The ELR looks almost identical to the Converj concept car unveiled in 2009, and is undergoing final development ahead of its production launch. GM hasn’t announced many details, but it uses the same T-shaped lithium ion battery, electric motor and four-cylinder engine-generator setup as the Volt and Ampera.

This gives a inner-city driving with zero tailpipe emissions, but with the ability to cover long distances when needed, thanks to a generator which kicks in to stop the batteries running flat. Drivers will be able to refuel the ELR like a conventional car during long-range cruising.

Don Butler, vice president-Cadillac Marketing, commented: ‘The concept generated instant enthusiasm. Like other milestone Cadillac models of the past, the ELR will offer something not otherwise present – the combination of electric propulsion with striking design and the fun of luxury coupe driving.’

Cadillac will, later today, unveil a second concept car at the Pebble Beach Concours d’Elegance in California. Pricing, release dates and global markets for the ELR have not been confirmed as yet.