Service Lane Renovation Commenced at TGC-1’s Verkhne-Svirskaya HPP


They have commenced service lane renovation at the Verkhne-Svirskaya HPP of TGC-1 PJSC. The first phase will include underwater work to restore the load carrying capacity of the service lane supports.

“The service lane was not originally designed for the traffic of heavy machines. The design envisaged a load capacity of 10 tonnes, while it has been used for the passage of 50-60 tonne vehicles for a long time. As a result, its structures have begun to deteriorate and now they have multiple defects. It is simply risky to shift the work to a later date,” says Dmitry Vidyakin, Director of the Ladoga HPPs Cascade, TGC-1 PJSC.

During the first phase, the engineers will disassemble and remove damaged concrete fragments from under the water, conduct underwater welding, restore reinforcements, place formwork and install metal frames; this will be followed by subaqueous concreting. In total, the divers will pour over 100 tonnes of the concrete mixture. The measures will restore the load carrying capacity of the hydropower unit.

As soon as the movement across the dam of the Verkhne-Svirskaya HPP is completely closed in March 2021, the engineers will begin dismantling the old service lane superstructures to replace them with the new ones and lay pavement on the service lane deck. These works will be completed in January 2022, while the service lane will be closed to traffic throughout the whole period.


Located on the Svir River in the town of Podporozhye, Leningrad Oblast, the Kazarov Verkhne-Svirskaya HPP was commissioned in 1953. Since January 2010, it has been part of the Ladoga HPPs Cascade (together with the Nizhne-Svirskaya HPP and Volkhovskaya HPP). Its installed capacity is 160 MW.

TGC-1 PJSC (part of Gazprom Energoholding Group) is the leading producer and supplier of electricity and heat power in the North-West of Russia. It comprises 52 power plants within four constituent entities of the Russian Federation: St. Petersburg, the Republic of Karelia, and Leningrad and Murmansk Oblasts.