| Pre 1989 | Detroit Diesel acts as Sales agent for Power Plant |
| 1989 | Acquisition of Marine & Diesel Services in March Wärtsilä Diesel identity formed June 16 Office opens in Granville, NSW |
| 1992 | Local Marine Sales Business Unit originates in Wärtsilä Australia |
| 1994 | Local Power Plant Sales Business Unit originates in Wärtsilä Australia (Perth) |
| 1995 | Office opens in Townsville to support installation & commissioning of Lihir |
| 1997 | Branch office in Wärtsilä Australia (Perth) opens 2-Stroke engineer develops SULZER business |
| 1999 | Granville office relocates to Huntingwood, NSW Service office opens in Wellington, New Zealand |
| 2002 | Seals & Bearings business part of Wärtsilä Australia after Global acquisition Propulsion service established |
| 2006 | Dedicated Fuel & Automative business SYDNEY workshop |
| 2008 | Papua New Guinea service office inaugurated (Nov 2008) Sales presence originates in VIC (Melbourne) |
| 2009 | Relocation of Wärtsilä Australia office to Henderson (May 2009) |
| 2010 | Sales presence originates in SA (Adelaide) |
| 2013 | Implementation of EDL LTS Agreement (Aug 2013) Mobilization of onsite team at McAthur River Mine (Dec 2013) |
| 2014 | Adelaide office closure (Feb 2014) Melbourne office closure (Oct 2014) Auckland office closure (Dec 2014) |
| 2015 | Implementation of 3 year agreement with Newcrest (Feb 2015) Mobilization of onsite team at Lihir Gold Mine (Apr 2015) |
| 2016 | Branch office in WA (Perth) relocates within the suburb of Henderson (May 2016) |