and all of the remaining petrol-only Volkswagen models sold in Brazil are imported. The flex-fuel models currently produced for the local market are the Gol, Fox, CrossFox, Parati, Polo Hatch, Polo Sedan, Saveiro, Golf, and Kombi. By March 2009, Volkswagen do Brasil had attained the milestone mark of two million flex-fuel vehicles produced since 2003. Hybrid vehicles Volkswagen and Sanyo have teamed up to develop a battery system for hybrid cars. Volkswagen head Martin Winterkorn has confirmed the company plans to build compact hybrid electric vehicles. He has stated "There will definitely be compact hybrid models, such as Polo and Golf, and without any great delay", with petrol and diesel power. For example, Golf is the ideal model to go hybrid as the Golf 1.4 TSI was recently awarded the "Auto Environment Certificate" by the Oko-Trend Institute for Environmental Research, and was considered one of the most environmentally friendly vehicles of 2007. Also underway at Volkswagen's Braunschweig R&D facilities in Northern Germany is a hybrid version of the next-generation Touareg. VW intends all future models to have the hybrid option. "Future VW models will fundamentally also be constructed with hybrid concepts," VW head of development Ulrich Hackenberg told Automobilwoche in an interview. Hackenberg mentioned that the car based on the Up! concept seen at Frankfurt Motor Show, as well as all future models, could be offered with either full or partial hybrid options. The rear-engine up! will go into production in 2011. Nothing has been said about plug-in hybrid options. Volkswagen announced at the 2010 Geneva Motor Show the launch of the 2012 Touareg Hybrid, scheduled for 2011. VW also announced plans to introduce diesel-electric hybrid versions of its most popular models in 2012, beginning with the new Jetta, followed by the Golf Hybrid in 2013 together with hybrid versions of the Passat. In 2012, the Volkswagen Jetta Hybrid set the world record to become the fastest hybrid car at . Plug-in electric vehicles In November 2009, Volkswagen announced it has hired Karl-Thomas Neumann as its group chief officer for electric traction. VW's Chief of research, Jürgen Leohold, said in 2010 the company has concluded hydrogen fuel-cell cars are not a viable option. , the Volkswagen Group offers for retails customers nine plug-in electric cars, of which, three are all-electric cars: the Volkswagen e-Up!, e-Golf and Audi R8 e-tron, and six are plug-in hybrids: the Volkswagen Golf GTE, Passat GTE,