Solutions for greenhouse gas emissions reduction

Wärtsilä has developed various solutions to assist in reducing greenhouse gases (GHG). As a result of our long-term development work, we have managed to develop a range of engines that feature both high efficiency and low emissions. Wärtsilä’s technologies and solutions provide various alternatives to reduce the climate change impact.

Engine efficiency improvement

High efficiency is important in the control of climate change, and with low emissions our products meet the various environmental regulations. The efficiency of Wärtsilä diesel and gas engines ranges between 42-52%, depending on the engine type.

Gas and multifuel engines

The Wärtsilä dual-fuel (DF) engine is another innovation that has a significant effect on controlling climate change. Thanks to the technology developed by Wärtsilä, our customers can flexibly employ the same engine using various fuels. This also makes it possible to reduce the impact on the environment.

DF engines are used in power plants and for powering LNG carriers and also for other types of vessels. This single solution means that the total CO2 emissions from all our current customers' LNG-carrier applications will be reduced by several millions of tons, when compared to traditional gas transportation. At the same time, the availability of gas will be improved and the environmental impacts of gas transportation will be reduced. CO2 emissions can be reduced even more effectively with renewable energy sources, such as liquid biofuels.

Modernisations and conversion services

Wärtsilä applies new technologies also to its existing products, which makes it possible to further reduce their environmental impact. With the help of our service products, we can improve the efficiency of older engines and reduce their emissions to the same level as those of our newer products. We also convert oil-fuelled engines for gas or biofuel use.

Fuel cell development

A fuel cell is a clean, efficient and reliable method of producing energy, making it a highly attractive option for distributed power generation. Read more on the latest developments of Wärtsilä's fuel cell programme in the section Creating new solutions.

Waste heat recovery for ships

In addition to general use of waste heat, steam-based combined cycles have been applied in ship applications for a long time. For applications in which waste heat is limited in amount and temperature, we are designing and commercialising an ORC system to fulfil marine environment requirements.

Wärtsilä has also introduced a Boosting Energy Efficiency Catalogue, which contains more than 50 different efficiency improvement actions for saving energy in ships. Please visit for a more complete view of the solutions introduced in this catalogue.

Environmentally advanced vessel solutions

The new Wärtsilä Gas Platform Supply Vessel (PSV) design represents a state-of-the-art vessel featuring outstanding energy efficiency, a unique hull form, fuel flexibility and outstanding vessel performance in areas such as fuel economy and cargo capacity. This is a unique configuration of the gas electric propulsion system based on a combination of the Low Loss Concept for Electric Propulsion and the recently introduced Wärtsilä 20DF engine. Wärtsilä’s ability to offer total concept solutions that include the design of the vessel, the propulsion plant, electric & automation and a host of fuel saving and environmentally sustainable options has given the company a notable competitive edge - particularly in the area of speciality vessels such as Gas PSVs.

Combined cycle

Many steam combined cycle diesel engine plants have been delivered during the recent years. Today, the focus is strongly on introducing high-efficiency gas engine combined cycle solutions, specifically intended for plant sizes of several hundred megawatts.

Combined heat and power

Combined heat and power plants (CHP) cover various types of recovery and utilisation of heat energy, in addition to electricity generation. The energy can be utilised as heat, such as hot water or steam, or as cooling by means of chillers. The most recent step is an exhaust gas driven chiller, which is believed to offer a cost-competitive CHP solution for various market areas.

SolutionPower (MW)FuelAnnual CO2 reductions (t)Reference technology and fuel
Single cycle engine power plant 50 HFO 58 871 Boiler plant/Coal
Single cycle engine power plant 50 HFO 43 687 Gas turbine /LFO
Single cycle engine power plant 50 Gas 26 342 Single cycle gas turbine/Gas
CHP engine plant (total eff. 90%) 30 + 30 (Heat) Gas 83 552 Boiler plant/Coal (EI.) + Boiler plant/LFO (Heat)
DF engines in LNG carriers 40 Gas 41 000 Steam boiler
LNG cruise ship 68 Gas 43 000 Cruise ship/HFO
Gas engine conversion 50 Gas 57 200 Diesel engine/HFO


As the industry frontrunner, Wärtsilä has a responsibility to develop and supply advanced solutions that enable the environmental impact of its customers to be reduced. This is Wärtsilä’s main role in the combat against climate change.
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