Electric ferry gets off to a great start with DEIF solution

In 2021, Danish ferry operator Molslinjen added an electric ferry to its Esbjerg-Fanø route to boost service reliability and minimise environmental impact. A DEIF solution including a Delomatic 4 power and energy management system plus competent project support has helped make the switch from diesel to electric propulsion very successful. One captain considers the system very easy to use, and the project superintendent ranks the experience as the best new ship project he has been involved in.

Off the west coast of Jutland, Denmark, lies the scenic island of Fanø at the northern end of the shallow Wadden Sea. Even though Fanø is only a couple of kilometres from the busy port city of Esbjerg on the mainland, there has never been a bridge to the island; instead, its 3,500 inhabitants and thousands of annual visitors depend on a ferry service. Since 2018, the Esbjerg-Fanø crossing has been operated by Danish ferry company Molslinjen which provides reliable ferry services for daily commuters and tourists alike. The need for reliability and safety is underscored by the fact that the ferry is an integral part of the island’s emergency response system, always ready to take patients to hospital on the mainland.

“Every once in a while, accidents happen, and we’re constantly on standby for ambulances,” says captain Iben Gejl Christensen who has sailed the route since 2003. “When the ambulance arrives, we depart immediately.”

Easy to put into service

The Grotte has been in service since 1 October 2021 and both crews and management are happy with the new ship – and its control systems. Even though sailing on electrical power is different from sailing on diesel power, Iben Gejl Christensen has not had difficulties adjusting to the new system.

“I think it’s simple to work with,” she says. “It’s very manageable. We just need to press two buttons to start charging and two buttons to prepare for departure. I was able to learn, so I guess most other people could, too,” she adds with a smile.

Superintendent Thomas Jensen from Molslinjen is responsible for daily operations on the crossing and has been involved in the Grotte project since its early stages. He agrees that putting the new ferry into service has been relatively easy. “The commissioning went without any incidents,” he says. “Of course, we had to test the charging procedure at night to avoid disturbing operations. We spent three or four nights getting things ready, and I think it went well.”

State-of-the-art power and energy management

The Delomatic 4 system on the Grotte is a state-of-the-art power and energy management system that can be customised and engineered to fit a wide range of specifications and requirements. It is a perfect match for marine hybrid applications such as battery solutions and DC bus solutions, and the system can be monitored and controlled from multiple operator touch screens.

These features make the system a perfect match for the Grotte with its energy storage systems and DC bus. The control system on the ferry includes features for both daily operations and maintenance and can easily be accessed from 15” touch screens mounted on the bridge and in the two engine rooms. DEIF and Molslinjen staff can also access the system remotely to carry out monitoring or troubleshooting over a secure internet connection. The system provides facility management for the battery management system and displays important battery alarms on the operator touch screens, and it allows the crew to easily switch and manage batteries and inverters.

Quiet and easy daily operations

On the daily crossings, the captain and first mate take turns at the controls for a round trip, alternately overseeing loading and unloading and deck operations. The crew also includes an able ship’s assistant and an ordinary ship’s assistant.

“We don’t really notice the battery operation, except that we can’t hear the engines or see any smoke from the exhaust”, says Iben Gejl Christensen. “Of course, we need to keep an eye on the state of charge, but apart from that it hasn’t been a big challenge to adjust to battery operations. It’s quiet on board – really quiet, in fact, and our passengers notice that, too”.

When the Grotte is in port in Esbjerg, the crew can easily start and stop the charging procedure by pressing buttons on the touch screen. A hatch on the side of the ship is opened, and the charging system plug is lowered towards the hatch and automatically grabbed and plugged into the ferry socket. After charging, the plug is ejected and hoisted away from the ship, the hatch closes, and the propulsion system is ready for departure. If the state of charge drops below 56% at sea, the diesel engine is started automatically to recharge the battery in order to comply with international maritime safety regulations.

Contributing to greener shipping

When the Grotte was put into service, Danish Minister for Transport Benny Engelbrecht was one of several guests who attended the official launch event, indicating the significance of battery-powered vessels as a means to contribute to lower carbon emissions from shipping. Similarly, the ferry is a perfect match for Molslinjen’s corporate social responsibility policy which calls for responsible conduct while contributing to freedom of movement: Molslinjen is continuously working to identify, prevent, or mitigate adverse impacts on sustainable development, and the Grotte proves that this can be achieved without adversely affecting the ferry timetable, or jeopardising safety on board.

“Our primary target was to get a green solution,” says Thomas Jensen. “We want to be seen as an innovative and sustainably managed transportation company. Molslinjen wants to develop battery operations on its shorter routes in western Denmark. We believe that getting this crossing to work was a good start, and everything indicates that we will succeed so we’re ready to upgrade our other routes with something similar to this. Bigger, of course, but similar!”

Off to a great start

Since 1 October 2021, the Grotte has been in operation with no significant cancellations or delays, marking a great start for the electric ferry which is now handling the passenger load alongside the Fenja and Menja and ensuring reliable, green, and safe transportation through the UNESCO world heritage waters between Esbjerg and Fanø. Despite the new propulsion solutions below deck, however, not much has changed on the bridge.

“The new world of electric operation has not changed the crossing itself,” says Iben Gejl Christensen. “We’re doing the same thing that we always have: We sail back and forth and make sure our customers get to and from the island. We just need to focus on some other things. I think it’s really easy to use the DEIF system because we can’t really make mistakes. It has to be that way – it has to be simple and easy. We shouldn’t have to press all kinds of menus to charge or stop charging or check how much power we’ve got on the batteries. It works well!”

Good performance with competent support

Throughout the project, DEIF has supported the Delomatic 4 system with know-how and practical technical solutions based on the company’s extensive experience from all types of marine power applications, including electric and hybrid propulsion solutions. These competences have contributed to a smooth project process where issues and challenges have been resolved quickly through a good and open dialogue between Molslinjen and DEIF. Speaking from a manager’s perspective, Thomas Jensen is very satisfied with the overall DEIF solution.