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Tesla teases Model S prior to debut

Prior to its world debut on March 26, Tesla has decided to whet the appetites of green-car fans by releasing a teaser image of its upcoming Model S sedan. Under the direction of former Mazda designer Franz von Holzhausen, the Model S features a rounded front nose, a front fender plate with an affixed Tesla emblem and a noticeably shorter hoodline. Unlike the Fisker Karma, the Model S will be powered solely on battery propulsion and do without a range-extending engine, which helps accommodate the shorter hood.

Fisker Karma gets EPA certification

Fisker Automotive received its U.S. Environmental Protection Agency certification this week, which means sales of the 2012 Karma sedan can begin. The Karma is a series plug-in hybrid, powered by a lithium-ion battery and a 2.0-liter range-extending gasoline engine.

MIT researchers rethink electric-car batteries

Researchers at the Massachusetts Institute of Technology say a new battery design for electric vehicles could be a lightweight and inexpensive alternative. The goal for the team's three-year project, launched in September 2010, is to have a functioning prototype ready to be engineered as a replacement for existing electric-car batteries. At this point in the project, the prototype uses a “semi-solid flow” to separate the two functions of a battery--storing energy and discharging it when needed--into separate physical structures.