Riding the Waves Vitalnrg’s Elongate Vertical Wave Energy Converter

Vitalnrg, Inc. has filed a patent for a wave energy conversion device that is vertically oriented in a body of water, using an oscillating core driven by a float and a weighted counterpart to convert the rise and fall of ocean waves into rotational motion that drives electrical generators. The invention addresses key engineering challenges in marine renewable energy through a self-contained, mechanically elegant design.

The Problem

Ocean wave energy represents an enormous untapped renewable resource. The world’s coastlines are continuously subject to wave activity that contains vast amounts of kinetic and potential energy, yet wave energy conversion technology has proven remarkably difficult to develop into commercially viable, large-scale electricity generation systems. Decades of engineering effort have produced numerous concepts and prototypes, but few have successfully made the transition to commercial deployment.

The core challenge with wave energy is the nature of the energy input itself. Ocean waves are irregular, omnidirectional and vary enormously in height and period. A device that works well in moderate swells may be overstressed in storm conditions or ineffective in calm weather. The mechanical conversion system must accommodate this variability while maintaining efficiency across a range of conditions. Many early wave energy converter designs used hydraulic systems or linear generators to capture wave motion – approaches that are technically complex, require substantial maintenance in the harsh marine environment, and often suffer from efficiency losses in the conversion chain.

For a wave energy converter to be commercially deployable, it needs to be robust, relatively simple mechanically, scalable to appropriate power output levels, and capable of reliable operation over extended periods with minimal maintenance. It must also be able to be anchored or moored appropriately and to survive the mechanical stresses of both operational and storm conditions.

What This Invention Does

Vitalnrg’s device is vertically oriented in the water, with an oscillating core at the centre of the structure. The core is connected above to a float that rides on the water surface and below to a weighted element. When a wave crest passes, the float is lifted, pulling the oscillating core upward. When the wave trough passes, the float falls and the weight pulls the core downward. This combination of a buoyant upper element and a gravitational lower element ensures the core oscillates in both directions – generating useful mechanical motion during both the rise and fall of each wave, rather than only during one phase.

The oscillating core’s vertical movement is converted into rotational motion through a set of ballscrews and threaded shafts. As the core moves up or down, the ballscrews rotate, and this rotation is connected to generators that produce electrical power. Ballscrew mechanisms are highly efficient at converting linear motion to rotational motion, and their use in this application avoids the energy losses and maintenance challenges associated with hydraulic conversion systems.

The core is substantially enclosed by a movement-resistant shell with a horizontally-extending heave plate. The heave plate increases the hydrodynamic resistance of the surrounding structure – the shell resists vertical movement while the core oscillates – creating the differential motion between the core and the shell that drives the conversion mechanism. This reaction-body approach is common in wave energy converter design, but the ballscrew conversion mechanism and the combined float-weight drive system represent Vitalnrg’s specific engineering solution.

Key Features

Vertical orientation. The elongate device is vertically oriented in the water, enabling deployment in open ocean or coastal areas where horizontal devices would be impractical, and providing natural alignment with the vertical motion of ocean waves.

Combined float and weight drive. A surface float drives the oscillating core upward during wave crests, while a weighted element drives it downward during wave troughs, ensuring power generation during both phases of wave motion.

Ballscrew linear-to-rotational conversion. Ballscrews and threaded shafts convert the oscillating core’s linear motion to rotation with high mechanical efficiency, driving connected electrical generators without the complexity of hydraulic systems.

Movement-resistant shell with heave plate. The outer shell with a horizontal heave plate provides the reaction mass against which the core oscillates, creating the differential motion that powers the conversion mechanism.

Multi-directional wave response. The vertical oscillation response to wave-induced water surface motion means the device can respond to waves from any direction without requiring heading control or active orientation.

Who Is Behind It?

Vitalnrg, Inc. is a US-based wave energy company focused on developing deployable marine energy conversion technology. The inventors – Kevin Barrett, Eldin Miller-Stead and Arthur Q. McNabb – bring expertise in marine engineering, renewable energy systems and mechanical design. The application is filed through Spruson and Ferguson and is a divisional of an earlier filing (AU 2020275015), reflecting a multi-year development programme in wave energy technology.

Why It Matters

The imperative to decarbonise electricity generation has never been more urgent, and while solar and wind energy have achieved commercial scale, marine energy resources – waves, tides and currents – remain largely untapped. Wave energy has the advantage of being highly predictable and geographically complementary to solar and wind, generating power when the sun is not shining and the wind is not blowing. A commercially viable wave energy converter could make a meaningful contribution to the renewable energy mix in coastal nations including Australia, which has some of the world’s most energetic wave resources along its southern and western coastlines.

Vitalnrg’s ballscrew-based vertical wave energy device represents a mechanically straightforward approach to a problem that has defeated many more complex designs. By avoiding hydraulics in favour of direct mechanical conversion, and by using both float and weight to drive the oscillating core in both directions, the design addresses two of the most persistent challenges in wave energy development: conversion efficiency and operational complexity. Whether this technology can scale to commercial power generation capacity remains to be demonstrated, but the engineering principles are sound and the patent reflects a genuine and thoughtful attempt to solve one of renewable energy’s hardest problems.

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AU 2026201617 was published in the Australian Official Journal of Patents on 19 March 2026 and is open for public inspection. Patent applications represent inventions that are sought to be protected and do not necessarily reflect commercially available products.