STADT

What STADT does

STADT AS is a Norwegian privately-held, family-owned enterprise founded in 1985 by Hallvard L. Slettevoll, headquartered in Gjerdsvika, Norway (firmographic listing shows Aurskog). The company designs and delivers integrated electric propulsion systems for marine vessels, with naval/defence as its primary served vertical and additional exposure to offshore, passenger/cruise, fishing, seismic/research, yacht, tanker/bunker, merchant/cargo, aquaculture, and energy systems segments. Notable customers include the Polish Navy (submarine rescue vessel 'Ratownik'), Norwegian Navy (stealth verification), Norwegian Coast Guard (1996 breakthrough contract for K/V Tromsø), UK Ministry of Defence/BAE Systems (Type 26 Frigate engagement), and Hurtigruten (passenger vessels). The group operates through wholly-owned subsidiaries STADT NAVAL AS (naval focus), STADT Eigedom AS (real estate), and In Motion AS, with regional offices in Singapore and Rome plus representation in Japan and partnership presence in Gdynia, Poland.\n\nThe company's core technology is the patented LEAN Propulsion system, a modular integrated electric propulsion platform based on pure sinusoidal AC power distribution rather than DC or PWM-based architectures. The product portfolio includes the patented LEAN Drive (100 kW to 30 MW per motor), custom asynchronous motors, low and medium-voltage marine switchboards (up to 15 kVac, 4000 A), synchronous generators (100 kW to 20 MW), the DNV-GL-approved Energy Storage System, FC variable frequency drives (1-4000 kW), DN soft starters, distribution transformers, Power Management Systems, and an Integrated Automation System certified by DNV-GL, ABS, BV, and LR. The LEAN Drive combines multi-speed motors with VFD transistors, thyristors (RVS), and bypass circuit breakers (BP) coupled to controllable pitch propellers, enabling transformerless operation, 0.1% energy losses in electric drives, elimination of THD/EMI/PWM, and a 30+ year operational lifespan through reduced component count and parallel power redundancy.\n\nSTADT operates a direct enterprise field-sales model targeting naval ministries, shipbuilders, and commercial vessel operators. Revenue is generated through custom hardware sales of integrated LEAN Propulsion systems and standalone components, professional engineering services (system integration, marine grid surveys, power quality analysis), and managed service contracts (commissioning and lifecycle maintenance). All pricing is quote-based with multi-year contract cadence tied to newbuild and retrofit programmes. The company actively pursues event-driven GTM through major defence and maritime exhibitions (DSA NATSEC Asia, Navalia, Nordic Defence Forum, Navy Leaders), supported by a content marketing presence via stadt.no, LinkedIn, YouTube, and Facebook, and is ISO 9001 certified across its quality management system.

Name

STADT

Legal name

STADT AS

Website

https://stadt.no

Company type

Private

Founded year

1985

Operating status

Operating

Headcount range

11–50 employees

Short description

STADT AS is a Norwegian family-owned marine propulsion specialist that designs integrated electric propulsion systems based on patented pure sinusoidal AC LEAN Drive technology, serving naval, offshore, passenger, fishing, and research vessel operators worldwide through direct enterprise sales and shipyard partnerships.

Ownership category

akta.pro rank

Product category

Marine Electric Propulsion Systems

NAICS

Engine, Turbine, and Power Transmission Equipment Manufacturing (33361), Turbine and Turbine Generator Set Units Manufacturing (333611), Power, Distribution, and Specialty Transformer Manufacturing (335311)

SIC

Engines & Turbines (3510), Motors & Generators (3621)

akta.pro primary industry

Marine Hybrid & Electric Propulsion Systems (IMAJAHAC)

akta.pro secondary industries

Propulsion, Power & Energy Systems Design (Diesel, Hybrid, Electric, Alternative Fuels) (IMAJAGAE), Marine Generators, Alternators & Power Electronics (Gen-sets, VFDs, converters) (IMAJAHAI), Propulsion Control, Monitoring & Automation (ECS, PMS interface) (IMAJAHAH), Shipboard Propulsion, Power Generation & Energy Storage (IMABAKAF)

Keywords

• Marine electric propulsion
• Ship AC drives
• Naval power systems
• Vessel hybrid propulsion
• Marine electrical systems

Headquarters

HQ city

Aurskog

HQ country

Norway

HQ region

Europe

Offices5 records

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

Personnel, Supply Chain, Operations, Technology or R&D, Marketing or Sales

Revenue model

1. Integrated Electric Propulsion Systems: STADT designs and delivers complete integrated electric propulsion systems (LEAN Propulsion Design) including generators, energy storage, switchboards, transformers, LEAN Drive, propulsion motors, automation systems, gearboxes, and controllable pitch propellers. Revenue is generated through custom system sales for newbuild and retrofit projects.
2. Power Electronics Products: Sale of individual products including FC Drives, soft starters, motors, generators, switchboards, transformers, and energy storage systems. Products are available as standalone units or integrated into complete systems.
3. System Integration Services: Engineering, design, testing, and documentation services for propulsion system integration. Includes marine grid surveys, power quality analysis, and custom engineering solutions adapted to vessel operational profiles.
4. Service and Maintenance: Dedicated service organization providing commissioning, start-up, and ongoing maintenance support for STADT systems globally through multiple service locations.

Pricing tiers

Go-to-market motion2 records

Distribution channels6 records

Marketing channels11 records

Core offering

STADT designs and manufactures integrated electric propulsion systems for vessels, centered on the patented LEAN Propulsion technology that uses pure sinusoidal AC power distribution rather than DC or PWM-based alternatives. The company delivers drives, motors, switchboards, generators, and energy storage systems to naval, commercial, and offshore ship operators worldwide.

Product overview

STADT offers a comprehensive integrated electric propulsion system portfolio for marine vessels, centered on its proprietary LEAN Propulsion® Design. The product range spans power generation (Generators), distribution (Switchboards, Transformers), power conversion and control (LEAN Drive, FC Drive, Soft Starter), energy storage (ESS), motor drives (Motors), automation (PMS, IAS), and services (Marine Grid Survey). The LEAN Drive is the core patented technology featuring bypass operation for zero harmonic distortion, zero EMI, and minimal energy losses (0.1%), enabling 30+ year lifespan. Products scale from 100 kW to 100 MW per motor and serve naval (stealth/electric propulsion), commercial (offshore, cruise, fishing, merchant), and research vessels. DNV-GL is the primary marine classification, with other societies available on request.

Differentiator

Problem solved

Functional benefit

Products and services

• LEAN Propulsion System Integrated electric propulsion package based on patented pure sinusoidal AC power distribution, replacing conventional DC-link and PWM-based architectures. Designed for naval, offshore, commercial, passenger, fishing, and yacht vessels seeking lower maintenance, reduced harmonic losses, and improved motor lifetime.
• LEAN Drive Patented AC drive unit that forms the core of the LEAN Propulsion architecture, using pure sinusoidal AC power to drive marine propulsion motors without the DC-link and PWM-related insulation stress of conventional drives.
• Electric Propulsion Motors Marine-grade electric motors designed to operate with the LEAN sinusoidal AC drive architecture, delivering high reliability and long service life under harsh maritime conditions.
• Marine Switchboards Power distribution switchboards engineered for integration with the LEAN Propulsion system, providing vessel-wide AC power management and protection.
• Marine Generators Synchronous and asynchronous generators supplied as part of STADT's integrated electric propulsion packages, supporting both conventional and hybrid vessel configurations.
• Energy Storage Systems (ESS) Battery-based energy storage systems integrated into the LEAN Propulsion architecture to enable hybrid and fully electric vessel operation, supporting peak shaving, spinning reserve, and zero-emission running profiles.

Quantifiable outcome

• Energy losses reduced to 0.1% in electric drives
• +3 more outcomes

Named customers10 records

Segments10 records

Ideal customer profiles2 records

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature7 records

Partnerships

Five partnerships are on record, tiered minor and core.

• NTNU (Norwegian University of Science and Technology)minorStrategic or Co-development Partner · 24 April 2026Professor Vilmar Æsøy from NTNU highlighted reliability challenges in hybrid electric propulsion systems at Blue Maritime Cluster seminar. STADT presented PWM vs Sinusoidal AC Drive Technology as solution to common mode voltage and harmonic problems.
• DNVminorStrategic or Co-development Partner · 24 April 2026DNV confirmed awareness of reliability consequences of hybrid electric systems and announced intensified focus on regulatory aspects. STADT's sinusoidal AC technology presented as solution for compliance.
• Sintef EnergyminorStrategic or Co-development Partner · 24 April 2026Sintef Energy presented their view on problems with hybrid electric propulsion systems at Blue Maritime Cluster seminar in Ålesund.
• PGZ Stocznia WojennacoreStrategic or Co-development Partner · 11 February 2026Strategic partnership for construction of Polish Navy's submarine rescue vessel 'Ratownik'. STADT delivers its patented Lean Propulsion System with 11,000 kWe electric drive. This is STADT's fourth naval ship project in Poland. PGZ Stocznia Wojenna (founded 1922) is Poland's oldest continuously operating shipyard and member of Polish Armaments Group (PGZ). The 96-meter vessel features 5 controllable pitch propellers and is designed for submarine rescue and seabed infrastructure protection.
• BAE Systems / Team UKcoreStrategic or Co-development Partner · 23 January 2026UK-Norway government-to-government agreement for Type 26 Frigate Programme. BAE Systems leads industrial cooperation with Norwegian partners. STADT hosted BAE Systems and Team UK at their Maritime Center in Gjerdsvika for presentations and discussions on naval vessel electrification and requirements for unmanned/autonomous vessels.

Scale indicators8 records

Recent moves6 records

Expansion highlights6 records

Broad incumbents

• Wärtsilä: Finnish global leader in marine engines, hybrid propulsion, and energy storage, competing in the same integrated electric propulsion and naval auxiliary space that STADT serves.
• Kongsberg Maritime: Norwegian-headquartered marine technology incumbent delivering hybrid/electric propulsion, integrated automation, and naval systems through its propulsion and maritime divisions, with substantially larger scale than STADT.
• ABB Marine & Ports: ABB's Marine & Ports division supplies full electric, hybrid, and integrated power & propulsion systems for naval and commercial vessels worldwide — the most direct broad incumbent competitor to STADT's LEAN Propulsion offering across generators, drives, switchboards, and energy storage.
• MAN Energy Solutions: Global engine/propulsion specialist (and via its marine electrification push via 'MAN Pure Gas' and electrolyzer systems) competes with STADT in supplying naval-integrated power and propulsion systems.
• Caterpillar Marine (MaK / Cat Marine Power): Supplies marine diesel-electric propulsion, generators, and integrated power systems serving naval and commercial segments, comparable to STADT's full-scope generator, drive, and switchboard offerings.
• GE Vernova (Marine Solutions) / GE Power Conversion: Provides marine electric propulsion, drives, and integrated power systems to naval fleets (Type 26 frigate adjacent programs), competing with STADT for integrated electric propulsion design wins.
• Rolls-Royce Power Systems (MTU) / Power Lab: Supplies naval hybrid propulsion systems (MTU Series 4000, PowerPack) and increasingly integrated electric solutions for naval and patrol vessels, overlapping the integrated electric propulsion market STADT serves.
• Siemens Energy (Marine Electrification): Provides marine electrical propulsion systems (SiPOD, BlueDrive) with significant naval and cruise reference base, overlapping directly with STADT's pure-electric and hybrid propulsion solutions.

Direct peers

• Danfoss Editron: Specializes in marine hybrid and electric drivetrains based on DC-bus architectures, targeting the same vessels segments (offshore, commercial, naval) with a different (DC) technical approach versus STADT's pure-AC LEAN Propulsion.

Others

• Vacon Drives (now Danfoss Drives): STADT's original CPU/technology partner from 1995 and first Vacon customer outside Finland; today Danfoss Drives supplies marine AC drives that overlap with STADT's FC Drive product line, making it both a historic technology supplier and adjacent commercial competitor.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks6 records

Key highlights7 records

Customer concentration

• YouTubeyoutube.com/channel/UCTtkQF8M0oqRUIE9Qu73u1w
• Facebookfacebook.com/stadt.as
• LinkedInlinkedin.com/company/stadt-as
• Xx.com/stadt_as

Compliance7 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles1 record

Subsidiaries4 records

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about STADT