COMPRESSORS & COMPRESSED AIR


KEY FACTORS YOU NEED TO CONSIDER


Atlas Copco Rental UK and Ireland weighs in on the diesel vs electrical air


compressor debate, to provide a balanced view that considers the operating environment


An electric air W


hen it comes to compressed air in process environments, there isn’t a one size fits all approach – which is often why there is such debate regarding diesel vs electric systems. So, who are the contenders?


First up, you have the tried and tested work horse of the diesel air compressor. Due to their durability and mobility, diesel compressors are well suited to heavy duty applications and remote environments – as they don’t require a connected power supply. However, their emissions can be a hinderance in meeting environmental targets and if you are purchasing a unit, it can come with a higher upfront cost to alternatives. Therefore, you may wish to consider the electric air compressor. They are a more sustainable choice and come with inherent energy-efficiency features such as a variable speed drive (VSD), so you only produce the amount of air required at any given time – vastly reducing your energy consumption. However, they are reliant on you having a power supply.


However, with diesel compressors also able to utilise smart technology, we have to look beyond energy efficiency and emissions to understand the true winner for your industry environment.


Let’s break down the key considerations when it comes to buying or renting an electric vs diesel air compressor Operating costs: As already established, if you’re working without a reliable power source, then your best option is likely to be a diesel air compressor – but if you’re able to plug into a generator you have options. Yes, diesel engines are known for their hardy and reliable nature – and if a breakdown was to occur you’re likely to have colleagues that are familiar with the engine who can identify/resolve the issue. This all contributes to the compressor's longevity and dependability. However, with fewer moving parts, electric compressors typically require far less and complex maintenance – helping to keep costs low.


10 OCTOBER 2025 | PROCESS & CONTROL


compressor, and a diesel alternative (below)


In addition, electricity is often cheaper than the cost of diesel which experiences greater fluctuations in price. If for example, you’re operating partial or unloaded conditions that fluctuate (like the cost of oil) then you’ll undoubtedly benefit from an electric VSD compressor that is highly adaptable to changing demands. But if you require long runtimes and a high demand for air, in a harsh environment, then a diesel compressor could be a better option. And you can still benefit from efficiencies if you opt for a unit which has features to minimise fuel use during idle periods.


Safety and the environment: Electric units are inherently safer than diesel counterparts as they pose no risk of injury from hot parts, such as an exhaust pipe or muffler. The potential for fires and ground contamination from transporting diesel and operating with this fuel can also be avoided.


However, risks in the physical environment beyond potential leaks and spillages, should be considered. An electric unit needs to be plugged in, which could pose a trip hazard if not correctly managed. And, as electric units have developed over the years to also be able to move around a site, like a diesel engine with wheels, lifting hooks and forklift slots, cable management is a key consideration and attention should be made to correct grounding, cable size and ventilation. With regard to further environmental concerns, electrically powered compressors are technically emission free, though you do need to consider the power source, which will itself likely generate CO2.


Whilst diesel engines do produce additional nitrogen oxides (NOx) and other pollutants, which can be harmful to health and the environment, significant advancements are being made to clean up diesel engines. So, if diesel is your only option and you want to reduce your environmental impact, opt for a


unit that supports efficient operations and offers remote monitoring and leak protection. Another environmental consideration is noise: electric machines can be up to five decibels lower than diesel! This makes them ideal for indoor use and for use in environments where both air quality and quiet running are essential considerations for both operators and the community. In summary, go electric when: you have access to a power supply or generator, you need a solution that has a low noise output and low emissions, and if you’re looking for a compressor that is safer to operate – without hot parts or combustible fuel. An added benefit of the electric option is its long service intervals compared to a diesel air compressor.


Go diesel when: access to power is more limited, you may be in a remote or challenging environment, you require high power outputs and airflows and if you’re looking for a solution that doesn’t require cable management.


If you’re still unsure – talk to an expert such as Atlas Copco Rental, a provider of compressed air for temporary and long-term applications for planned activity or emergency situations.


Atlas Copco Rental atlascopco.com/en-uk/rental


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