Warships are running out of juice. Modern naval architecture faces a brutal reality check as sensors, electronic warfare suites, and directed-energy weapons demand massive amounts of electrical power. Traditional mechanical drivetrains simply cannot keep up while maintaining high operational efficiency.
South Korea's navy just made a massive bet to fix this exact problem. Leonardo DRS secured a major contract to supply the electric propulsion system for the Republic of Korea Navy's next-generation KDDX destroyer program. This move shifts the entire paradigm of how Seoul plans to fight future maritime conflicts.
Inside the KDDX Propulsion Architecture
You need to look at the hardware to understand why this matters. Leonardo DRS is partnering with Doosan Enerbility to build out the ship's entire power and propulsion network. At the core of this system are the 100-Series permanent magnet propulsion motors paired with variable-frequency drives.
These components aren't just built to move a 6,000 to 7,000-ton hull through the water. They are engineered to save space. Traditional electric drive systems take up massive amounts of internal hull volume. By using compact, power-dense permanent magnet motors, naval architects get that valuable internal space back for other mission-critical systems.
The six-ship KDDX program carries an estimated price tag of roughly $5.7 billion. Hanwha Ocean won the detailed design and lead-ship construction contract worth about $580 million after years of intense domestic competition and bureaucratic delays. Construction is already underway, with the lead ship scheduled for delivery by 2032 and the rest of the class following by 2036.
Why Full-Electric Drive Matters for Modern Destroyers
Old-school warships connect gas turbines or diesel engines straight to the propellers via massive mechanical shafts. That setup works fine for cruising and sprinting, but it creates massive engineering bottlenecks when you try to route electrical power to high-drain combat systems.
Electric propulsion completely decouples the generation of power from the mechanical propulsion of the ship. The engines generate electricity, which feeds a common bus. From there, power can go instantly to the propulsion motors or diverted straight to power-hungry radars and future weapon systems.
John Baylouny, chief executive officer of Leonardo DRS, pointed out that these advanced electric-propulsion technologies give navies the adaptability required for modern electronic warfare, directed energy systems, and charging unmanned vehicles or drone swarms.
Think about what a destroyer has to do today. It has to process thousands of radar tracks simultaneously, operate active electronic jamming arrays, and prepare for incoming hypersonic threats. Gas turbines alone cannot dynamically balance that load without straining mechanical components. Electric drive systems act like a massive shock absorber for a warship's electrical grid.
The Domestic Supply Chain Balance
South Korea isn't just handing its defense sector over to foreign suppliers. The KDDX class is heavily indigenized. The destroyers will feature a domestic combat management system, Hanwha Systems' integrated mast, dual-band active electronically scanned array radars, and local vertical launch systems.
Even the prime power source has a heavy local footprint. GE Aerospace supplies the LM2500+G4 marine gas turbines, but Hanwha Aerospace handles the actual manufacturing of engine components, assembly, and local lifecycle support.
Leonardo DRS isn't walking into this blind, either. They have a decade-long track record supporting the Republic of Korea Navy. Their hybrid electric drive systems already power 20 anti-submarine warfare frigates across the FFX Batch II, III, and IV programs. Furthermore, they scaled this exact type of propulsion technology for the United States Navy's Columbia-class ballistic missile submarines. When you build hardware for nuclear submarines, surface combatants become a familiar engineering challenge.
Filling the Capability Gap
The KDDX class plugs a very specific operational hole for Seoul. The Republic of Korea Navy operates massive 8,200-ton Sejong the Great-class Aegis destroyers, which handle heavy area air defense. On the other end, they operate smaller 4,200-ton KDX-II destroyers.
The KDDX sits right in the middle at roughly 6,000 to 7,000 tons and 155 meters in length. It replaces the aging three-ship Gwanggaeto the Great class and provides a stealthy, highly automated surface combatant capable of operating independently or as part of a carrier strike group.
By committing to a full-electric-drive architecture on these hulls, South Korea is future-proofing its fleet against technologies that haven't even been fully deployed yet.
Stop treating naval propulsion as a boring mechanical footnote. The nation that controls its shipboard electrical grid controls the future of the high seas.
