The winner, who has chosen to remain anonymous, has continued in his day job and is also making plans for his "dream house''.
"Life has changed - you can't deny it. What's different - I give more money to charities now, I help as much as I can without thinking twice. It's a nice feeling.''
With Powerball worth $25 million this weekend, the Christchurch resident had one key piece of advice for potential winners: "Don't spend like a maniac. Just get used to the money slowly before you make big changes''.