Turbo-electric transmission uses electric generators to convert the mechanical energy of a turbine (steam or gas) into electric energy and electric motors to convert it back into mechanical energy to power the driveshafts.
Turbo-electric drives are used in some rail locomotives (gas turbines, e.g. with the first TGV) and ships (steam and more recently gas turbines). An advantage of turbo-electric transmission is that it allows the adaptation of high-speed turning turbines to the slowly turning propellers or wheels without the need of a heavy and complex gearbox. It also has the advantage of being able to provide electricity for the ship or train's other electrical systems, such as lighting, computers, radar, and communications equipment.
Ships with turbo-electric drive
- Suamico-class oilers
Coast Guard cutters
- California (later Uruguay), Pennsylvania (later Argentina) and Virginia (later Brazil)
- Canberra – the most powerful steam turbo-electric units in a passenger ship, 42,500 shp (31,700 kW) per shaft, 2 shafts
- RMS Mooltan (as re-engined in 1929)
- Morro Castle and Oriente (later USAT Thomas H. Barry)
- Normandie – most powerful steam turbo-electric passenger ship ever, 40,000 shp (30,000 kW) per shaft (50,000 shp at max power), 4 shafts
- Potsdam and Scharnhorst (later Japanese aircraft carrier Shinyo)
- President Cleveland and President Wilson (originally planned as Admiral W. S. Benson-class transports)
- President Hoover and President Coolidge
- RMS Queen Mary 2 – powered by General Electric gas turbines as well as her diesel generators to generate the current for her four Rolls-Royce electric podded azimuth thrusters
- Santa Clara (later USS Susan B. Anthony)
- Strath-class ocean liners RMS Strathnaver and RMS Strathaird
- RMS Viceroy of India
- Cuba (formerly Powhatan) Converted to small coastal, luxury passenger ship with turbo-electric drive and all electric auxiliaries in 1920.
- Princess Marguerite (II) and Princess Patricia
- TEV Wahine
- TEV Rangatira – possibly the World's last steam-powered turbo-electric ship; scrapped 2005
- Millennium-class cruise ships Celebrity Constellation, Celebrity Infinity, Celebrity Millennium and Celebrity Summit
- Darien (as re-engined in about 1930)
- Cargo and passenger liners (later Mizar-class stores ships) Antigua, USS Ariel, USS Merak, USS Mizar, USS Talamanca and USS Tarazed
- Musa and Platano
- San Benito, later USS Taurus
General cargo ships
- Arauca (later USS Saturn), Antilla and Orizaba
- Union Rotorua (1976) gas turbine
- Union Rotoiti (1977) gas turbine (subsequently replaced with Diesel engines)
- Czarnecki, Joseph (31 January 2001). "Turboelectric drive in American Capital Ships". The Naval Technical Board. NavWeaps.
- Draper, John L (December 1930). "The Paddle Wheel to Electric Drive". Popular Mechanics: 898–902. — detailed article with drawing and charts on turbo-electric drive for ships and the advantages