Balonwu was elected as a member of the Anambra State House of Assembly in 2003. He became the deputy speaker in June of the same year. After the impeachment of Eucharia Azodo through an unanimous voice vote, Balonwu, representing Onitsha North I constituency, was elected by 20 members present as the speaker. Keluo Molokwu representing Awka South I constituency was elected as the deputy speaker.