Last season's surprise semi-finalists Burton claimed another big scalp in the Carabao Cup as they beat Bournemouth to reach round four in a game stopped three times for floodlight failure.
The Brewers were deserved winners, given to them by fine finishes from Oliver Sarkic and Nathan Broadhead.
Bournemouth made 10 changes and it showed in a limp, ineffectual display.
Their attempt to find momentum was not helped by delays for the failed lights, leading to 28 added minutes.
Referee John Busby even called a halt to proceedings after the third failure, only to be told by the Football League a match can only be called off if there is a total delay of at least 30 minutes.
Play resumed and in the final added minute, the Cherries struck the post through Chris Mepham's header, but Burton were not to be denied their place in the fourth round and another home tie with a Premier League side, this time Leicester.