Abstract: Most trans-region power supply in China is from north to south and west to east, and Tibetan hydropower will play a key role in west-to-east power transmission from the vision of long-term supply. Although the new electricity price reformation puts forward a project to realize marketization of electricity generation and sale, Tibetan hydropower is unsuitable yet for marketization due to its particularity? integrated plants and network, high construction costs, and very long transmission distance. Without an appropriate supporting pricing mechanism, power supply from Tibet to the outside is facing huge challenges. This paper suggests a new pricing method to promote the development of Tibetan hydropower and its trans-region supply, namely the power generation pricing mechanism for trans-region power supply of Tibetan green hydroelectricity considering carbon emission reduction benefits. This method considers the environmental costs and benefits of hydroelectricity and all the advantages and disadvantages of the existing pricing mechanism, thus providing a new idea of power pricing for power transmission from Tibet to the outside.