省人大 is short for
省人民代表大会 (Provincial People's Congress), the provincial-level legislature. It passes local laws (
地方性法规), oversees the provincial government and courts, and elects the governor. The chain mirrors the national structure:
全国人大 →
省人大 →
市人大 →
县人大. Convenes annually; a standing committee
省人大常委会 handles business between sessions.