Estonia

  • Enefit-280 electrical supply of fuel feed system

    Completion of the technical solution for medium voltage systems and low voltage main circuit in 2 substations. Installed capacity 8 MW. 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 …

  • Cable line and internal power network for Helme Energia´s 110 kV substation

    Graanul Invest, a producer of pellets used for heating, built a combined heat (15 MW) and power (6.5 MW) plant in Patküla, Valgamaa. Merko’s job was to connect the new combined plant with Elering’s 110 kV network, and to build a 15 kV internal power network for the plant. We built a (15 kV) cable …

  • Construction of Kiisa substation 10kV, 110kV and 330kV connection points

    The goal of the expansion of the 330/220/110/35/10kV Kiisa substation, fully renovated in 2010, was to establish connections for the new 250 MW Kiisa emergency power plant. The contract called for one 330kV duplex cell, one 110kV simplex cell and two 10kV local power plant cells to be designed and constructed. The new power plant …

  • Aruküla 300/110/20 kV substation

    The reason for building a new 330/110/20 kV substation in Aruküla was a fully depreciated old 220/110/10 kV substation. The old Aruküla substation was the only unrenovated substation powering Tallinn. It was a turnkey project which means that scope of the contract includes design work, delivery, installing and setup of all devices, adjustment works, etc., …

  • Connection of Sillamäe TPS at Sillamäe 110/6 kV substation

    The construction of the new Sillamäe 110 kV substation was occasioned by the desire to increase power generation. Merko offered turnkey delivery, meaning that all of the equipment within the project were delivered along with design work, installation, configuration and validation and handed over to the customer fully hooked up and on line. Merko supplied …

  • IRU WTE high and medium voltage systems

    The work involved the design and construction of the WTE plant’s 110 kV connection to Iru substation, and the delivery and implementation of a 110/10 kV 27.5 MW step-up transformer. In addition, 10 kV switchgear with seven bays, three transformers for the plant’s own use and the strong and weak-current connections between all equipment, including …

  • Tamsalu 35/10 kV substation

    The purpose of expanding Tamsalu city’s 35/10 kV substation, completely renovated in 2013, was to increase the reliability of electricity supply in the area. The contract called for design-build of 35 kV and 10 kV switchgear and two 10 kV bays for the substation’s own use and arc extinguishing chamber. The construction took place in …

  • Estlink 2 underground cable

    Estlink 2 is the second direct current connection between Estonia and Finland, which effectively trebles the transmission capacity between the Baltics and Nordics and which means that Estonia and Finland have become a single market area. The capacity of Estlink 2 is 650 MW, which allows covering half of the electricity needed by Estonia in …

  • Partial renovation of switchgear of Paide 330kW substation

    Partial renovation of the 330 kV switchgear at Paide substation took place over two years, as it was possible to schedule the necessary power cuts in the important 330 kV power grid only in the summer 2012 and 2013. The partial renovation took place in complicated conditions on the territory of a substation with live …

  • 330kV overhead line to the Eesti power plant’s new energy unit

    The overhead line built in spring 2014 to Narva’s new 300MW power plant and the freshly renovated Aruküla 330/110 kV substation ensures that the energy unit is connected to the Estonian power grid. The project also included design, two double-circuit high-voltage aerial pylons with foundations, and wiring work, including laying optic cable. The design part …