Modern modernization of hydroelectric power plants – increasing efficiency and safety


Modernizing Soviet hydroelectric power plants helps maintain energy independence by transforming an outdated legacy into a modern and reliable power grid backbone. In the CIS countries, many hydroelectric power plants from the 1950s to 1980s still provide a significant portion of electricity. However, these plants require modernization to improve efficiency and operational safety.

Why is modernization important?

  • Energy losses. Old turbines operate with reduced efficiency, leading to inefficient use of water resources.
  • Outdated automation. Control is often manual or based on outdated analog systems.
  • Decreased reliability. Wear and tear on mechanical components and frequent accidents increase risks and downtime.

What does modernization provide?

  • Efficiency increased by up to 15–20% thanks to new turbines and digital control systems.
  • Increasing the service life of equipment by at least 20–30 years.
  • Implementation of digital control and automation using SCADA and remote monitoring.
  • Environmentally friendly: modern technologies reduce water loss and minimize the impact on the ecosystem.

How does the process work?

A company like HydroTechnology begins with a station survey, including a review of archival documents and a technical audit of the equipment's condition. Then, a modernization project is developed, including the selection of turbines and control systems, and the load and implementation timeline are calculated. Once the project is approved, the equipment is manufactured in Austria, delivered, supervised installation, and commissioned. The entire process is completed with minimal customer involvement and is implemented on a turnkey basis.

Thus, the modernization of Soviet hydroelectric power plants is becoming a key step in strengthening the energy independence of CIS countries and the transition to a sustainable, modernized energy system of the future.

Which specific turbines improve the efficiency of Soviet hydroelectric power plants?

To increase the efficiency of Soviet hydroelectric power plants, modern turbines of the following types are often used during modernization:

  • Francis-type radial-axial hydroturbines. These turbines offer a wide range of operating heads (from 10 to 700 m) and are capable of delivering high efficiency thanks to optimized blade geometry. They are used to replace older Kaplan turbines, significantly improving plant efficiency.
  • Diagonal (cross) turbines. They offer high average efficiency across various operating modes, increasing the overall performance of hydroelectric units and allowing their use in variable pressure conditions.
  • Kaplan turbines with adjustable blades provide the ability to optimize the operating mode when changing the water flow and pressure, which also contributes to increased efficiency.

Modern turbines come with software for precise tuning and control, which further improves the overall operating efficiency of the power plant.

Thus, the use of modern radial-axial, diagonal and Kaplan turbines significantly increases the efficiency of Soviet hydroelectric power plants and increases their service life and operational reliability.

Which specific turbines improve the efficiency of Soviet hydroelectric power plants?

To increase the efficiency of Soviet hydroelectric power plants, modern turbines of the following types are often used during modernization:

  • Francis-type radial-axial hydroturbines. These turbines offer a wide range of operating heads (from 10 to 700 m) and are capable of delivering high efficiency thanks to optimized blade geometry. They are used to replace older Kaplan turbines, significantly improving plant efficiency.
  • Diagonal (cross) turbines. They offer high average efficiency across various operating modes, increasing the overall performance of hydroelectric units and allowing their use in variable pressure conditions.
  • Kaplan turbines with adjustable blades provide the ability to optimize the operating mode when changing the water flow and pressure, which also contributes to increased efficiency.

Modern turbines come with software for precise tuning and control, which further improves the overall operating efficiency of the power plant.

Thus, the use of modern radial-axial, diagonal and Kaplan turbines significantly increases the efficiency of Soviet hydroelectric power plants and increases their service life and operational reliability.

Abzal Turlin
Abzal Turlin
I, Abzal Turlin, founded AsumB with a clear goal - to promote clean, affordable and efficient energy in Kazakhstan, Central Asia, Armenia, Azerbaijan, Georgia, Ukraine, Russia, Belarus, Uzbekistan, Kyrgyzstan, Tajikistan.
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01
Pobreg (Small Unit), Albania — 2012

Pobreg (Small Unit), Albania — 2012

Integrated Supply of Equipment for a High-Head Mini-HPP In 2012, our company completed the supply of a full set of hydropower equipment for the Pobreg Small Unit station in Albania. The project was implemented on a complex high-pressure section and required precise engineering adaptation to the channel parameters and the customer’s operational requirements. Scope of Supply Francis turbines (2 pcs.) Synchronous generator Hydraulic Power Unit Inlet Valve Control system and electrical equipment The complete set of equipment ensured optimal operation of the units under variable water conditions and high reliability requirements. Technical parameters of the station Number of units: 2 Installed capacity: 7,750 kW Static head: 96.6 m Design flow rate: 4.0 m³/s Runner diameter: 670 mm Project outcome The high-pressure arrangement with Francis turbines made it possible to achieve stable power generation and high efficiency of the plant at variable flow rates. The automation and control system ensured precise control of the plant's operating modes and minimal operating costs. The Pobreg Small Unit project became an example of the successful implementation of a compact yet powerful hydropower solution for Albania's mountainous regions.
Number of devices : 2
Total power (kW) 7750
Static pressure (m) 96.6
Estimated flow rate (m3/s) 4
Impeller diameter (mm) 670
02
Haut Bens Hydroelectric Power Station, France – 2020

Haut Bens Hydroelectric Power Station, France – 2020

High-Head Hydroelectric Power Plant with a Pelton Turbine for Mountain Conditions In 2020, our company supplied equipment for the Haut Bens hydroelectric power plant in France. The plant is located on a high-pressure mountain stream, which requires maximum reliability and precision in the turbine complex. Scope of supply: Pelton Turbine, Hydraulic Power Unit (HPU), Synchronous Generator. The Pelton turbine is an optimal solution for extremely high heads and relatively low flows, ensuring stable efficiency and a long service life. Project Specifications: Number of units: 1 Installed capacity: 1,805 kW Static head: 255.7 m Design flow rate: 0.8 m³/s Runner diameter: 645 mm Engineering Result: The high-head configuration with a Pelton turbine efficiently converts the energy of a narrow but powerful mountain stream into stable electrical generation. Precision hydraulics and a modern control system ensure precise jet control, minimal vibration, and a long equipment lifespan. The Haut Bens project has become a model for a compact, efficient, and reliable solution for high-altitude hydropower projects in France.
Number of devices : 1
Total power (kW) 1850
Static pressure (m) 255.7
Estimated flow rate (m3/s) 0.8
Impeller diameter (mm) 645
03
Obuse Hydroelectric Power Station, Japan – 2018

Obuse Hydroelectric Power Station, Japan – 2018

A modern small hydropower plant for the mountainous Nagano region. In 2018, our company supplied a complete equipment package for the Obuse project in Japan. The facility is located in Nagano Prefecture, known for its challenging mountainous terrain, seasonal fluctuations in water flow, and stringent seismic safety requirements. The project became an example of adapting European hydraulic engineering solutions to Japanese reliability and control standards. The scope of supply included: Hydroturbine unit (the type of supply depends on the Obuse project's watercourse characteristics), Synchronous generator, Control system and power equipment, Hydraulic power unit (HPU), Inlet shutoff valves. The package was adapted to local requirements for safety, automation, and remote control access. Technical parameters of the facility (Please provide them if you wish – I can add actual data if you send them.) Number of units: 1 Capacity: TBA Static head: TBA Flow rate: TBA Impeller diameter: TBA Engineering result: The Obuse project demonstrates a compact approach to small hydropower, combining high automation, stable generation, and minimal maintenance requirements. The use of European equipment ensures high efficiency and reliable operation under conditions of significant seasonal fluctuations in water flow.
Number of devices : 1
Total power (kW) 196
Static pressure (m) 14/4
Estimated flow rate (m3/s) 1/5
Impeller diameter (mm) 620
04
La Yeguadita Hydroelectric Power Station, Panama – 2018

La Yeguadita Hydroelectric Power Station, Panama – 2018

The La Yeguadita project in Panama exemplifies the implementation of modern small hydropower in challenging terrain and demanding reliability. The project included the delivery and integration of a complete process line: turbine, generator, hydraulic power station, control system, SCADA, medium-voltage equipment, and a power transformer. This comprehensive solution ensured stable and efficient power generation throughout the entire operational period. Plant parameters: Number of units: 1 Installed capacity: 886 kW Static head: 48.6 m Design water flow: 2.0 m³/s Runner diameter: 570 mm The plant is equipped with a modern automated control and remote monitoring system, which improves control accuracy, minimizes equipment downtime, and ensures high plant availability.
Number of devices : 1
Total power (kW) 886
Static pressure (m) 48
Estimated flow rate (m3/s) 2
Impeller diameter (mm) 570
05
Bodorna Hydroelectric Power Station, Georgia – 2018

Bodorna Hydroelectric Power Station, Georgia – 2018

The Bodorna hydropower project in Georgia was implemented using a full package of equipment, ensuring high reliability and uninterrupted operation of the plant at high flow rates. The supply included a turbine, generator, hydraulic power station, control system, SCADA, medium-voltage equipment, and a power transformer. The plant is also equipped with a diesel generator for independent start-up and backup power supply, which is especially important for facilities with high loads and unstable external grids. Plant parameters: Number of units: 1 Installed capacity: 2,556 kW Static head: 8.1 m Design water flow: 32.0 m³/s Impeller diameter: 2,240 mm The plant is designed to operate at low heads and very high flow rates, making it an effective solution for rivers with wide channels and strong flow regimes. Full automation and a SCADA system ensure real-time parameter monitoring and high generation quality.
Number of devices : 1
Total power (kW) 2556
Static pressure (m) 81
Estimated flow rate (m3/s) 32
Impeller diameter (mm) 2240
06
ASUMB Clywedog, UK – 2017

ASUMB Clywedog, UK – 2017

The Clywedog project in the UK utilizes a Kaplan tubular turbine, optimized for low-head operation with stable water flows. The equipment supplied included the turbine, generator, vacuum pump, hydraulic power unit, and control system. This combination ensures high efficiency, stable operation, and precise control of the hydroelectric unit, even under variable river conditions. Plant parameters: Number of units: 1 Installed capacity: 108 kW Static head: 6.0 m Design flow rate: 2.0 m³/s Runner diameter: 630 mm The automated control system ensures load optimization and stable operation, which is especially important for small hydroelectric power plants integrated into existing water management infrastructure.
Number of devices : 1
Total power (kW) 108
Static pressure (m) 6
Estimated flow rate (m3/s) 2
Impeller diameter (mm) 630
07
ASUMB Cutzán, Guatemala – 2017

ASUMB Cutzán, Guatemala – 2017

The Cutzán hydroelectric dam project utilized a high-head Pelton turbine—an optimal solution for regions with large elevation differences and limited water flow. The supply included a turbine, butterfly valve, hydraulic power station, generator, a set of power electrical cabinets, a control and protection system, and a SCADA system for remote monitoring and diagnostics. This equipment package ensures high efficiency, precise jet control, and stable generation at heads exceeding 160 meters. The SCADA system provides 24/7 monitoring of parameters, prompt detection of deviations, and ease of operation in remote areas. Station parameters: Number of units: 1 Installed capacity: 2,551 kW Static head: 160.2 m Estimated water flow: 1.8 m³/s Impeller diameter: 850 mm The project demonstrates the advantages of the Pelton turbine in high-pressure conditions - high energy output, reliability and a long, trouble-free service life with minimal operating costs.
Number of devices : 1
Total power (kW) 2551
Static pressure (m) 160.2
Estimated flow rate (m3/s) 1.8
Impeller diameter (mm) 850
08
ASUMB Hintergössgraben, Austria — 2017

ASUMB Hintergössgraben, Austria — 2017

The Hintergössgraben hydroelectric project, located in the Austrian mountains, is designed to efficiently generate power at high heads with relatively low water flow rates. The supply included a turbine, generator, inlet gate, hydraulic power station, and a bifurcation pipe ensuring optimal flow distribution. The turbine assembly used is designed for stable operation under variable mountain water flow conditions. A high head of over 110 meters and a precise control system ensure consistently high output and minimize energy losses. Reliable hydromechanics and a modern generator ensure a high degree of automation and low operating costs. Station parameters: Number of units: 1 Installed capacity: 1,035 kW Static head: 111.9 m Estimated water flow: 1.1 m³/s Runner diameter: 711 mm The Hintergössgraben project demonstrates the effectiveness of high-pressure turbine solutions for mountainous areas, combining compact equipment, reliability and a long service life.
Number of devices : 1
Total power (kW) 1035
Static pressure (m) 111.9
Estimated flow rate (m3/s) 1.1
Impeller diameter (mm) 711
09
Giorlandina Hydroelectric Power Station, Italy – 2017

Giorlandina Hydroelectric Power Station, Italy – 2017

The Giorlandina hydroelectric project is built on a low-head section and is equipped with two Kaplan turbines, specifically designed for operation at low heads and high flow rates. The supply package included the Kaplan turbines, generator design, and a hydraulic power plant. The 2,100 mm diameter Kaplan turbines provide high efficiency at heads of just 2.2 meters, making the design ideal for lowland rivers, lock canals, and urban hydraulic structures. A flexible blade adjustment system maintains stable generation even with significant fluctuations in water levels and flow rates. The installation of two units gives the plant additional versatility: during partial loads or seasonal fluctuations in water flow, one unit can be used as a backup without losing baseload power. Plant parameters: Number of units: 2 Installed capacity: 516 kW Static head: 2.2 m Design water flow: 16.0 m³/s Runner diameter: 2,100 mm The Giorlandina project demonstrates the effectiveness of Kaplan turbines in low-pressure areas: high flexibility, stable operation at high flow rates and minimal construction requirements.
Number of devices : 2
Total power (kW) 516
Static pressure (m) 2.2
Estimated flow rate (m3/s) 16
Impeller diameter (mm) 2100
10
ASUMB HPP Vordergössgraben Hydroelectric Power Station, Austria

ASUMB HPP Vordergössgraben Hydroelectric Power Station, Austria

The Vordergössgraben project, located in a high-pressure mountain area in Austria, is equipped with a single Pelton turbine, ideal for large elevation changes and limited water flow. The supply package included a Pelton turbine, generator, inlet gate, hydraulic power unit (HPU), and a bifurcation pipe, ensuring proper flow distribution within the turbine tract. The 901 mm diameter Pelton turbine operates at a head of 91.5 m, maximizing the kinetic energy of the water flow. Precise nozzle operation and a stable hydraulic system ensure high energy efficiency and minimal wear, even with seasonal flow fluctuations. The project features a compact design, reliable automation, and a high level of safety, which is particularly important for remote mountainous areas. Station parameters: Number of units: 1 Installed capacity: 1,405 kW Static head: 91.5 m Estimated water flow: 1.7 m³/s Runner diameter: 901 mm The Vordergössgraben project demonstrates the advantages of using a Pelton turbine in mountain conditions: high power at low flow, stable operation and minimal operating costs.
Number of devices : 1
Total power (kW) 1405
Static pressure (m) 91.5
Estimated flow rate (m3/s) 1.7
Impeller diameter (mm) 901
11
ASUMB Hydropower Station Rugezi, Rwanda — 2016

ASUMB Hydropower Station Rugezi, Rwanda — 2016

The Rugezi hydropower project is equipped with two high-head Francis turbines, designed to operate at high heads and relatively low flow rates. The delivery included the Francis turbines, butterfly valves, hydraulic power units (HPUs), generators, a control system, and a SCADA platform for remote monitoring and diagnostics. The 425-mm-diameter Francis turbines are ideally suited to the local hydrotopography: a high head of 135 meters provides sufficient kinetic energy for stable generation, and the runner design allows for efficient use of the resource even with seasonal fluctuations in water levels. An integrated SCADA system provides full control of each unit, including automatic synchronization, load regulation, fault protection, and real-time parameter analysis—a critical aspect for remote areas of Rwanda. Plant parameters: Number of units: 2 Installed capacity: 2,756 kW Static head: 135.0 m Design water flow: 1.2 m³/s Runner diameter: 425 mm The Rugezi project demonstrates the effectiveness of high-head Francis turbines in the highlands of Africa: high energy efficiency, reliability, automation and minimal operating requirements.
Number of devices : 2
Total power (kW) 2756
Static pressure (m) 135
Estimated flow rate (m3/s) 1.2
Impeller diameter (mm) 425
12
Supply of Kaplan turbines ASUMB United Kingdom

Supply of Kaplan turbines ASUMB United Kingdom

In 2016, ASUMB successfully delivered a hydropower project in Knottingley, UK, providing a full range of equipment for the small hydropower plant. The project was designed to utilize low heads and high flow rates, making it ideal for Kaplan turbines. The scope of supply included: 2 Kaplan turbines Generators Hydraulic Power Units (HPUs) Control system Electrical equipment Technical specifications of the facility: Number of units: 2 Installed capacity: 660 kW Static head: 2.6 m Water flow: 14.1 m³/s Runner diameter: 1,850 mm The Knottingley project demonstrates the high efficiency of ASUMB Kaplan turbines in low-head applications and highlights the reliability of Austrian equipment for year-round operation.
Number of devices : 2
Total power (kW) 660
Static pressure (m) 2.6
Estimated flow rate (m3/s) 14.1
Impeller diameter (mm) 1850
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