Large-scale commissioning operations are being conducted at the Leningrad nuclear power plant. They require full power supply. Therefore, a key task for the experts from JSC «SEM» is providing auxiliary power supply from 330 kV network.

At present a 110/10 kV substation is feeding all construction facilities. During the future NPP operation it will play a role of standby substation.  As the power consumption of construction has been constantly growing, the capacity of this substation is no longer sufficient.

The power will be supplied using the 330 kV network from the substation “Gatchinskaya”. Connection to the network is planned in the end of December. The corresponding application has been filed in the Leningradskoye regional supervisory department.

At present JSC «SEM» prepare the equipment for its connection to the network. They are tasked to complete the assembling works for the entire power distribution scheme. This includes 330 kV GIS, auxiliary transformers, a building of auxiliary switchgear and a building of relay panels. Most of the equipment has already been transferred to commissioning.

The test voltage will last for 72 hours. It is the period of time during which the electrical installations to be connected shall undergo the operating voltage test.

When the auxiliary power is energized from 330 kV network, the existing 110/10 kV substation will be put on standby.


The Holding “Titan-2” is the largest in the North-West group of companies, erecting the most important objects of the nuclear industry and energy. The organization performs a full range of construction and installation works from engineering to commissioning.

The Holding “Titan-2” is one of the main contractors for the construction of power units No. 1 and No. 2 of the Leningradskaya NPP-2. Main organizations of the company perform 30% of general construction and 80% of installation works on the site. Specialists of the holding are engaged on the objects of the Leningradskaya NPP-2 first and second power units. The works are being performed in the buildings of the reactor, turbine, electricity, water, heating system and other structures of power units.