need to replace old Volta-Ranna 110 kV oil-filled cables. According to the reconstruction plan, the 6 kV substation of Eesti Energia Jaotusvõrk and the 10 kV substation of Elering that were previously on two separate registered immovables were combined …

  • Electrical heating system of Enefit-280 condensation area

    The Enefit-280 shale oil plant is more reliable and more powerful than the last one. The condensation area’s electrical heating system is part of the new generation technology and was developed in cooperation with international engineering companies Neste Jacobs and Tyco Rychem. The Enefit-280 technology based plant’s condensation area has pipes and equipment that are …

  • Power supply for Enefit’s turbine hall

    Eesti Energia Õlitööstus is building a new oil plant based on Enefit280 technology that is going to be environmentally friendlier, more reliable and more powerful. The new generation technology used was developed as a joint venture by Eesti Energia and the international engineering company Outotec. The works comprised the construction of support systems for cables …

  • Enefit-280 internal installation works

    Installation of cableways for cables exiting the turbine hall on pipe gantries. Installation of medium-voltage transformers and switchgear, cable connections and cable ducts in the turbine hall. General power supply and low-voltage switchgear and cableways for technological equipment, UPS power, guaranteed power grid, 110 VDC power. Completion of the earthing system between turbine hall and …