The Stormers beat the Waratahs 25-6 to set up an all South African final against the Bulls at Orlando Stadium in Soweto next week.
The Stormers will be playing in their first ever Super Rugby final next week.
The Bulls who beat the Crusaders earlier in the first Semi-final were forced to give up their home ground at Loftus Versfeld as it is being used by FIFA for the upcoming football world cup.
The Waratahs had the bulk of possession and looked dangerous at times but the Stormers scored the only try of the match and again their defence held the Waratahs out.
Stormers try scorer Juan De Jongh was awarded man of the match.
The Waratahs constantly found themselves on the wrong side of the South African referee Mark Lawrence particularly in the second half when Stormers fly half Peter Grant kicked four of his six penalties.
When the two teams met in the round-robin phase of the Super 14 the Stormers won 27-6.
The match was the first time that the Stormers have won a Super rugby play-off encounter after their failed attempts in 1999 and 2004.
The 2010 Super 14 will be an all South African affair and the last time South Africa supplied both Super 14 finalists was in 2007 when the Bulls beat the Sharks 20-19 to lift the trophy in Durban.
The star for the Stormers was flyhalf Peter Grant who contributed 20 points with the boot.
Straight from their shallow kick-off the visiting Waratahs from Australia grabbed the initiative with a wave of enterprising attacks sprung around the Stormers' 22-metre area.
The hosts saw off this early six-minute test of their much-vaunted defence and a break-out from deep inside their own half transferred play to 15 metres from the Waratahs' tryline.
In the space of two minutes Stormers flyhalf Peter Grant punished the Waratahs' mistakes when he was on target with penalty attempts to secure a 6-0 lead after 11 minutes.
Grant's opposite number, Berrick Barnes, was not as accurate and after his third-minute miss he found his range in the 15th and 24th minutes with a penalty and a drop goal to restore the stalemate (6-6).
Prior to Barnes' drop goal the Stormers showed signs of striking early cohesion as they kept ball in hand on a few upfield surges which looked promising, although not really threatening.
However, in the 26th minute the Stormers were on attack but their central defence sprung a leak and Stormers centre Juan de Jongh ran in from 15m out to dot down next to the posts for the only try of the match.
On his way to the tryline, De Jongh sidestepped deftly to leave at least four would-be tacklers floundering in his slipstream. Grant added the conversion to make it 13-6 which was the half time score.
In the last quarter of the first half the Waratahs enjoyed a slight territorial advantage but the Stormers always looked the more likelier to score.
However, neither side were able to add to their tally as the first half ended on a somewhat tame note.
After the break both teams ran hard with ball in hand and the 47 896-strong crowd lapped up the entertaining fare, with the Stormers looking the stronger side.
Neither team could convert their early good fortune to points but 11 minutes after the restart Grant kicked a successful penalty attempt, followed by another five minutes later to stretch the Stormers' lead to 13 points after 56 minutes of play.
This cushion allowed the hosts to consolidate as the Waratahs tried to apply pressure with flowing crossfield movements which hardly proved penetrative.
Much against the run of play at that stage, a Stormers sortie into the Waratahs' half yielded a 63rd minute penalty, and another two minutes later Grant mercilessly landed another with aplomb to give his side a commanding 25-6 lead.
In the final 10 minutes both the Waratahs, and to a lessor extent the Stormers, had guilt-edged chances to breach the opposition defences but the steady stream of errors that had crept into the game ensured the 25-6 scoreline remained in tact until referee Mark Lawrence sounded the final whistle.
Final Score Stormers 25 Waratahs 6
Scorers
Stormers
Tries - J.De Jongh
Pen - P Grant 6
Con - P Grant
Drop -
Cards -
Waratahs
Tries -
Pen - B Barnes
Con -
Drop - B Barnes
Cards -
Man of the match - Juan De Jongh
Match Officials.
Referee: Mark Lawrence (ZA)
Assistant referees: Marius Jonker (ZA), Cobus Wessels (ZA)
Assessor: Shaun Veldsman (ZA)
Timekeeper: Paul Ackermann (ZA)
Teams
Stormers
15. Joe Pietersen,14. Gio Aplon,13. Jaque Fourie,12. Juan De Jongh,11. Bryan Habana,10. Peter Grant ,9. Dewaldt Duvenage,8. Duane Vermeulen,7 Francois Louw,6. Schalk Burger (C),5. Andries Bekker ,4. Adriaan Fondse,3. Brok Harris,2. Tiaan Liebenberg ,1. Wicus Blaauw
Reserves:16. Deon Fourie,17. Eusebio Guinazu,18. Anton Van Zyl,19. Pieter Louw,20. Ricky Januarie,21. Willem De Waal,22. Tim Whitehead
Waratahs
15. Kurtley Beale , 14. Lachie Turner , 13. Rob Horne , 12. Tom Carter , 11. Drew Mitchell , 10. Berrick Barnes , 9. Luke Burgess , 8. Ben Mowen , 7. Phil Waugh [c] , 6. Patrick McCutcheon , 5. Kane Douglas , 4. Dean Mumm , 3. Al Baxter , 2. Tatafu Polota-Nau , 1. Dan Palmer
Reserves 16. Damien Fitzpatrick 17. Jeremy Tilse , 18. Chris Thomson , 19. Dave Dennis , 20. Josh Holmes , 21. Daniel Halangahu , 22. Rory Sidey
