
OptiSave™ - Energy Saving System
DESMI OptiSave™ is a sophisticated energy-saving system designed to optimize the operation of pumps and fans by adjusting their speed to match current conditions.
OptiSave™ transforms energy efficiency by adjusting pump and fan operations to meet real-time demands. This system reduces unnecessary energy consumption, significantly lowering fuel use and operational costs. By minimizing strain on equipment, OptiSave™ extends system lifespan and ensures consistent performance, enhanced reliability, and reduced maintenance needs in marine operations.
Why Save Energy at Sea?
Fuel is the biggest voyage-related cost, accounting for a significant portion of operational expenses. Even minor improvements in energy efficiency can have a major financial impact, reducing fuel consumption and lowering overall operating costs. At the same time, stricter environmental regulations and sustainability goals make energy efficiency more important than ever.
OptiSave™ is designed to help shipowners, operators, and charterers cut energy waste by automatically adjusting pump and fan operations in real-time. By preventing unnecessary energy use, the system ensures that vessels consume only the fuel they actually need, leading to:
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Fuel savings = Lower OPEX – Every ton of fuel saved reduces operating expenses. |
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Compliance with IMO regulations – Supports EEDI & SEEMP energy efficiency targets. |
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Lower CO₂ emissions – Contributes to global sustainability and IMO’s net-zero 2050 goal |
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Prolonged equipment lifespan – Reduced wear and tear on pumps and fans means lower maintenance costs |
OptiSave™ directly addresses these challenges by regulating cooling systems and ventilation to match actual demand, preventing unnecessary energy consumption

How Much Energy Are Ships Wasting?
Most ships are designed for maximum cooling demand based on worst-case conditions, such as operating in 32°C seawater at 100% engine load. However, in reality, most voyages take place in cooler waters, where such high cooling capacity is rarely needed. Despite this, cooling systems continue operating at full power, consuming more fuel than necessary and increasing both operational costs and CO₂ emissions.
Since ships are built to handle extreme conditions, their cooling systems are often oversized to ensure they can perform under any circumstances. But without intelligent regulation, these systems run at full capacity even when it’s not required, leading to fuel inefficiency, higher maintenance needs, and increased engine wear. Over time, this unnecessary energy use adds up to significant financial and environmental costs, making optimization an essential factor for sustainable and cost-effective operations.
OptiSave™ automatically adjusts cooling pump and fan performance based on actual demand, optimizing energy use without compromising cooling efficiency. By regulating system output, it prevents unnecessary fuel waste and extends equipment lifespan, ensuring a more efficient and cost-effective operation.
Smarter energy management means lower fuel costs, fewer emissions, and improved operational efficiency.
Savings From The Field

Many shipowners and operators assume that energy-saving systems like OptiSave™ only work with specific pump brands. That’s not the case.
OptiSave™ is designed to be fully compatible with all pump brands, ensuring fuel savings and efficiency improvements for any vessel, regardless of the existing equipment.
This flexibility allows shipowners to implement OptiSave™ without replacing their current pumps, making it a cost-effective solution for energy optimization. Whether your ship is running with DESMI pumps or another brand, OptiSave™ seamlessly integrates into your existing cooling and ventilation systems, reducing energy consumption without requiring major retrofits.

A win-win for:
Shipowners
Shipowners know that fuel efficiency is a top priority for charterers. A vessel equipped with OptiSave™ is not only more cost-effective to operate but also more desirable in a competitive market. Charterers actively seek fuel-efficient ships to keep operational costs low, meaning that an OptiSave™-equipped vessel is more likely to be preferred and chartered faster.
By reducing fuel consumption and improving energy efficiency, shipowners can:
- Increase the marketability of their fleet for long-term or repeat charters.
- Attract charterers looking for cost-saving opportunities.
- Enhance operational efficiency, making the vessel more valuable over time.
A ship that burns less fuel becomes a more attractive asset, ensuring better opportunities for securing contracts in a competitive market.
Charterers
Fuel is one of the largest operating costs in chartering agreements, and any savings directly impact profitability. OptiSave™ helps charterers reduce unnecessary fuel consumption by adjusting pump and fan operations in real time, ensuring that energy is used only when needed.
For charterers, a vessel equipped with OptiSave™ means:
- Lower fuel costs for each voyage.
- A cost-effective and sustainable choice without sacrificing reliability.
- Predictable and optimized operational expenses, reducing financial risk.
In today’s fuel-conscious market, selecting an energy-optimized vessel isn’t just about sustainability - it’s a smart financial decision that improves voyage economics.

Related Content:
OPTISAVE™ CUSTOMER STORIES
Marine