Saft to Lithium-Ion Power Europe’s Next-Gen Submarines
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- Saft, a subsidiary of energy giant TotalEnergies, will supply its proprietary lithium-ion battery energy storage systems (BESS) for installation into Naval Group's Barracuda and Scorpene-class nuclear submarines.
- Naval Group announced plans to swap the submarines' decades-old lead-acid battery banks — in service since the Cold War — for Saft's EV-style packs, which the source says offer higher energy density, faster charging, and longer operation on stored power.
- The lithium-ion upgrade allows naval architects to pack more energy into a smaller footprint, freeing internal hull space for other uses and improving living conditions for sailors at sea.
- Saft CEO Cedric Duclos framed the contract as setting 'a new standard in energy density, safety and reliability' and called it 'a clear step forward for European technological sovereignty.'
- TotalEnergies views the deal as strengthening its foothold in European defense programs and confirming growing maritime demand for its advanced battery technology.
- Submarine reactors generate power via steam turbines, but the vessels rely on massive battery banks for silent running, rapid response to power demands, and independent life-support when the reactor is down.
Why it matters: Lead-acid batteries have been the submarine energy-storage bottleneck since the Cold War, and Saft's win puts its TotalEnergies-backed lithium-ion packs into two of Europe's nuclear-submarine programs — a direct shot at technological sovereignty in a defense category where battery weight and volume have always dictated hull design.
