The Thunder 14.11 (95) defeated the Apple Isle 9.5 (59).
Having gone through last year's carnival winless, Northern Territory bounced back from a 28-point loss to Queensland last Saturday to achieve a fine win.
Northern Territorian Cyril Rioli, nephew of Norm Smith Medallists Maurice Rioli and Michael Long, was outstanding again. He won 23 touches and was arguably best-on-ground.
Tom Oliver also shone with 32 possessions - the most for the match - while he laid eight tackles. Teammate Josh Cubillo was the next leading ball-winner with 26 touches.
The Thunder had three players kick three goals each - Jethro Calma-Holt, Nathan Djerrkura and Patrick Fittock - and all three were crucial players in the win.
Highly-rated Tasmanian Mitchell Thorp was clearly his side's best player. He finished with 27 disposals (17 kicks and 10 handballs) and 10 marks. Tom Hislop also gained 20 touches and was prominent for his state.
In a low-scoring first term, Calma-Holt kicked off proceedings for the Territory, which proved to be the Thunder's only major during that period. But Tassie could only muster two majors, although it took a six-point advantage into the first break.
The Apple Isle opened the second quarter with two in a row, jumping out to a 16-point lead, but it soon proved to be the Territory's term.
The Thunder slammed on five unanswered goals - including two each from Bradley Campbell and Fittock - to gain a 16-point lead at half-time.
Northern Territory broke away to a 28-point lead early in the second half, when Djerrkura booted a couple and Fittock added his third. By three quarter-time, Tasmania trailed by 22 points.
Calma-Holt booted his third to kick-start the final term and when Stewart Rioli kicked truly at the 16-minute mark, the Thunder was out to a 41-point lead with victory clearly assured.
TASMANIA: 2.2 4.4 7.4 9.5 (59)
NORTHERN TERRITORY: 1.2 6.8 10.8 14.11 (95)
GOALS - Tasmania: Garland 2, Riewoldt 2, Wells 2, Bellchambers, Higgs, Thorp
Northern Territory: Calma-Holt 3, Djerrkura 3, Fittock 3, Campbell 2, Oliver, C.Rioli, S.Rioli
BEST - Tasmania: Thorp, Hislop, Joseph, Collier, Garland, Wells,
Northern Territory: C.Rioli, Oliver, Djerkurra, Fittock, Calma-Holt, Cubillo
VENUE: Skilled Stadium, Geelong
