STADT - Ship Technology
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Integrated Electric Propulsion Systems for Ships

Moljevegen 50,
N-6083 Gjerdsvika,

STADT AS develops integrated electric propulsion systems and AC drives for marine vessels. The company’s latest product is the STADT Lean Drive innovative electric propulsion system

In December 2015, STADT celebrated its 30th anniversary in the maritime technology sector, and moved to its modern maritime centre in Gjerdsvik, Norway.

Approximately 31 ships in different categories were using the STADT Lean Drive technology by the end of 2015.

Marine drives for electric propulsion systems

The STADT Lean Drive electric propulsion system is the company’s fifth generation of its electric propulsion systems for ships. Available in models from 100kW to 80MW, the system features low and medium voltages up to 15kV.

The system minimises fuel consumption and reduces CO₂, SOx, and NOx pollution. It also performs silently without any electric disturbances.

STADT Lean Drive for propulsion systems

The STADT Lean Drive electric propulsion system is the product of four years of research and development.

Company director Hallvard Slettevoll describes the new system as a ‘breakthrough in technology’, because it combines the unique features of pure sinusoidal electric power for the main switchboard, electric motors and other electric consumers while minimising space occupation and cost.

Sinusoidal waveform on current and voltage protects sensitive electronic equipment from interference by inverter drives, such as echo sounders, radars, and seismic research instrumentation. It also minimises noise produced by electric motors and drives and guarantees protection from bearing damages.

This gives STADT’s system an edge over other well-known electric drives suppliers, who have supplied systems with a high degree of electric noise / pollution in their main switchboard grids, as well as EMI (EMC) to the surroundings.

Silent and space-saving electric propulsion system

Since large propulsion transformers are not required, the STADT Lean Drive propulsion system saves space and achieves a total harmonic distortion (THD) level of less than 2%.

Sustainable and robust technology

STADT Lean Drive is extremely reliable and offers a long lifespan of 30 years or more.

This durability is achieved by using fewer components in the drive system, as well as different parallel technologies that are redundant to each other.

System integration

STADT has extensive experience in system design and integration for different kinds of ship projects.

Our broad range of system components, in different types of technologies, enables us to design optimum solutions for each individual project.

Lean Drive

STADT LEAN Drive is the company's patented solution for start and control of big electrical motor loads in the shipping industry.

System Integration

STADT is a supplier of integrated electric propulsion systems, which the company refers to as LEAN Propulsion Design.


We offer custom-made asynchronous motors for any application in the shipping sector.


STADT designs and delivers custom-made, state-of-the-art, marine switchboards tailored according to customer specification.

Power Management System

The STADT PMS features functions required for controlling power generation and distribution on board a vessel, including generators, synchronisers, governors and main switchboard breakers.

Advanced Ship Propulsion Systems

A reliable propulsion system is crucial for ship safety. It enables the vessel to complete operations around the world and maintain its sailing schedule.

VariAC Lean Propulsion for Vessels

STADT Lean Drive technology is available in many options to control the propeller power by regulating both the pitch and the RPM of the propeller.

White Rabbit Megayacht Commissioned

STADT has finalised installation of the Lean Propulsion system on the megayacht White Rabbit, built at Echo Yachts in Perth Australia.

STADT Signs Representatives in the US

During the last Work Boat Show in New Orleans, US, STADT signed an agreement with WA Technical Sales Inc to represent the company in the Gulf of Mexico area.

Kongsberg Superyacht Contract Granted to Stadt

STADT AS has been granted the Kongsberg Maritime AS contract to provide their awarded No-Loss AC drive system for a 84 metre Superyacht, which will be built by ECHO YACHTs in Australia.

STADT Releases White Paper on Sustainable Electric Propulsion

A new technology for speed and power control of larger machinery operated via AC motor drives has been introduced to the shipping market. The patented STADT STASCHO Sinus drive technology was first delivered to the seismic research vessel “Sanco Star “of Norway, operated by RXT. In this case th

STADT Uploads Free White Paper about its Low-Loss Electric Propulsion System

STADT, a specialist in AC drives and integrated electric propulsion systems for ships, has uploaded a free white paper about its new STADT Stascho low-loss electric propulsion system. STADT Stascho utilises sinus technology rather than the widely used PWM, and this completely eliminates electroma

Stadt Introduces Energy Saving AC Motordrives

A new technology for speed and power control of bigger machinery operated via AC motordrives has been launched to the shipping market. The patented drive technology was first delivered to the seismic research vessel MS Sanco Star of Norway. In this case the drives was used for the main ele