Lowang, 52, who was elected from Namsang assembly constituency, filed his nomination as the ruling Congress in the office chamber of Deputy Speaker Tenzing Norbu Thongdok.
Thongdok is likely to be elevated to the rank of a cabinet minister.
Governor J.P. Rajkhowa summoned the assembly session on February 25 and 27 after rebel Congress legislator Kalikho Pul was sworn in as chief minister on February 19 after the central government recommended that President's Rule be lifted from the state.
Pul will try to prove his majority in the assembly on Thursday after Governor Rajkhowa's address to the members of the house and the election of the new assembly speaker.
The speaker's election was necessitated after 21 legislators led by Pul impeached the then speaker Nabam Rebia during a assembly session at a makeshift venue here and elected Pul as the new leader of the house.
Rajkhowa advanced the sixth session of the assembly from January 14 to December 16 and 17 last year after the rebel Congress legislators openly revolted against the then chief minister Nabam Tuki.