Finnish plug-in hybrid sports car maker Fisker Automotive Inc. has just raised a further $100 million in investments from undisclosed stakeholders. The investment comes just prior to the company delivering production cars to its first customers.

Fisker submitted the funds to the US Securities and Exchange Commission last Friday, but did not name the investors. The company has only just finished raising $190 million in an additional investment round in March, pushing the total raised funds above $1 billion. The extra $100 million is expected to ensure an initial production target of 3000 units for the Fisker Karma is met.

The company's first car to be launched, the Fisker Karma, is set to appear in showrooms in May and June this year, with the first customer deliveries to begin a month or two later. Its launched has been almost two years in the making now after a number of hold ups forced the company to delay its initial plans in 2009, and then again in 2010.

The Karma is powered by a 2.0-litre Ecotec turbocharged petrol motor, as well as an electric hybrid setup. Average fuel consumption is rated at 2.4L/100km, while performance from 0-100km/h can be achieved in 5.8 seconds.

The price of the extended-range plug-in hybrid has crept up in the delay, and now retails for $US95,500 ($90,460) instead of the initial asking price of $US88,000 ($83,360).