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Product code: North Ridge Pump as Turbine

North Ridge Pump as Turbine

Pump Type - Pump as Turbine

Max Flow Rate - 4000M³H

Max Head - 200M

Pump Materials - AISI304, AISI316, AISI316L, Duplex Stainless Steel, Bronze, Carbon Steel, Cast Iron, Stainless Steel, Cast Steel, Ductile Iron, Duplex, NiAl Bronze, Super Duplex

Drive - AC Electric



The North Ridge Pump as Turbine (PAT) system is an innovation in pump technology. It allows the pump to run in reverse as a turbine to harness any wasted energy in the system to generate electricity. When not operating normally as a pump, the new design allows for any excess flow and pressure to pass through the pump in reverse. The reverse flow spins the impeller and therefore transfers power through the pump shaft to a turbine, generating electricity.

Pump as turbine example illustration


Even though the pump has undergone design changes to accommodate reverse operation, it is only 2-3% less efficient than running a standard type of pump. Our PAT systems are designed on a case by case basis depending on the system requirements. They are flexible as we can install them with either multistage pumps, centrifugal pumps or split casing pumps depending on the flow rate and pressure requirements. We can accommodate flow rates up to 4000m³/hr and pressures up to 20 bar.

Pump vs Turbine

Typical power harnessing systems involve large turbines up to 10,000 megawatts in size. They can be up to 95% efficient, however the investments costs are high, and it takes around 4-5 years to recover those costs. In addition to the large investment costs, the designs are extremely complex and expensive to install. Highly skilled labour is required to install and maintain the equipment. However, our pump as turbine system does not involve powers higher than 1000 megawatts. The investments costs are low, and these can be recovered in around 6-12 months. They are 85% efficient and the simple design means they can be installed and maintained by relatively low skilled labour at far lower costs.


Typical PAT applications are; water supply systems, water distribution systems, wastewater systems, reverse osmosis, geothermal power plants, irrigation systems, clean water treatment systems and industrial facilities where pressure regulation is required. Also, any installations currently using pressure reducing valves are wasting excess pressure that could otherwise be harnessed for energy recovery. PAT is the ideal solution for developing countries and remote installations where it is difficult to obtain skilled labour and difficult to source the necessary machinery for traditional complex turbine systems.

PAT can be installed in two modes, either; off-grid or on-grid.

Off Grid

For Off-Grid installations, any generated electricity must be used immediately and locally for powering other systems. The power cannot be stored and therefore any electricity not used is lost, this system is not as efficient as on-grid installations. Off-grid systems are viable for smaller motor powers, typically between 0.1 and 15Kw. An alternator is installed that generates the electricity, the frequency of the generated electricity is either 50 or 60Hz.


Pump as turbine river installation


Pump as turbine vertical multistage installation

On Grid

On-Grid installations are the most efficient as the generated power is transferred into an interconnected system. The generated electricity can then either be sold to the power generation company or stored for later use. An on-grid system is recommended for larger motor powers, typically larger than 15Kw. Instead of an alternator, an asynchronous electric motor is installed for generating the electricity. The frequency of the generated electricity is not required to be regulated as it is sent directly to the grid.


Pump as turbine vertical centrifugal pump installation

Pump as Turbine Installation Schematic

Read more about Pump as Turbine in our guide


Pumps as turbines (PAT) is a known concept of using excess flow and pressure to run a pump in reverse to generate electricity. PAT has twin modes to enable them to pump as well as generate electricity. When a pump is used in turbine mode it is typically only 3-5% less efficient than when operating as a pump.
The main differences are Pumps as Turbines (PAT) are usually for installations <1000 Megawatts, initial investment costs are low, and recoverable within 6-12 Months. Efficiency can reach up to 85%, with installation and maintenance performed by relatively unskilled labour.

Turbines investment costs are usually high, taking around 4-5 years to recoup. Designs are complex relying on highly skilled labour. Efficiency can be up to 95%, however the unit can only generate power and move water.
Models are available with Standard End Suction Pumps which are either horizontal or Vertical, Split casing Designs for high flows, and Multistage for higher pressures.
Pump as Turbine’s are around 2-3% less efficient than standard pumps and designs are available with efficiencies up to 85%.

As various designs are available, the actual efficiency of a PAT for a project will depend on the characteristics of the application. In order to obtain an estimate for this please contact us.


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