A hybrid solution fits the needs of RoRo vessels. The solution of shaft generators, converters, and transformers, including a 5000-kWh energy storage system will enable zero emissions operation while in port. This set-up meets RINA Green Plus class notation and saves fuel.

The flexible hybrid solution allows the vessel to operate the engines at their optimal load by providing peak shaving which removes variable loads and also acts as spinning reserve. This reduces fuel consumption and associated emissions, increases engine maintenance intervals, and reduces noise levels when needed.

A solution based on a maritime battery on board and shore charging at destination makes for an all-electric propulsion. This is a zero emissions solution. The thrusters will also have a faster response, which means that the ferry is easier to manoeuvre and operates more efficiently.

The fuel cell on board a cruise ship can supply 2.5MW of power for hotel load and 1.5MW for propulsion. In addition, it has a 2-MW peak power for manoeuvring. This is especially practical when the ship operates in fjords or on stabilising LNG engines. This set up is silent when the ship operates at low speeds and when it is at berth. Fully electric operation means zero emissions.

The fully integrated Wärtsilä Hybrid Solution makes for emission free operations when the vessel is sailing in or out of port or performing cargo operations. The battery will handle the variable load when sailing, which allows the main engine to work on a stable load. This will meet port regulations where reduced emissions are required.

In this configuration, the Wärtsilä Hybrid Solution can achieve up to 15% fuel savings and reduce the total CO2 emissions by up to 20%.

Hybrid solution for DP vessels offer spinning reserve and allow the engines to operate at optimal load. Total installed engine power can be reduced due to the additional power from the batteries that also offer peak shaving for dynamic loads.

Shuttle tankers benefit from the flexible diesel-electric solution because they have the requirement for dynamic positioning (DP). The power required by DP varies, but the diesel electric solution allows the engine loads to be adjusted according to environmental factors. A diesel-electric solution makes it possible to use the engines for steaming and DP, which means that the total installed power can be reduced. This flexible hybrid solution allows the vessel to operate the engines at their optimal load in DP and steaming because it provides peak shaving. This, in turn, removes variable loads and acts as spinning reserve as well. The set-up saves fuel, reduces associated emissions, increases engine maintenance intervals, and reduces noise levels when needed.

Because tug operations have a variable load need, a hybrid configuration is an ideal solution for tugs. This configuration offers peak shaving and load balancing, which means that the engines can operate at their optimal level. The hybrid system allows the tug can run on battery in low load conditions – in and out of harbour and when waiting. The engines will be there for a boost when it needs more power. A hybrid solution can also allow a smokeless start.

A fishing vessel with variable loads will benefit from a hybrid solution, which allows the main engine to run at optimal load. The total installed power can also be reduced – in other words, the main engine installation can be smaller. The battery and auxiliary engines will supply additional power for a boost to propulsion in harsh weather conditions and to offer peak shaving.

The next-generation hybrid electric LNG design is the result of broad industry collaboration. It introduces an impressive 185kcbm cargo capacity within the standard dimensions and displacement of a 174kcbm vessel design. Its five Wärtsilä 31 Spark Gas and Dual Fuel generating sets offer best efficiency and lowest emissions in this segment.

The Wärtsilä 31 engine platform is flexible – designed to operate on carbon neutral and zero carbon fuels in the future. The electric distribution system including Wärtsilä’s 690VAC Low Loss Hybrid concept minimises electrical losses and delivers exceptional redundancy and operational safety. The hybrid system also includes twin 1MWh, 3C batteries and DC hubs running Wärtsilä’s Energy Management software.

The modular propulsion system ensures optimal efficiency in all operating conditions. It is also a flexible foundation for integrating new decarbonisation technologies – for example

• fuel cells
• new energy saving solutions
• other operational optimisation technologies.

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Incat Tasmania is building the world’s largest zero-emissions, lightweight catamaran ferry for Buquebús. It will be powered by a battery electric propulsion system and waterjets. The waterjets are driven by eight very efficient permanent magnet e-motors in a compact and lightweight design.