The coal-fired power structure in China will transform to clean and efficient energy power. Based on the long-range energy alternatives planning system, this article establishes a LEAP-China-Electricity model to simulate different electric power planning policy scenarios that could be enacted from 2010 to 2050. In addition to a baseline scenario, carbon capture and storage and nuclear priority scenarios are designed. CO2 emissions and total costs are compared, and the environmental and economic impacts of different scenarios are further analyzed. The sensitivity analysis and environmental assessment can provide useful planning recommendations for China's future power development.