BMW will be taking its fleet of i-branded electrified concepts to the 2013 Geneva Motor Show in early March, including the i8 Spyder plug-in hybrid sports car, the original i3 electric car and the more recent i3 Coupe sports version.

On top of this, BMW has also confirmed details for the extended-range version of the i3.

The automaker has revealed that with its optional range extender, believed to be a twin-cylinder gasoline engine borrowed from BMW’s motorcycle range, the i3 electric car will be able to drive approximately 186 miles.

This range is only achievable using a full charge of the battery and a full, albeit small, tank of gasoline.

Without the range extender, BMW says its i3 should still be able to cover a reasonable 80 to 100 miles on a single charge, which would be ideal for urban environments.

No other details have been revealed, though we already know that the i3 will be revealed in production trim in late summer and should be on sale in the U.S. by the end of the year. The car’s electric motor will be rated at 125 kilowatts (170 horsepower) and will be powered by a lithium-ion battery. The motor will be rear-mounted and power the rear wheels exclusively.

The i3’s chassis will be fully composed of aluminum and store the battery to help lower the center of gravity. Attached to this will be a carbon fiber body, whose construction serves as a safety cell for occupants. All of the i3’s carbon fiber is being sourced from a plant in the U.S.

Pricing of the BMW i3 will be announced closer to launch. The production version of the i8 will be revealed around the same time as the i3 but won’t go on sale until 2014.

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