Texas Election Code - ELEC § 243.003. Petition

(a) The contestant must state the grounds for the contest in a petition in the same manner as a petition in an election contest in the district court.

(b) The contestant must file the petition with the secretary of state not later than the later of the 10th day after the date the election records are publicly available under Section 1.012 or the official result of the contested election is determined.

(c) The contestant may not file the petition before the day after the date of the contested election.

(d) The petition must state the name and address of the contestant or an agent for the contestant to whom a copy of the contestee's answer is to be delivered.  If there is more than one contestant, the petition must designate one to receive the copy on behalf of all the contestants.