# Korean shipyards pitch hybrid electric frigates across Southeast Asia *Naval builders combine gas turbines and electric drives to cut radiated noise as Manila expands its surface combatant fleet.* **Published:** August 31, 2026 **By:** Hyun-jung Lee **Section:** Shipbuilding & Defense — South Korea **Format:** Why It Matters **Confidence:** high **Source:** https://eastasiabrief.com/shipbuilding/korean-shipyards-pitch-hybrid-electric-frigates-across-southeast-asia-130 **Publisher:** East Asia Brief (https://eastasiabrief.com/) --- ## What to know - The delivery of ROKS Gyeongbuk confirmed the operational rollout of a combined diesel-electric or gas turbine arrangement. - Domestic shipyards are transferring this propulsion integration experience into foreign sales campaigns. ![An engineer stands beside propulsion machinery at a shipyard with a modern naval frigate docked in the background. (AI-generated image)](https://eastasiabrief.com/media/2026-08-30-047b5e3383a4.webp) *An engineer stands beside propulsion machinery at a shipyard with a modern naval frigate docked in the background. (AI-generated image)* South Korea's Defense Acquisition Program Administration announced June 19, 2026, the delivery of the second Ulsan-class Batch-III frigate, detailing a hybrid electric drive system now anchoring shipbuilders' naval export bids across Southeast Asia. The delivery of ROKS Gyeongbuk confirmed the operational rollout of a combined diesel-electric or gas turbine arrangement. The configuration pairs one gas turbine with two electric propulsion motors to suppress acoustic signatures during submarine tracking. Domestic shipyards are transferring this propulsion integration experience into foreign sales campaigns. Naval planners across the Association of Southeast Asian Nations are seeking multi-role frigates capable of shallow-water acoustic discretion and long-range patrol endurance. HD Hyundai Heavy Industries signed an 844.7 billion won ($578 million) contract with the Philippine Department of National Defense on Dec. 26, 2025, to build two 3,200-ton frigates. That deal followed the earlier delivery of two 2,600-ton Jose Rizal-class frigates in 2020 and 2021. The Philippine contract forms part of the Horizon modernization program, which funds fleet expansion to secure exclusive economic zones. Manila scheduled delivery of both 3,200-ton vessels for the second half of 2029. South Korean yards have used hybrid electric drive (HED) architectures to separate cruising modes from combat sprints. In standard anti-submarine screening, diesel generators feed high-voltage electric motors that turn the propeller shafts directly. This electric mode removes mechanical reduction gearbox noise and diesel engine vibration from the hull structure. Lower underwater radiated noise expands the detection range of the ship's towed-array sonar while denying early warning to opposing diesel-electric submarines. When tactical situations demand maximum sprint speeds above 28 knots, clutches engage the high-output gas turbine. That dual-mode powertrain reduces overall machinery wear and lowers fuel consumption during low-speed maritime security patrols. Shipbuilders developed this machinery control software across multiple domestic naval programs. HD Hyundai Heavy Industries delivered the 8,200-ton Aegis destroyer ROKS Jeongjo the Great on Nov. 27, 2024, integrating four gas turbines with two auxiliary HED electric motors. The company refined high-voltage propulsion drives and power management systems on the lead Batch-III frigate ROKS Chungnam. Those platforms proved that domestic electrical integration could handle rapid mode switching without electrical bus instability. Korean naval architects are now proposing standard export variants based on these proven hulls. The HDF-3200 and HDF-3500 designs offer navies the choice between conventional diesel layouts and hybrid electric machinery arrangements. For Southeast Asian procurement offices, propulsion choices involve trade-offs between acquisition cost and mission profile. A combined diesel and diesel (CODAD) plant carries lower upfront machinery costs and simpler maintenance routines for regional ship repair facilities. Hybrid electric configurations increase initial shipyard procurement costs due to high-capacity converters, propulsion motors and specialized switchboards. They also demand specialized shore training for naval technical ratings responsible for high-voltage power networks. Operational cost calculations favor the hybrid layout over a thirty-year hull life cycle. Electric cruising burns less fuel during routine economic zone surveillance, offsetting initial capital expenditure through lower operational logistics requirements. Naval defense analysts note that submarine proliferation across the South China Sea has elevated anti-submarine warfare requirements. Regional navies are moving beyond basic offshore patrol vessels toward acoustically quiet surface combatants equipped with variable-depth active sonars. The specific propulsion machinery layout for Manila's newest 3,200-ton frigate order remains proprietary under defense procurement clauses. The Philippine Department of National Defense has not published the exact engine model selections for the 2029 hulls. South Korean yards are competing against European shipbuilders, including Naval Group, Damen and Navantia, in export tenders throughout Southeast Asia and South America. European builders have marketed hybrid-drive frigates to international customers for over a decade. Seoul's shipbuilders counter that competition by offering shorter construction schedules backed by commercial shipyard capacity. Integrated commercial supply chains allow South Korean yards to manufacture hulls, install propulsion trains and complete harbor acceptance trials on compressed timetables. Sub-tier suppliers in South Korea produce the high-voltage switchgear, propulsion transformers and local machinery control units. Securing foreign sales orders provides domestic component manufacturers with production volume outside the cyclical naval shipbuilding plans of the Republic of Korea Navy. The Philippine Department of National Defense and HD Hyundai Heavy Industries will finalize detailed design milestones for the two 3,200-ton export frigates ahead of first steel cutting scheduled at the Ulsan shipyard in 2027. ## Impact map | Event | Korea | China | Japan | Global impact | | --- | --- | --- | --- | --- | | Naval hybrid electric propulsion export | shipyard systems integration | regional naval surveillance tracking | maritime equipment export competition | ASW frigate procurement cost | ## In this story - **Companies:** HD Hyundai Heavy Industries - **Tickers:** 329180.KS - **Exposed:** Naval Group, Navantia, Damen Shipyards - **Policy:** Economic Security - **Impact:** Supply Chain, Order Book, Cost Structure ## Primary sources 1. dapa.go.kr 2. korea.kr 3. newswhoplus.com 4. daum.net 5. hd.com --- Cite as: East Asia Brief, "Korean shipyards pitch hybrid electric frigates across Southeast Asia," August 31, 2026. https://eastasiabrief.com/shipbuilding/korean-shipyards-pitch-hybrid-electric-frigates-across-southeast-asia-130