Compressor ‘revolution’ promises energy savings of up to 15%
11 February 2025 
The Indian compressor manufacturer, Elgi Equipments, has announced a technology that it says will revolutionise the way compressors operate in plants with dynamic air demand, achieving energy savings of up to 15%. The system, called Stabilisor, is designed to address the challenges of unstable compressor performance, inefficiency, and excessive wear, caused by frequent load/unload cycles.
In industrial applications, the gap between a compressor’s capacity and a plant’s air demand is inherently dynamic. This variability leads to the compressor cutting in and out frequently, destabilising its operation and impairing critical components. Traditional ways of dealing with this – such as increasing the reservoir volume, altering the cut-in/cut-out pressures, or adding VSDs (variable-speed drives) – often fall short, introducing new inefficiencies or higher costs, according to Elgi.
The new system – which Elgi calls “a significant leap forward for industrial air compression” – is based on a principle called “recirculate and recover”. It aligns a compressor’s capacity with air demand using controlled recirculation and recovery techniques. By stabilising airflows, the system reduces load/unload cycles, extends equipment lifespans, and achieves energy savings of up to 15% in typical applications. It also reduces system inefficiencies, and maintains high performance across varying demand patterns.
The system incorporates precision-engineered progressive and on-off valves to recirculate excess capacity. It uses stabilisation zones and low-pressure recovery techniques to balance airflow demands dynamically, reducing energy losses by targeting pressure points with minimal differences, while enhancing reliability.
The new system competes with more expensive VSDs, which vary compressor speeds dynamically, but can introduce instabilities and failure risks, according to Elgi. The new failsafe system ensures that even if there is a malfunction, the compressor will continue to run without disruption.
Despite the new system’s energy-saving potential, the cost to customers is said to be minimal. “Compared to a VSD-equipped compressor, our stabiliser system reduces costs by 30%, while ensuring higher reliability,” says Elgi’s managing director, Dr Jairam Varadaraj.
“With its energy-efficient design and potential to reduce wear-and-tear, the Stabilisor aligns with global sustainability goals,” he adds. “Its implementation in industrial plants represents a shift towards greener, more cost-effective manufacturing processes.”
The stabiliser system works with rotary screw compressors which make up 85-90% of the global market for industrial compressors. With modifications, it can also be adapted for use with positive displacement compressors.
Some early adopters have already reported significant savings. One user with a 45kW compressor reports that stabiliser system helped it to save ₹3.86 lakh ($4,450) within six months. “This level of energy savings means the entire machine pays for itself in just two years,” says Elgi’s director of technology, Venu Madhav.
Elgi has patented the Stabilsor’s design and control methodology worldwide, and plans to make the system standard on its future compressors. It will be offering the system globally in a choice of a “light” version designed to be fitted in the field, or a factory-fitted “heavy” version.
Elgi estimates that if the new technology was implemented across all compressors around the world, it could save up to 19 trillion kWh of electricity annually.
The company, founded 64 years ago, says it is currently the world’s sixth-largest air compressor manufacturer. It is aiming to enter the top three by 2035-36, with revenues of at least $2bn. Its immediate goal is to achieve revenues of $450m in 2025-26, and it expects the new stabiliser system to accelerate its growth substantially.
