The 28-year-old Powell, who was in the British and Irish Lions squad that toured South Africa last year, has since been dropped by Wales.
He pleaded guilty to a charge of driving while over the alcohol limit, fined 1,000 pounds ($1,500; €1,100) and ordered to go on a drink-driving rehabilitation course.
Speaking after the judgement Powell said,"I fully accept the decision and sentence of the court today."
"In doing so I am mindful of those whom I have let down by my actions and I again offer a full public apology, especially to my fans who have been so supportive, my family, who have stood by me, and the senior officers, management and coaching staff of both the WRU and Cardiff Blues.
"I would also like to thank the Police officers involved in the incident and the management of the Vale Hotel, Golf and Spa Resort for the sympathetic way that they dealt with the situation.
"I now intend to put this matter behind me and to get on with my Rugby career and the remainder of the Cardiff Blues season. I still have aspirations to play for my country which means so much to me.
"I realise that many young sportsmen and women look up to international rugby players and that some of them may be amused by my antics with a golf buggy. However, they should note my regret and be aware that I do not excuse or condone drink driving in any form."
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