Euronaval 2026: Everllence returns to submarine diesel generator market

Everllence's PA4 submarine diesel generator-set design, shown in a company rendering. (Everllence)

Engine manufacturer Everllence is developing an updated range of its S.E.M.T. Pielstick PA4-series diesel generator sets for submarines, a company representative told Janes at the Euronaval 2026 exhibition, held in Paris from 3–6 November.

The new PA4 200D Sub range will comprise 12- and 16-cylinder variants offering higher outputs than the previous-generation eight- and 12-cylinder versions. The representative said the 12V 200D generator set is expected to deliver 1.65 MWe, while the 16V 200D version is expected to provide around 2.2 MWe.

Testing and qualification are scheduled within the next 12 months, with the new models expected to be available from 2028, the representative said.

Although the basic engine design remains the same as its predecessors, the company has replaced obsolete equipment and added a new turbocharger, according to the representative.

The PA4 200D generator sets retain a conventional fuel-injection system, which Everllence says is less sensitive to seawater contamination in fuel than common rail systems. The representative said the engines can be started pneumatically during an electrical blackout.

Everllence is offering the generator sets for emergency power generation aboard future nuclear-powered submarines and battery charging aboard conventional submarines. The representative said the higher-output sets would be well suited to conventional submarines equipped with lithium-ion batteries, enabling rapid charging at snorkel depth.

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