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Hot dry rock energy has the potential to be a solution for both energy shortage and carbon-emission reduction. The novel technical scheme based on the super-long gravity heat pipe system in a single well has aroused great interest in the geothermal research and industry community; however, there is yet very few investigations on its power generation performance. Unlike other hot dry rock energy exploitation technologies, super-long gravity heat pipe produces saturated vapor, which can directly drive a steam turbine to generate electricity in a similar fashion to thermal power plants. This study comprehensively analyzes and compares the performance of the super-long gravity heat pipe system with the traditional single-well downhole heat exchanger system from the perspective of technology and economy. The acquired knowledge gives in-depth information about the super-long gravity heat pipe geothermal …