The 24-year-old seamer replaces Jacob Duffy in the side, while spinner Mark Craig returns from illness and takes all-rounder Christi Viljoen's spot in the 12.
Bacon was desperately unlucky to be left out of the squad for the disappointing eight-wicket loss to Canterbury at the University Oval in the weekend.
He made his debut for Otago during the second half of the twenty20 competition and ended up as Otago's leading wicket-taker with nine wickets at an average of 12.22. His economy rate of 7.33 was a vast improvement on some of the more senior bowlers who had been playing ahead of him.
But Bacon, who has spent a lot of time carrying the drinks this summer, has had to wait patiently for opportunities.
He gets a chance at Duffy's expense. Duffy struggled with his line and length and his four overs proved costly, the right-armer going for 34 runs at 8.5 an over.
Volts coach Rob Walter said he felt Bacon would be more effective at the Basin with his ability to hit the deck harder and bowl back of a length.
''Jacob didn't go as well as we would have hoped in the game and that happens,'' he said.
''But Matt has also come off the T20s with a reasonable amount of form and backed it up in club cricket as well.''
He took four for 64 for Albion at the weekend and ''is running with a bit of form right now, so we want to give him an opportunity''.
Craig would probably have played ahead of Viljoen had he not been ill. With Anaru Kitchen on Black Caps duty and Rob Nicol carrying a hand injury (split webbing), which will probably prevent him bowling, Otago felt it needed a second spinner.
Whether they both make the playing XI will depend on how the pitch shapes up.
One of the positives to emerge from the loss to Canterbury was the form of former Black Cap Jimmy Neesham.
He swatted 69 from 67 balls and took one for 17 from five overs. It was a pleasing return to form for Neesham.
He was dropped from the T20 side last month and took two weeks away from the game to refresh.
''It was an impressive day for him actually.
''Obviously we would have love for him to kick on [with the bat] ... but it was an ideal comeback. He batted well and bowled well, so that was great to see,'' Walter said.
Otago is in third place with two wins from four games and is well-placed to press for a spot in the playoffs.
Wellington is in fifth-place with one win from four games and has made just one change to the team which lost to Northern Districts by four-wickets. Fraser Colson replaces Matt Taylor in the middle order.
Walter will skip today's game and remain in Dunedin with wife Heather and newborn son. Michael was born on Saturday and has a 21-month-old brother called William.
Volts assistant coach Anton Roux will fill in during Walter's short absence.
