Lights in Upolu are back on after residents of the island went without electricity for more than two hours.

The Electric Power Corporation (E.P..C) confirmed this.

"Power has been restored to all affected areas this evening and we thank you Samoa for your understanding as our technical teams work to bring power back on to your residents and businesses," a notice from E.P.C. said.

"We apologize for the inconvenience caused and again acknowledge your patience. Thank you and a peaceful and blessed evening Samoa."

At about 5.30pm, electricity was knocked for the entire island. 

E.P.C. then issued a notice saying they are trying to find the cause.

"E.P.C. wishes to advise that power is currently out to the island of  Upolu and our technical teams are on it to find the cause and restore power as soon as and safely possible," a public notice said. 

"We sincerely apologize for the inconvenience caused Samoa, and kindly request your patience as we work to identify the cause."

It was not possible to obtain an official comment from E.P.C. on what actually caused the blackout.