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


Civil engineering

Energy supply

Concrete works


Description of work




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 line of about 4 km that transfers green energy produced in the new combined heat and power plant to Elering’s network, and installed a 10 MVA step-up transformer at the supply point. The new combined heat and power plant was connected with the power Network in August 2012.

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 electricity networks, Connecto also operates in the field of telecommunications and gas networks.

View the works performed by Connecto.

OÜ Helme Energia
Name of the project:
Cable line and internal power network for Helme Energia’s 110 kV substation
Energy supply
Type of construction:
Description of work:
New building
Kirikuküla and Patküla, Helme, Valgamaa
Beginning of the project:
Year of completion:

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