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Servogear AS9 Feb 20232 min read

The most valuable energy is the one you do not use

The most valuable energy is the one you do not use

In today’s marked there is a collective strive towards zero emissions. It is therefore not surprising that many are exploring how to build vessels, or optimize existing vessels, so they run on green energy sources. 

However, investing in systems that use green energy such as batteries, is not the only option when creating a more sustainable vessel. What often gets overlooked is the importance of optimizing the energy-consumption. 

In this article, we will dive deeper into this topic and look at ways you can achieve a greener operation, regardless of the energy source used. 

Download: How to run a performance review on your vessel


Energy Efficiency is Key

Imagine you live in a house that is costly to heat. I think we would all agree that it is wise to improve your insulation and seal air leaks, before investing in a new heater. Having the same approach when aiming to make your vessel more sustainable is key.  

Choosing a renewable energy source is a great step towards accomplishing a greener vessel.  However, if your energy consumption is not optimal, you are spending more energy than needed. Think about what you could use this energy for instead?

The cheapest and fastest way to reduce your carbon footprint, is to improve energy efficiency.

Energy efficiency is all about using less energy to perform the same task. In other words, it is about eliminating energy waste. Through doing so, you are able to reduce both emissions and costs.

There are huge opportunities for efficiency improvements on most vessels, regardless of energy source. As such, if more vessels chose to focus on optimizing this area, there would be a substantial reduction in the overall demand of energy imports.  


Read more: Why Twist Your Rudder


What to Consider

In this section, we will share ways you can optimize your energy-consumption. However, it is important to state that lowering the use of energy, should never come at the expense of safety and purpose of the vessel.

3 areas to consider for better energy-efficiency:

  • Weight: The weight of the vessel is probably the most important aspect to consider. Any excessive weight will increase the draught of the vessel, hence increasing the resistance in the water which leads to a higher energy consumption.

  • Optimizing the hull: Minimizing hull resistance in the sea is key to reducing energy consumption.

  • Optimizing the propulsion line: When optimizing your vessel, it is crucial to look at the complete propulsion line; the engine, shaft, brackets, gear, rudder, propeller etc., which will vary depending on vessel type. For example, if you have a highly efficient propulsor, you can invest in a smaller engine.


Read more: Efficient Propulsion in a Green Environment, What are the Options?



Energy is a scarce resource, thus it’s important to ensure we make smart choices to reduce consumption. We therefore recommend that you optimize your vessel’s energy-efficiency before you resort to another energy source. Using energy more efficiently is the most immediate and cost-effective way to reduce greenhouse gas emissions and tackle the growing energy demand.



Servogear AS

Servogear is a leading manufacturer of Controllable Pitch Propeller Systems for high-speed workboats, fast ferries, offshore vessels and yachts. Our tailor made solutions provides our customers with a unique combination of speed and thrust.