Everllence's ammonia dual-fuel engine passes final milestone before gas and sea trials

Everllence’s two-stroke ammonia dual-fuel ME-LGIA passed its final test before gas and sea trials, inching the engine platform towards its commercial debut this year.

Eight class societies witnessed the Type Approval Test (TAT) for the ME-LGIA ammonia-burning engine at Everllence’s Research Centre Copenhagen (RCC) during testing from June 10-12.

Bjarne Foldager, head of Two-Stroke Business, Everllence, said, The test confirms the Everllence B&W ME-LGIA “as ready for on-board installation and is the last test before actual sea and gas trials. This engine sets new benchmarks in zero-carbon propulsion and digitally connected performance, and has attracted great interest since its development was announced in 2019.”

Everllence officially marketed the ME-LGIA engines at a two-day event in Copenhagen in November 2025, attended by Marine Propulsion.

The slow-speed engine uses the Diesel-cycle principle and the dual-fuel Liquid Gas Injection concept.

With the first ammonia-burning commercial vessels set to debut this year, Ole Pyndt Hansen, SVP, head of Two-Stroke R&D, Everllence, pointed out that the test will underpin the development of safety and regulatory standards for using the alternative fuel.

“The TAT is also important in relation to maturing IMO ammonia regulations, as it is vital that rules and guidelines are in line with reality to optimise safety onboard vessels. This experience comes from industry, and the first ammonia-driven ships, which are expected to operate at sea during 2026, will act as compelling input for the development of these guidelines,” he said.

A factory acceptance test for the ME-LGIA was held in South Korea in April.

While celebrating progress on the milestone, Everllence said the ammonia TAT marks the “end of an era” at the RCC in Copenhagen as the company prepares to move its research facility outside the city in late 2027.