15 December 2021
When considering renewable energy sources to assist with decarbonisation of industries and energy generation, the vast potential for wave energy production is undeniable.
While the generation of energy from wave movement is not a new concept, there is still research required into what evices are optimal for different conditions. We are deeply involved in the development and testing of one option, the Moored Multimodal Multibody (M4) prototype.
The M4 wave energy technology was originally developed at the University of Manchester, UK. A prototype is now being developed to be deployed in King George Sound, Albany, Western Australia, with the intention of proving the technology as a basis for future full-scale deployments.
The M4 is an attenuator type of Wave Energy Converter (WEC). The floating device harvests incoming wave-energy from all directions, with differential movement driving the pinging joint to create power. The 6-float M4 prototype device will be 22m long and generate power onboard, without a subsea cable in the initial phase.
The WEC is one of many converter types which are being designed and tested around the globe.
Unlike the more mature wind energy sector where most devices use the 3-blade turbine, wave energy technology still hasn’t converged on one type of device, and research and testing of new options is still required. The M4 prototype offers a real opportunity to stand out.
The M4 deployment will be the first wave energy machine of its kind to access Australia’s abundant wave energy potential, helping to bring skilled experts to regional Australia and build an industry around the ocean renewable energy market. The southern coastline of Australia has significant wave power potential because of the sheer size of the coastline and the wave swells which are generated in the Southern Ocean.
This is a collaborative project between industry, including BMT, the University of Western Australia (UWA), the Blue Economy Cooperative Research Centre (BE CRC) and the Western Australia Government, and will address the feasibility of deployment of a wave energy machine and engage with the local markets, including nearby aquaculture operations.
Working within the complex marine environment provides a unique set of challenges, which the M4 project will seek to overcome, all while contributing vital knowledge to the renewables sector. In addition, the M4 deployment will demonstrate Australia’s potential to establish itself as a world class energy resource centre, capable of supporting commercial wave energy projects in the future.
The vision is for a future project to build on this prototype to progress it to a commercial scale. The Australian Ocean Energy Group (AOEG), which we are a part of, have engaged a full-time project manager with the support of the National Energy Resources Australia (NERA) to develop an ‘Ocean Energy Showcase’ at Albany, which would likely include a wave energy device.
A few years ago, we participated in the important ‘Ocean Energy Market Summit’, which sought to explore the feasible market opportunities for ocean energy. The summit identified markets such as aquaculture, offshore operations (e.g., oil and gas), remote island or coastal communities and marine instrumentation.
Hybrid Renewable Energy Systems (HRES) are an obvious solution to bringing more environmentally friendly, cost-effective energy delivery options to regions and communities who are not part of a larger power grid. By maximising the efficiency of available energy sources, HRES overcome unreliable and intermittent power delivery, particularly in remote areas.
We are currently exploring the potential application of our BMT Smart Microgrid Controller for the Albany area as part of the Ocean Energy Showcase. With its robust design for harsh environments, BMT’s Smart Microgrid Controller provides an autonomous ‘microgrid’ manager that automatically synchronizes power from a variety of sources, to seamlessly handle load management.
The BMT Smart Microgrid Controller’s scalability and remote monitoring capability used in synchronisation with other renewable technologies like, wind, wave or solar make it a great option.
While it is recognised that wave energy delivers a clean and reliable source of power, the potential impacts of wave energy machines on the local environment must be carefully examined. A rigorous environmental approvals process is key to mitigating critical impacts on marine flora and fauna. This also includes correct site selection to ensure the device causes no
disruption to migration patterns or poses navigational issues for commercial or recreational boat users.
Typical environmental considerations include hazardous liquids, noise from mooring chains, electromagnetic field effects and risk of entanglement. Cameras can also be used to monitor how species interact with the structures and to date, there have been no adverse effects recorded globally. Effective environmental plans must also capture the maintenance and decommissioning of structures.
In summary, while wave energy won’t be overtaking other energy options, it remains a viable option to supplement the overall renewable energy market and can be particularly valuable in remote communities that are run on diesel or have difficulty accessing the grid for power.
Associate Principal Engineer, Critical Infrastructure
Associate Principal Engineer, Critical Infrastructure
Chris is a Registered Professional Mechanical Engineer, including
RPEQ, NER, and CPEng. He joined BMT in 2011 and is a Senior
Mechanical Engineer, providing engineering consulting and design
services to various sectors including mining, ports, bulk materials
handling, manufacturing, insurance, renewable energy, and defence.