Workers at General Motors' van plant in Luton, Bedfordshire, are to begin a campaign to secure production of a new electric car.
Business Secretary Lord Mandelson unveiled the car at the Labour Conference. He said the plant's new owner Magna wanted to keep Luton jobs.
Alternative production sites are the GM plant at Ellesmere Port, Cheshire, or elsewhere in Europe.
Workers hope production will start in Luton by 2012 when van production ends.
Rachel Hopkins from Luton North Labour Party said workers, management, the borough council, MPs and the government should now come together to begin an intensive lobbying campaign.
The car has a range of 40 miles on electric battery power before a recharge is needed and another 240 miles on a petrol-driven generator.