Tesla Motors confounded its critics last week, pulling forward by two years its ambitious production plan to build 500k cars a year.

The announcement, made at the same time as Tesla revealed a quarterly loss of $282m, was also accompanied by the departure of its head of production Greg Reichow and head of manufacturing John Ensign.

In the world of Tesla, it was just an average week in which the highs and lows of the automotive industry are compressed into a few days of hectic business.

Typically, Tesla’s announcement of its enormous production hike, based around the mindboggling 400k unit future order bank for the $35k Model 3, was a surprise to most industry observers.

Although Tesla’s press release on the subject made it all sound very matter of fact. "Increasing production fivefold over the next two years will be challenging and will likely require some additional capital, but this is our goal and we will be working hard to achieve it," company CEO, Elon Musk said nonchalantly.

It is difficult to think of an auto industry production ramp-up as rapid as this.  Although Cardiff Business School professor Paul Niewenhuis reckons it can be done "especially with money in the bank".

Tesla’s accounts show it has a reasonable reserve of cash of $1.44b in the bank (not including Model 3 deposits), although bigger car companies typically have at least 10 times this amount of cash at hand.

Questions hang over the production ramp-up because Tesla is an industry minnow building 50k Model S vehicles a year and ramping up output with the addition of the X SUV (pictured) to "between 80k – 90k" a year by the end of 2016.

The new plan calls for the smaller Model 3 to go into production in mid-2017 with first deliveries in late 2017, with the first full year’s production in 2018 in the region of 300k units.

“We plan to incorporate our best technology into Model 3, yet keep it relatively simple to build at high volume and with high quality,” Tesla said in its quarterly report.

Like many Tesla announcements, it prompted more questions than answers – particularly the key one of how it will persuade suppliers to gear-up production for such a huge number of cars when long-term demand is a big unknown.

Tesla has a list of high-quality suppliers for the Model S and X, which share the same aluminium skateboard chassis, battery and motors.