The deployment of offshore wind farms plays a crucial role in achieving global renewable energy goals. However, this effort faces considerable challenges as ideal wind sites are often located in remote locations, creating difficult conditions for installation.
As turbines get larger and offshore wind farms get more remote, there is increased demand for more efficient and safer lifting equipment that can enable fast advances in turbine design, work safely in harsh environments and meet strict project targets.
According to researchers at Baku’s Azerbaijan Technical University, installing offshore wind turbines resents diverse challenges from unpredictable weather conditions to complex logistics and safety concerns.
Therefore, advanced weather forecasting, streamlined logistics management, novel foundation designs and stringent safety protocols are pivotal for successful offshore wind projects.
“One of the primary challenges in offshore wind turbine installation is the unpredictability of weather conditions at sea,” they said. “High winds, rough seas and storms can pose significant risks to both personnel and equipment, leading to delays and disruptions in the installation process. “Moreover, adverse weather conditions can impact vessel stability and crane operations, further complicating the installation process.”
The logistics add to the challenge, including the complex transportation of turbine components, such as blades, nacelles and towers to remote offshore sites.
Co-ordinating vessel schedules, ensuring timely delivery of components and managing offshore logistics, also require meticulous planning.
Adding to these complications is the limited access to ports and harbours near offshore wind farms. There are also severe safety risks that operators need to navigate.
“The offshore environment introduces inherent safety risks for personnel involved in turbine installation,”Ahmedov and Layla said.
“Working at heights, navigating vessel traffic and operating heavy lift cranes in challenging conditions require stringent safety protocols to mitigate risks and ensure the wellbeing of workers.”
Moreover, the remote nature of offshore wind farms can impede emergency response efforts in the event of accidents or incidents.
There are also technical restrictions which make the installation process demanding. “While advancements in turbine design and installation techniques have improved over the years, technological limitations still present challenges in offshore wind turbine installation,” the researchers noted.
“For example, the size and weight of turbine components continue to increase, requiring innovative solutions for transportation and installation.
“Additionally, the complex underwater terrain at offshore sites may necessitate specialised foundation designs to ensure turbine stability and longevity.
“Addressing these challenges requires a holistic approach that integrates advanced technologies, robust safety protocols and efficient logistical strategies.”
Different types of installation vessels are used during an offshore wind development, selected based on market availability, budget, and the size and number of components to be installed.
Heavy lift cranes are the workhorses of offshore wind turbine installation, capable of lifting and positioning large turbine components with precision and efficiency using crawler cranes, floating cranes and vessel-mounted cranes.
Jack-up vessels, meanwhile, are equipped with self-elevating legs, providing a stable platform for crane operations and turbine installation in offshore environments.
Installation barges are flat-bottomed vessels designed to transport and install offshore wind turbine components, featuring large deck areas and heavy lift cranes mounted on the deck.
Floating cranes operate in offshore environments, equipped with dynamic positioning systems to maintain position and stability in open water.
Due to Australia’s unique environment, according to the Maritime Union of Australia (MUA), if Australia’s offshore wind developments are realised, the industry would require vessel-mounted cranes with a capacity over 3,000 tonnes which would operate in harsh conditions.
However, as of 2023, the nation’s current crane licensing system does not cover cranes of this capacity. The MUA said workers handled components for onshore renewable energy in ports including large and delicate components for wind turbines, such as blades, towers and nacelles, but without a high risk work licence and with inadequate and poorly implemented VET qualifications for this work.
“Developing new high risk work licences for ships’ cranes, mobile harbour cranes and dual lifting and ensuring that this material is integrated into existing qualifications or becomes a recognised skill set is important to secure the skills currently needed to build onshore wind projects.”
The MUA said a new high risk work licence should also be developed for offshore cranes. “The installation of offshore renewable energy will involve cranes with a capacity over 3,500 tonnes, and a 45m reach, installed on vessels that will load offshore wind turbine components in an Australian port, and then take them out to the project site 10 to 40 kilometres off the coast of Australia to assemble the components at sea.
“The operation of these very large cranes is a critical safety issue for the offshore renewable energy industry. “There is growing potential for a skills shortage of offshore crane operators, and a need to develop an
Australian package of competencies for incorporation in an existing seafarer qualification or as an associated skill set specifically suited to the changing nature of local work and industry.
“Ultimately, we need a proper planning process to identify the scale of offshore renewable energy development in Australia in order to fully understand the size of the workforce we will need,” the MUA said.
