Dafnosonara hydropower plant, Greece

Small hydropower solutions

The Compact Hydro Division is the world leader in products and services for small and medium-sized hydroelectric power plants.

Small-scale hydro power plants range up to an unit output of 15 MW for Axial and Kaplan turbines and an output of 30 MW for Francis and Pelton turbines.

Compact Hydro stands for “water to wire” solutions based on pre-designed modular components and offers a single source of supply for the entire electromechanical equipment, as well as workshop-tested units, reduced dimensions for transportation and short installation times. For Mini Compact Hydro the level of standardization and parametrization was deeper expanded, keeping the same level of performances and quality, for lower investment costs and simplifying operation and maintenance of small hydropower plants.

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Do you have questions, please send us an email or contact your nearest local ANDRITZ partner.

Features for small hydropower plants

Compact Hydro services include engineering, design, model testing, purchasing, manufacturing, assembly, project management, site management, installation, commissioning, testing, and staff training for all mechanical and electrical equipment:

  • Hydraulic turbines
  • Digital speed governors and HPUs
  • Shut-off valves
  • Synchronous and asynchronous generators
  • Automation, control, protection, excitation and synchronization equipment
  • Electrical power system

Axial units

All guarantees concerning efficiency, output and resistance to cavitations are backed up by model tests in the ANDRITZ Hydro laboratories for three to six bladed runners, double or single regulated, horizontal or vertical axis.

The axial flow turbines are based on a modular design concept with the same key components used for different turbine types.

  • Unit output up to 15,000 kW and heads up to 45 m
  • Belt driven bulb units for very low head application with a head up to 5 m and outputs up to 600 kW
  • Bevel gear bulb units for head up to 12 m and outputs up to 2,600 kW
  • Bulb units for a net head up to 15 m and outputs up to 15,000 kW
  • PIT units for a net head up to 12 m and outputs up to 10,000 kW
  • Compact Axial Turbine units (CAT) units for a net heads up to 45 m and outputs up to 15,000 kW
Schattenhalb 3 hydropower plant, Switzerland

Schattenhalb 3 hydropower plant, Switzerland

Francis units

The features of the Francis turbines ensure a wide application field according to specific needs. Guarantees of efficiency, output and resistance to cavitation for single and double discharge runners are based on model tests from the ANDRITZ Hydro laboratories.

Francis turbines propose the highest efficiency. As far as the standard concept is applicable, the runner is directly fitted on the generator shaft, which ensures a compact construction and low maintenance.

For smaller units the turbine-generator aggregate is delivered as a complete assembly package ready for immediate installation.

  • Mini hydro from 20 to 3,000 kW and heads from 10 to 150 m
  • Small hydro from about 500 kW up to 30 MW and heads up to 300 m
  • Horizontal or vertical axis
  • Single or double discharge runners
  • Spiral intake or open flume

Pelton units up to 30 MW

Guarantees of efficiency and output are based on model tests from the ANDRITZ Hydro laboratories for one to three nozzles in horizontal and three to six nozzles in vertical arrangement.

The flow control of the Pelton turbine, via operation of nozzles and deflectors, provides a high efficiency along the flow range of operation as well as limited overpressure effect over the penstock.

Over the years, the Compact Hydro Division has also developed a strong expertise in special applications for hydraulic turbines, like the energy recovery in Reverse Osmosis desalination process or in the drinking and waste water systems.

  • Mini hydro from 100 to 5,000 kW and heads from 60 to 800 m
  • Small hydro up to 30 MW and heads from 50 to 1,000 m
  • Horizontal, 1 to 3 nozzles
  • Vertical, 1 to 6 nozzles
Stave hydropower plant, Canada

Stave hydropower plant in Canada


  • Synchronous or asynchronous type

  • Horizontal or vertical shaft

  • Air or water cooled

  • Brushless excitation

Electrical equipment

Electrical equipment includes solutions for unit control, protection systems, and cabling and power transmission

To meet the requirements of the market in conjunction with the Compact Hydro turbines, an overall concept has been implemented which comprises both the mechanical and electrical equipment of the powerhouse.
Following the modular concept of the mechanical equipment, we also implement the same approach with the balance of plant:

  • Generators with AVR 
  • Control-protection-measuring system 
  • Digital turbine governor 
  • Supervisory Control and Data Acquisition (SCADA)
  • AC-DC distribution 
  • Auxiliary transformer 
  • LV and MV-switchgear 
  • Transformer 
  • Substation 
  • Transmission line

This means that the Compact Hydro division is in a position to tender both the hydro-mechanical equipment, as well as the total or partial electrical equipment up to a unit output of 30 MW.

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  • Small and Mini Hydropower Solutions PDF : 6.4 MB