BRASILIA, June 16 (Reuters) - A bill allowing the privatization of state-owned energy giant Eletrobras will be put to the vote on Thursday starting at 10 a.m., the head of Brazil's Senate Rodrigo Pacheco said on Monday.

The bill has passed the lower chamber but has been changed in the Senate in its present form, which means it would have to return to the house and could run out of time.

The bill is a temporary decree issued by the government and must be approved in Congress by June 22 or it will expire.

(Reporting by Maria Carolina Marcello Editing by Chris Reese)