Under the deal, Stolt Tankers will deploy the technology on seven tankers.
The latest order was placed by Stolt Tankers after the installation and assessment of the technology on board the Stolt Breland at the start of the year.
Stolt Tankers, which claims to run the largest fleet of chemical tankers in the world, aims to lower emissions by prioritising voyage efficiency solutions.
Compatible with any marine fuel, FuelOpt is said to boost fuel savings through energy efficiency.
In addition to future-proofing for possible new fuels, the system enables customers to use all existing fuels.
Designed for installation on older vessels or newbuilds, the propulsion optimisation technology is also compatible with any propeller or engine.
Yara Marine Technologies chief sales officer Aleksander Askeland said: “We are proud to support Stolt Tankers with technology solutions that meet their immediate needs, while also allowing for additional enhancements further down the road to Net Zero.
“Increased fuel efficiency already plays a key role in cost-effective operations, and will no doubt continue to be a vital part of dealing with the expense of future fuels and upcoming regulations.”
To help Stena Line lower its fleet’s carbon emissions, Yara Marine will deploy its shore power solution on board four ferries.