The phrase "announced at the beginning" is correct and usable in written English.
It can be used when referring to something that was stated or declared at the start of an event, document, or presentation.
Example: "The new policy changes were announced at the beginning of the meeting to ensure everyone was informed."
Alternatives: "stated at the outset" or "declared at the start".
The winner will be announced at the beginning of November.
"The leadership election should take place in September with the result announced at the beginning of our party conference.
Gruner & Jahr announced at the beginning of this month that it was suing Ms. O'Donnell for breach of contract.
She announced at the beginning of this year that she was stepping down from political life to "achieve a better balance of work and family life".
Voting closes on the 10 June 2016 and the winner from each category will be announced at the beginning of July.
Facing a similar prospect within his cabinet, he announced at the beginning of the session on Sunday that there would be no voting on the Gaza proposal.
Mixing and merging pop energies and the free-associating dreams and actions of surrealism, Bowie announced at the beginning of the early 1970s that the future was now.
Only 300 visitors came all of last year, and so the state announced at the beginning of the summer that the house would close come Labor Day.
In the mainly Protestant port of Larne, he cheerfully weds same-sex couples and divorcees.He announced at the beginning of the year that he was about to marry his own partner, a Filipino chef.
"History always moves west," Mrs. Khemlani said, because that was one of the truisms she announced at the beginning of the semester, and she liked to point out how right she was about things at some point in every lesson.
About 1,000 of the new plans this season were sold after the end of the lockout was announced at the beginning of January, suggesting fans quickly forgave the team and players.
