Comprehensive modernization of Mainskaya HPP is completed

Replacement of hydraulic power unit No. 2 was completed at Mainskaya HPP. This is the last of three hydraulic power units at the plant that were upgraded under RusHydro's Program for Comprehensive Modernization of Hydroelectric Power Plants.

Hydraulic turbines for units No. 1, 2, 3 were designed and manufactured by Leningradsky Metallichesky Zavod (a part of JSC "Power machines"). The company also provided supervision of the equipment installation.

Among the features of the new turbines is the use of modern antifriction material in the bearing units, eliminating the need for lubrication during operation. In addition, the new design of the upper ring will allow HPP personnel to replace bearings and sealing elements of the lower blade trunnions without complete disassembly of the unit, increasing repairability and reducing the customer's costs for unit maintenance.

As a result of the project, the efficiency of the hydro turbines was increased and the capacity of each of them (at maximum head) increased from 110 MW to 113.5 MW.

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Mainskaya HPP is located on the Yenisei River in Khakassia, downstream of Russia's largest hydroelectric power plant, Sayano-Shushenskaya HPP, and serves as its counter-regulator. The Mainskaya HPP reservoir regulates water level fluctuations that occur during regime changes at Sayano-Shushenskaya HPP. Thus, the most powerful HPP in Russia can change its capacity in accordance with the needs of the power system without consequences for downstream water users. The installed capacity of Mainskaya HPP is 321 MW. In total, since its commissioning, Mainskaya HPP has generated more than 50 billion kWh of renewable electricity.