Editing Electric boat (section)

===Decline===
With the advent of the gasoline-powered [[outboard motor]], the use of electric power on boats declined from the 1920s. However, in a few situations, the use of electric boats has persisted from the early 20th century to the present day. One of these is on the [[Königssee]] lake, near [[Berchtesgaden]] in south-eastern [[Germany]]. Here the lake is considered so environmentally sensitive that steam and motor boats have been prohibited since 1909. Instead the [[Bayerische Seenschifffahrt]] company and its predecessors have operated a fleet of electric launches to provide a public passenger service on the lake.<ref>{{cite web | url = http://www.behoerdenwegweiser.bayern.de/dokumente/aufgabenbeschreibung/76666130115 | title = Bayerische Seenschifffahrt GmbH | language = de |trans-title=Bavarian Lakes Maritime Ltd. | publisher = Bavarian State Ministry of the Interior | access-date = 11 July 2011 | url-status = dead | archive-url = https://web.archive.org/web/20110929074446/http://www.behoerdenwegweiser.bayern.de/dokumente/aufgabenbeschreibung/76666130115 | archive-date = 29 September 2011 }}</ref><ref>{{cite web|url=http://www.seenschifffahrt.de/de/unternehmen/geschichte.asp |title=Geschichtliche Hintergründe |language=de |trans-title=Historical Background |publisher=Bayerische Seenschifffahrt |access-date=11 July 2011 |url-status=dead |archive-url=https://web.archive.org/web/20111210004130/http://www.seenschifffahrt.de/de/unternehmen/geschichte.asp |archive-date=10 December 2011}}</ref><ref>{{Cite web|url=http://www.siemens.com/innovation/en/home/pictures-of-the-future/mobility-and-motors/electric-mobility-quiet-cruising-on-koenigssee.html|archive-url=https://web.archive.org/web/20141021033011/http://www.siemens.com/innovation/en/home/pictures-of-the-future/mobility-and-motors/electric-mobility-quiet-cruising-on-koenigssee.html|url-status=dead|archive-date=2014-10-21|title=Electric Mobility: Electric Boats on Bavaria's Lake Koenigssee – Mobility & Motors – Pictures of the Future – Innovation – Home – Siemens Global Website|date=21 October 2014|accessdate=11 March 2023}}</ref>

The first electrically powered submarines were built in the 1890s, such as the Spanish [[Peral Submarine|Peral submarine]], launched in 1888.<ref>{{Citation|journal=Encyclopædia Britannica|title=General Dynamics Corporation|year=1993|edition=15th}}</ref> Since then, electric power has been used almost exclusively for the powering of submarines underwater (traditionally by batteries), although diesel was used for directly powering the propeller while on the surface until the development of [[diesel–electric transmission]] by the US Navy in 1928, in which the propeller was always powered by an electric motor, energy coming from batteries while submerged or diesel generator while surfaced.

The use of combined fuel and electric propulsion (''[[combined diesel–electric or gas]]'', or CODLOG) has gradually been extended over the years to the extent that some modern liners such as the [[Queen Mary 2]] use only electric motors for the actual propulsion, powered by diesel and gas turbine engines. The advantages include being able to run the fuel engines at an optimal speed at all times and being able to mount the electric motor in a [[Azimuth thruster|pod]] which may be rotated by 360° for increased manoeuvrability. Note that this is not actually an ''electric boat'', but rather a variant of [[diesel–electric transmission|diesel–electric]] or [[Turbine–electric transmission|turbine–electric]] propulsion, similar to the diesel or electric propulsion used on [[submarine]]s since [[World War I|WWI]].