Hawaiian Electric Co.’s unionized employees ratified a new contract today, ending a strike that began one week ago.

The contract covers 1,280 HECO workers on Oahu, the Big Island, Maui, Molokai and Lanai who are members of the International Brotherhood of Electrical Workers Local 1260. The effective date of the contract is Jan 1, 2011 and it is in effect through Oct. 31, 2013.

A recorded message on an answering machine at union headquarters instructs employees to report to work on Monday at their normal starting time unless they are called in before that by a supervisor.

“We look forward to welcoming our union employees back to work, said Dick Rosenblum, HECO president and chief executive officer. “We sincerely appreciate the patience of our customers during this process.

Rosenblum did not give any details on terms of the contract. Lance Miyake, the union’s business manager, did not return calls seeking comment.

The workers went on strike March 4. A tentative agreement was reached on Monday. The ratification vote was held Wednesday, yesterday and today.