installation DOT wind turbine

We create positive displacement

Hydraulic wind turbine systems

DOT concept

By using a seawater pump instead of a generator we aim to reduce the weight of the turbine by up to 50%. This enables significant cost and maintenance reduction for future turbine designs.
The high-pressure water can be converted into power, clean water or hydrogen.

How it works

  • 50% weight reduction
  • Significant cost reduction
  • Reduced maintenance
  • Flexible end-application technology

Sustainable products

We deliver flexible end products for a fixed price

Innovation track record

All our innovations are supported by an extensive track record of studies, prototypes and offshore testing. Our approach is to
“put steel in the water”: relentlessly testing the concepts in its designated environment of operation.

Look through our innovations to find out more.

Hydraulic Drivetrain

The core of the DOT concept is a sea water pump directly driven by the turbine rotor. It is capable of slow rotation speed, high pressure and high-power output.

Read more >

Wind Turbine

Operating a water-pumping wind turbine allows for different control strategies. DOT develops these during the integration of the pump in different turbine platforms.

Read more >

Pelton Turbine

Power conversion from high-pressure seawater is done using hydropower technology a pelton wheel driving a generator. DOT creates an unprecedented 4km hydraulic head.

Read more >

Reverse Osmosis

High pressure seawater can also be used through a reverse osmosis system. The DOT turbine takes out several energy conversion steps to arrive at renewably cleaned water for drinking, irrigation or H2 production.

Read more >

Slip Joint

Speedy installation of the thousands of megawatts offshore wind is crucial to meet the Paris goals. The slip joint removes many cumbersome offshore handling operations, allowing single lift turbine installation.

Read more >


Beyond the slip joint, DOT supports innovations on pile driving technology, monopile design and cable and pipeline installation. The “steel in the water” drive makes DOT a valuable partner in Joint Industry Projects.

Read more >

Positive Displacement

Our team

  • Dedicated team of experts & engineers
  • Proven track record executing complex technology projects and R&D
  • Strong industry network

More about us!


TU Delft on board the world largest crane vessel for exploring future Offshore Wind Turbines

15 October 2021

“Wind energy is on the leading edge of a current environmental revolution. The FOX project’s pioneering offshore installation, gives the chance to gather unique data, important to shape the future of offshore wind farms!” quote by David Fidalgo Domingos. Click here for the article on TUDelft.nl

Read more

Heerema Tests Floating Installation of XXL Turbines Method Offshore

15 October 2021

“Heerema Marine Contractors has completed the first offshore test of a novel method of assembling and installing XXL wind turbines onboard a floating, dynamically positioned (DP) vessel.“ Heerema performed the demonstration project, known as Floating Offshore installation of XXL Wind Turbines (FOX), in collaboration with DOT and the Delft University of Technology (TU Delft) to […]

Read more

Follow-up project: HyPE-ST 1.2

28 June 2021

“Hydraulic Pile Extraction Scale Tests for testing the removal of piles from the soil at the end of their operational life.” Open the GROW article

Read more
Copyright 2022 Delft Offshore Turbine. All rights reserved.