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Renovation of switchgear of Paljassaare 110kV substation


Civil engineering

Energy supply

Concrete works


Description of work




Construction of the substation took place in restricted spaces, near a working substation, and the entire substation was built on wedge-shape piles due to the complex geological soil conditions. The substation construction works included installation of 110 kV overhead power lines up to dead-end towers, and delivery and installation of a new 110 kV switchyard. New relay protections as well as automation and auxiliary voltage devices were installed in a newly built control building. A new auxiliary equipment building for Elektrilevi was also built and tied to an existing relay protection system.

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.

Elering AS
Name of the project:
Renovation of switchgear of Paljassaare 110kV substation
Energy supply
Type of construction:
AS Merko Infra and AS Merko Ehitus Eesti
Description of work:
Paljassaare, Tallinn
Beginning of the project:
Year of completion:

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