The Vauxhall Ampera will be unveiled along with Vauxhall Meriva compact MPV at the upcoming Geneva Motor Show.

The Ampera, which is scheduled for production late next year, is a five-door, four-seater with same design DNA as the latest Astra and Insignia. The Ampera uses extended-range electric vehicle (E-REV) technology, or E-REV. This means the Ampera will use electricity as its primary power source, supplemented by a small engine to generate electricity for its motors when electric power runs low. This helps the Ampera overcome the ‘range anxiety’ issues associated with pure electric cars.

Details about the Ampera, such as a proposed range, top speed or charging cycle, have not been disclosed but expect these and other questions to be answered at Geneva in March.

This might be the only sound your next car ever makes… A gentle swishing of tyres against tarmac as a digital speedometer nudges 100 km/h.

Under the bonnet, the 1.4-litre petrol engine sits silent and dead.

Power is coming from a huge 180 kg, T-shaped battery pack mounted under the floor.

This is the future, as shown by Vauxhall’s stunning new Ampera. Offering the latest lithium-ion technology, it gives the Vauxhall Astra-sized model an electric-only range of 64 kilometers.

The difficulties in developing the world’s first mass-produced extended range battery car should not be underestimated.

First, the battery alone is said to cost in the region of GBP 6 000 – and then there’s an engine which is only designed to work for brief periods.

The solution means that you might find the powerplant bursts spontaneously into life from time to time. This is to set parameters for the on-board diagnostics – and prevent the fuel becoming stale in the tank.

What does impress about this far from fully developed prototype is its acceleration and silence. Top speed is limited to 160 km/h, with a 0 – 100 km/h time of nine seconds, but the 111 kW electric motor provides sizzling kickdown performance, equivalent to that of a 2,5-litre V6 Vauxhall Insignia.

At motorway speeds, there’s a fair bit of roar from the eco Goodyear tyres and a slight fluttering of wind noise. But the final, production-ready, highly aerodynamic Ampera will be a great deal quieter.

Because of the unique way the Vauxhall is powered, direct fuel-consumption comparisons are difficult. But it will emit about 40 g/km of CO2 and have running costs around one-fifth of an equivalent fully loaded Vauxhall Astra.

As for the price, the jury is still out, with GM examining whether to lease the battery pack. As a complete package, including the battery, the Ampera would cost over GBP 35 000 – although the UK Government is talking about £3 000 – £5 000 buyer grants.

At present, the project raises more questions than it answers. But this early drive shows the car has real promise.

Adapted from AutoExpress