Eighteen coal-fired power plants in Chungcheongnam-do, representing 9 GW of capacity, are scheduled for decommissioning by 2038, with the majority transitioning to gas-fired power generation and only a fraction remaining in the region. This transition raises significant concerns regarding regional job security and greenhouse gas emissions. Given the region's substantial renewable energy potential, including solar photovoltaic (PV) and wind, this study quantitatively analyzes the national and regional socio-economic impacts, focusing on employment and value-added creation from expanding renewable energy and gas-fired power generation up to 2050. The analysis covers five scenarios, incorporating the intrinsic characteristics of the renewable energy system, such as local capacity and flexibility options, within the context of Chungcheongnam-do, South Korea.