Update of InfinityWEC G7 PTO Improvements

Update on InfinityWEC G7 Power Take-Off Improvements

Göteborg/Karlskrona, Sweden, 30 December 2025

Eight years of simulation driven wave power technology development and optimization has resulted in the highly efficient InfinityWEC G7 Power Take-Off (PTO). Ball screw actuators in combination with hydrostatic pre-tension provides an instantly controllable force and phase control technology (MPC) to optimize the power capture and electricity production from ocean waves.

During 2025, several improvements to the InfinityWEC PTO design have been made, within the EU-financed INFINITY Project:

1. New hull design with conventional cylinder seal and linear guiding, protecting the ball screws from side forces and bending moments.

1. Survival functionality with a new hydraulic cylinder with slack-catch, to eliminate snap loads in the tether and to maintain motion control of the buoy in large waves.

1. Axial flux motors and silicon carbide inverters from EV reduce weight, cost and improve overall efficiency.

1. High-speed flywheel energy storage system to provide reactive power for MPC control and up to 500 kW continuous power output.

Mikael Sidenmark, CEO, says: “Simulations of energy production and cost estimations for InfinityWEC generation 7 show very competitive metrics. The reason is the exceptional performance in combination with use of low-cost materials and simple methods for manufacturing and installation.”

Mikael Sidenmark continues, “The weight of the PTO has been reduced from 40 to 30 ton. Annual energy production is furthermore estimated to increase from 2.0 to 2.5 GWh per 500 kW WEC at high energy sites with a new high fidelity MPC algorithm being developed in the project. The structural efficiency is improved from 13 to 18 MWh AEP / ton. “

The PTO technology and a moment-based MPC algorithm are developed and validated in a 1:4 scale prototype on a real-time control system in a test-rig, in the 2.7 MEUR EU-funded project INFINITY (2025-2027).