Real-time data from the voyage confirms that this dual propulsion approach is not only technically feasible, but also impactful: The vessel’s GHG emissions on the current voyage meet the 2050 Fuel EU Maritime GHG intensity targets and IMO’s GFI Direct Compliance targets at least until 2044.
The power of wind-assisted propulsion has been tested through Bow Olympus’ two first cross-Atlantic voyages. The four 22-meter suction sails have been operational under varying weather conditions, with the performance closely monitored by Odfjell’s crew and technology team on board and onshore.
“The results have surpassed our expectations,” confirms VP Technology Erik Hjortland. “Even in good, but not perfect, wind conditions, we observed a 15-20% energy-saving effect. That translates to five tons of fuel saved per day, equivalent to a reduction of 15 tons of CO₂ emissions per day. On certain parts of the current voyage, we have seen up to 40% fuel consumption reductions. These are very promising figures. We are thrilled to note that our initial calculations are confirmed and even exceeded.”
Using a new type of AI-based weather routing system allowed the five-year-old 49k dwt vessel to take full advantage of the prevailing wind conditions.
“One surprising finding is that even light wind as high as 15 degrees on the bow generates noticeable effect. This means that we can probably operate the sails more often than anticipated, positively affecting the already healthy return of investment figures. The sails also offer stabilizing and roll-damping effects,” Hjortland adds.
“Based on current data, we expect that the sails will continue delivering significant fuel savings on future deep-sea voyages in all basins.”
In addition to the sails, Odfjell decided to double the exploration and added another element to Bow Olympus’ current Atlantic crossing: 100% sustainable biofuel. The goal was to explore a pathway towards near-net-zero operations for a deep-sea vessel. The bunkered biofuel was sourced from certified sustainable waste materials. The certification body is accredited by both IMO and EU.
"As Bow Olympus reaches European shores this weekend, she has demonstrated that the dual propulsion solution is a realistic pathway to carbon neutrality for deep-sea shipping, 25 years ahead of time: The voyage shows a full 85% reduction in GHG intensity compared to conventional fuels, without technical investments or upgrades required to consume the fuel. In addition, the energy efficiency is improved by 15-20% by the use of sails," according to Odfjell.
