This internship report summarizes the author's 6-week internship at the Finance Department of Sui Southern Gas Company (SSGC). SSGC is a natural gas utility that aims to reliably supply natural gas to meet customer demand through sustainable and environmentally friendly practices. The report provides an overview of SSGC's organizational structure, vision, mission and objectives. It also describes the key responsibilities and processes within the Finance Department, including general ledger management, fixed asset accounting, inventory accounting, and budget planning. In conclusion, the author gained valuable experience in corporate finance and recommends that SSGC continue expanding access to natural gas across regions.