The 50^th anniversary of Australia's premier motorsport category gracing Symmons Plains saw Kiwi pole-sitter Shane van Gisbergen lead all the way to win a wet and windy 200-kilometre race.

And while the event marked the end of the existing agreement with the Tasmanian government, Supercars chief operating officer Shane Howard said he expected a renewal announcement "imminently".

"We're in negotiations with the state government with regard to a renewal and they are well advanced," he said.

"We're confident we'll have an agreement in place for the race to continue. I'm optimistic there will be a positive announcement very soon."

Howard expected it to be another "multiple-year" agreement, indicating that three years was the optimum length for all parties, primarily so that Motorsport Tasmania could maintain standards and facilities at the venue to satisfy safety requirements for world governing body FIA.

Launceston-born Howard said he was proud of his home state's inclusion on the Supercar calendar.

"Symmons is presenting really well. It's the best I've seen it prepared since I've been coming here.

"It's a well-oiled machine down here, a well-honed operation. The drivers and teams enjoy coming here, the circuit is unique and there is a very passionate and loyal fan base.

"Tasmania has supported us very well and we're looking to support Tasmania. This gives us a national footprint which is great for our fan base.

"It works well for the championship to be able to cover every state. We value that and think the fans do too.

"Governments invest in sport for economic reasons. Every government has to have a return on investment and the Supercars produce a very strong economic benefit and that's why we do run in every state which in turn drives tourism and visitation."