Port Adelaide ended Brisbane's shot at history and made its own as the Power won its first AFL premiership.

After three quarters of pulsating football, the Power tore the grand final apart with five goals to one in the last term for a historic 40-point win, 17.11 (113) to 10.13 (73).

The win at the MCG, in front of 77,671 fans, foiled Brisbane's bid to become the first team since Collingwood in 1927-30 to win four-straight VFL/AFL premierships.

The Power was formed from the Port Magpies, SA's most famous SA football club, and joined the league in 1997.

Port had won 36 flags in the SANFL, creating a culture where success was demanded.

The win was particularly sweet for Power coach Mark Williams, who was in tears at game's end.

As the final siren sounded, Williams was jubilantly gesturing to the crowd with his tie as though he was trying to hang himself, referring to Port's notorious reputation in the last few years as a finals choker.

A few minutes later he ended his speech as the winning coach with "Allan Scott, you were wrong".

It was a pointed comeback at the club's long-time backer, trucking magnate Scott, who said after yet another finals failure 12 months ago that the Power could never win a flag with Williams as coach.

Williams's deceased father, Fos, is a legendary figure in South Australian football, particularly for his coaching achievements at Port.

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