Retrofits Could Accelerate U.S. Offshore Wind Development

Ulstein group is a front runner. The Norwegian-based company has already provided the design for a rock installation vessel now under construction for a joint venture between Houston-based Great Lakes Dredge & Dock (GLDD) and Netherlands based Van Oord. Now being built at Philly Shipyard and due for delivery in first half of 2024, the ship will be the first Jones Act-compliant offshore wind support vessel to be built in the US. It will be deployed on the Empire I and II wind farms off the coast of New York.

Lars Ståle Skoge is Commercial Director at Ulstein Design & Solutions AS. “There is a great potential for European companies like Ulstein to contribute to develop the offshore wind market in the US, and get a quick start based on the learnings from the European offshore wind industry,” he told Offshore Engineer.

His Rotterdam-based colleague, Nick Wessels, outlines the company’s strategy of diversification. Ulstein is offering a wide range of offshore wind designs for different tasks, he reveals, but it is also offering scope to upgrade existing vessels.

“We have several designs available that are suitable for US operations,” he explains. “These include feeder jack-up installation vessels, feeder transport units to ship foundations and turbine components to jack-up vessels, and heavy-lift foundation installation ships.” The designs can all be customized to meet specific clients’ requirements.

Head start

It is no secret that Ulstein is in discussion with various offshore wind companies in the US but company executives cannot reveal more details. Wessels says that the selection of an Ulstein design by GLDD provides a head start. The US company required a Jones Act compliant, dynamically positioned vessel that could be constructed in a US shipyard to undertake scour protection on offshore wind foundations.

There are specific requirements for vessels to be deployed in the US. Apart from the Jones Act itself, ships designed for US deployments must also meet US Coast Guard requirements. And, depending on customer and shipyard, designing in imperial units may be a significant plus point, Wessels reveals.

“Typically, we see that build time in the US is longer than in Europe, for example, and we constantly evaluate the possibilities and the best project approach,” he explains. “Our Dutch design office typically works on one-off designs that are fully tailored to client specific requirements. We prefer to work with the shipowner for the concept and basic design as they know what they want to do with the vessel in terms of operation.

“It allows the shipowner to tender with several shipyards,” he continues. “After that, we are happy to support either the selected shipyard in the actual building of the vessel if so desired or to keep supporting the shipowner’s newbuilding team.”

The opportunity to upgrade or convert existing offshore vessels could provide a fast track. Ulstein has completed a number of conversion projects including the two PX121 platform supply vessels, Esvagt Leah and Esvagt Heidi. Both ships, originally built at Ulstein Verft, returned there in 2021 to be upgraded with more environmentally friendly power systems and converted into emergency response and rescue vessels.

Another more extensive upgrade is currently in progress in Ulsteinvik. The shipyard is currently engaged in the upgrading of the Service Operation Vessel (SOV), Windea Leibniz, built in 2017, which features a TWIN X-STERN. This unique Ulstein hull form provides the vessel, managed by Bernhard Schulte Offshore, with significantly better seakeeping qualities, widening the weather window.

The SOV has already worked successfully for Siemens Gamesa on the Sandbank and DanTysk wind farms in the German North Sea. But her operational window will now be significantly increased by a series of modifications. These include the recently completed installation of an adjustable pedestal for the gangway and a 50% increase in single cabins for charterers, providing accommodation for 60 persons. This will mean a change in the vessel’s status from SOV to Construction SOV (CSOV).

In another upgrade, early in 2022, Norway’s Norside Wind AS opted to convert the platform supply vessel, Farland, into a walk-to-work vessel for the offshore wind sector. The vessel, of Ulstein PX121 design, has been equipped with a motion-compensated gangway, an Access & Cargo Tower, a new accommodation module, and a battery package. The converted vessel will now operate under the name Norside Cetus.