Tesla is reporting that its sales in the fourth quarter of 2013 were the highest ever in the company’s history, with almost 6,900 vehicles delivered. The sales in the last quarter of 2013 exceeded expectations by 20 percent, which can also be attributed to higher production numbers.

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Tesla says that the two main drivers of demand last quarter were the top notch safety ratings for the Model S and its great performance under extremely cold conditions. Tesla is on record as the only automaker to have a perfect safety record with zero deaths or serious or permanent injuries in its vehicles. Tesla says that despite dozens of high speed collisions, the drivers and passengers in its vehicles have come away mostly unscathed. The NHTSA also recently gave the Model S its highest safety rating ever and said that it set a new record for the lowest likelihood of injury to occupants.

Due to its electric powertrain, the Model S and Roadster models have better traction in snow and ice than their all-wheel-drive gasoline powered counterparts. Tesla says that its highest sales per capita are in Norway, which has more extreme cold conditions than many parts of the U.S.

So, what’s next for Tesla? Tesla is still hard at work on the Model X crossover and Tesla hopes to start production by the end of this year. The next model after the crossover will be its new “Gen III” electric car, which is planned for 2017 and will be cheaper than the Model S.

+ Tesla Motors