Spain proposes four Navantia Alfa 4000 ships by 2031 for Sweden's Luleå-class frigate competition.

Navantia Chief Operating Officer Gonzalo Mateo-Guerrero officially disclosed a €3 billion commercial offer for the Swedish Luleå-class frigate program. Announced on April 16, 2026, this strategic proposal includes the delivery of four Alfa 4000 ships by 2031 to significantly enhance the maritime defense capabilities of Sweden within the NATO alliance. The new Swedish frigate will provide a sixfold increase in displacement compared to the current Visby-class corvettes, extending endurance and expanded mission profiles in the Baltic Sea.

The proposed Alfa 4000 frigate features a 4300-tonne displacement along with a 16-cell vertical launch system for surface-to-air missiles and advanced sonar suites for anti-submarine warfare. Navantia intends to integrate domestic Swedish technology, including Saab combat management systems and national weapons, to ensure sovereign control over fleet operations. This bid enters a high-stakes competitive field alongside the French FDI design and the Saab Babcock Arrowhead 120 as Stockholm prepares for a final supplier selection in early 2026.

Related topic: UK confirms exclusive Arrowhead 120 frigate bid for Sweden's $6 Billion Luleå-class competition

The Alfa 4000 is a 120-meter, 4,300-ton multi-domain frigate with a 16-cell vertical launch system for air defense, long-range anti-ship missiles, and integrated hull and towed sonars for anti-submarine warfare alongside a hangar for medium helicopters like the NH-90 or SH-60. (Picture source: Navantia)

In an interview with Dagens Nyheter on April 16, 2026, Navantia Chief Operating Officer Gonzalo Mateo-Guerrero disclosed the Spanish company’s commercial offer for Sweden’s Luleå-class frigate program, setting a price of €3 billion, equivalent to about SEK 33 billion, for four completed ships delivered without missiles, torpedoes, or long-term support. He also indicated that the final cost could increase depending on the scope of the contract, including whether weapons and maintenance are incorporated, and that the previous contract estimate was within a higher overall cost range of SEK 40 to 60 billion, equivalent to €3.6 to €5.4 billion.

Navantia also announced on April 13, 2026, its commitment to deliver two units to Sweden by 2030 and two additional ships by 2031, as Stockholm prepares to select a supplier in early 2026. The two competing proposals include France's Naval Group with the FDI frigate and Saab in partnership with Babcock on the Arrowhead 120. The Luleå-class's requirement framework specifies ships longer than 120 meters, displacing between 3,000 and 4,500 tonnes, and entering service with an initial operational capability target of 2030. The Swedish requirement has been restructured between 2023 and 2024, reducing the planned fleet from five to four ships while maintaining the objective of replacing the Visby-class corvettes.

The ships displace about 650 tonnes, while Luleå-class vessels are expected to be in the 4,000-tonne category, increasing displacement by a factor of six and enabling extended endurance and expanded mission profiles. The operational requirement also defines three primary roles: air defense based on vertical launch systems, anti-submarine warfare using hull-mounted and towed sonar systems, and surface warfare with anti-ship missiles. The delivery schedule requires two ships by 2030 and the remaining two within a 2030 to 2035 window, reflecting constraints linked to Sweden’s NATO integration after March 7, 2024, and the need to secure Baltic Sea maritime routes under alliance planning timelines.

The Alfa 4000 proposed by Navantia is specified at about 4,300 tonnes full load, with an overall length close to 120 meters and a beam of about 16.2 meters. Using a combined diesel-diesel propulsion system with electric assist through PTO and PTI modes to enable both propulsion and low acoustic operation for anti-submarine missions, the Spanish frigate can reach speeds above 27 knots and a range of about 4,500 nautical miles at 15 knots. The ship is configured for a crew between 100 and 150 personnel, depending on mission configuration, and supports a single medium helicopter such as NH-90 or SH-60 with a hangar and flight deck. Designed for an endurance of about 30 days, the Alfa 4000 is positioned below larger frigates like the 5,700-tonne Type 31 while remaining close to the 4,460-tonne FDI.

The combat system of the Alfa 4000 includes a vertical launch system (VLS) with 16 cells for surface-to-air missiles, with missile type left open to Swedish selection and likely aligned with ESSM-class interceptors, supported by a 3D radar and electronic warfare systems for detection and countermeasures. Surface warfare capability includes between 8 and 16 anti-ship missiles compatible with systems such as RBS-15 and a main gun in the 57 mm or 76 mm class, depending on the customer's requirement. For the third requirement, anti-submarine warfare, the Alfa 4000 integrates a hull-mounted sonar, a towed array sonar, and helicopter-based sensors linked through the combat management system to enable coordinated targeting.

The Spanish frigate is also equipped with two triple torpedo launchers, one close-in weapon system (CIWS), as well as two 30 mm or 40 mm guns complemented with decoy launchers. However, like the FDI, the 16-cell VLS capacity limits sustained air defense compared to vessels equipped with 32 cells, therefore constraining engagement depth in high-intensity scenarios. As noted by Gonzalo Mateo-Guerrero, the cost structure for the Luleå-class program separates the frigate acquisition from combat systems and lifecycle elements, with a baseline price of €750 million per ship for the hull and onboard systems excluding weapons and support.

Earlier Swedish program estimates ranged between SEK 40 and 60 billion, equivalent to €3.6 to €5.4 billion, resulting in a total unit cost between €0.9 and €1.3 billion once missiles, torpedoes, integration, and long-term maintenance are included. This difference logically indicates that non-hull components account for a significant share of total expenditure, estimated between 30 and 70 percent, reflecting the whole cost of sensors, weapons, integration, and sustainment over the operational life of the ships.

The industrial model proposed by Navantia includes the integration of Swedish systems such as Saab’s 9LV combat management system, national sensors, RBS-15 anti-ship missiles, and torpedoes, while allowing hull construction outside Sweden and concentrating domestic work on system integration, outfitting, and long-term support within Swedish facilities. This approach aligns with Sweden’s industrial strategy, which prioritizes control over combat systems and operational support rather than domestic hull construction. This also follows a precedent where hulls are built abroad and completed domestically, preserving high-value industrial competencies while reducing the requirement for local shipbuilding infrastructure.

The delivery schedule proposed by Navantia requires a four-year interval between contract award in 2026 and delivery of the first ship in 2030, which is shorter than the six to eight years typically observed for European frigate programs. Unlike the other two proposals, the Alfa 4000 has not yet been built and therefore lacks an operational reference, introducing possible uncertainties for Swedish planners about design maturity, system integration sequencing, and configuration changes required to meet Swedish specifications. Achieving this schedule requires either a mature design at contract signature or acceptance of concurrency between design and construction.

Both of them increase the exposure to integration risks, particularly in areas such as propulsion systems, combat system architecture, and overall configuration management during the build process, similar to the Constellation-class frigate in the U.S. In the competitive context, the Alfa 4000 is evaluated alongside Naval Group’s FDI frigate, which entered French service in October 2025 with a displacement of about 4,460 tonnes and 16 vertical launch cells (a system which will be upgraded to 32 cells in the future), and the Saab/Babcock Arrowhead 120 design (a shorter variant of the Type 31 frigate), which falls within a displacement range of about 4,000 to 4,650 tonnes with up to 16 VLS cells and modular internal arrangements.

For now, Sweden assesses cost, industrial participation, delivery timelines, and technical risk before a final decision expected in early 2026. To remain neutral, the Alfa 4000 offers the lowest disclosed unit cost but carries higher uncertainty due to the absence of an in-service reference, while the FDI provides a proven configuration with a higher level of design maturity but without any disclosed price and the Saab-Babcock proposal emphasizes domestic industrial participation on a design still under development, creating for the three frigates a trade-off between cost, maturity, and industrial considerations.

Written by Jérôme Brahy

Jérôme Brahy is a defense analyst and documentalist at Army Recognition. He specializes in naval modernization, aviation, drones, armored vehicles, and artillery, with a focus on strategic developments in the United States, China, Ukraine, Russia, Türkiye, and Belgium. His analyses go beyond the facts, providing context, identifying key actors, and explaining why defense news matters on a global scale.