Upgrade of Verkhne-Tulomskaya HPP

On 25 September 2018, the impeller of hydroelectric generating unit No. 4 was dismantled as part of the upgrade of TGC-1's Verkhne-Tulomskaya HPP.

Upgrade of Verkhne-Tulomskaya HPP

On 25 September 2018, the impeller of hydroelectric generating unit No. 4 was dismantled as part of the upgrade of TGC-1's Verkhne-Tulomskaya HPP.

The upgrade includes step-by-step replacement of hydro-generating and electric equipment with increase in capacity of each of the four hydroelectric generating units by 8 MW. Taking into account the importance of Verkhne-Tulomskaya HPP for Murmansk Oblast's energy system, high requirements were set for the project: the new equipment meets the modern standards for reliability, safety and ecology.

"The dismantling of the impeller is a landmark symbolising the beginning of a key stage of the project important for the Murmansk Oblast energy system. The most powerful Subarctic HPP will receive new equipment and new control technologies, which will improve its reliability and create additional capacities for the regional development," Igor Patsan, Director of the Tuloma and Serebryanskiye HPPs Cascade of TGC-1 noted. "At present, dismantling of the old equipment and delivery of the new equipment take place. The new impeller has already passed acceptance at the manufacturing plant."

Impeller excavation
Impeller weight: 43 tonnes

The dismantled impeller will become the basis for a monument on the territory of Verkhne-Tulomskaya HPP as a symbol of continuous renovation of TGC-1's power facilities.

Verkhne-Tulomskaya HPP

It is the most powerful hydroelectric power plant in the North-West region of Russia and one of five hydroelectric power plants in Russia with an underground HPP building.

The second power plant of the cascade, the underground Verkhne-Tulomskaya was built by the joint efforts of Russian and Finnish specialists. Before the construction of the HPP, the Tuloma river had a drop of 28 m on a section of 2.5 km. After the dam building and placing the turbine room underground, the water pressure was 60 m.

All 4 units of the HPP were put into permanent operation on 27 October 1965.

Initially, established capacity of Verkhne-Tulomskaya HPP was 228 MW, but it turned out that its turbines had a significant reserve of power. A range of works on upgrade of the generators and other equipment were carried out. As a result, the plant's capacity increased by 40 MW with no loading of new units.

Before 1975, the plant was a frequency regulator in the Kolsky power system. After connecting to the North-West interconnected power system, the role of Verkhne-Tulomskaya HPP changed. It began to regulate the flow of electricity to Karelia. Power transmission lines connect the HPP with Murmansk, settlements and enterprises of the Pechengsky District.

Verkhne-Tulomskaya HPP is special with its underground fish plant for growing rainbow trout placed next to the turbine room. This is an aquaculture enterprise specialising in trout breeding in the Far North conditions. The plant has existed since 1992 and uses the cleanest water-storage basin which does not have industrial emissions. The Finnish company A/O Atri constructed it.

The impeller of kaplan-type
The extracted impeller will become a monument on the HPP territory.

The plant is located underground at a depth of 50 m; on sections of the underground transport tunnel with a total length of 250 meters there is an incubation shop consisting of 28 pools where tiny fish is grown and a workshop of the breeder stock. When reaching a certain weight, tiny fish is sold to fish farms mainly in Murmansk Oblast and the Republic of Karelia.

The proven technology of mixing warm water from the HPP and cold water from the water-storage basin allows to create perfect conditions required for tiny fish breeding.

The HPP's installed capacity is 268 MW, long-term average electricity output is 861.4 million kWh.

Verkhne-Tulomskaya HPP plays a key role in the power system of Murmansk Oblast: it ensures electricity transmission to Karelia and serves as a reserve for the entire Northern energy district. Four hydroelectric generating units with a capacity of 268 MW were installed at the plant. In 2015, the Verkhne-Tulomskaya HPP upgrade project was considered one of the Company's high-priority investment projects.

The main objectives of the upgrade are out-of-date equipment replacement and increase of operating reliability with requirements to the HPP operation modes taken into consideration. Taking into account the importance of Verkhne-Tulomskaya HPP for the Murmansk Oblast power system, the highest requirements have been set for the project: the new equipment has to meet the modern standards for reliability, safety and ecology.

Materials on the topic

A new impeller has been delivered to Verkhne-Tulomskaya HPP

On 14 March 2019, a new impeller for hydroelectric generating unit No. 4 was delivered to Verkhne-Tulomskaya HPP. Hydroelectric generating unit No. 4 is the first unit to be upgraded.