Servus Credit Union customers once again have their debit, ATM, and point-of-sale services after a five-hour outage on Sunday.

The company says a power outage affecting its service provider was behind the issue, which lasted 10 a.m. to 3 p.m.

"Basically the whole thing kind of took us by surprise, and it took them a while to get back online," said Michael Dickinson, a Servus spokesperson.

Dickinson said it was unknown how many customers were afffected, said the company would be putting measures in place to prevent, or at least minimize the impact, of anything similar happening again.

"I would like to apologize to all of our customers who were affected. There were probably a number who were inconvenienced and frustrated by this," Dickinson told CTV News Edmonton.

"We are sorry. We will try to do better."

Servus first announced the affected service at 11:39 a.m. on Sunday.

At that time, its MasterCard services were also being affected, but later said those issues were resolved.