Equitable carbon responsibility distribution is pivotal for the low-carbon transformation of the power system and the realization of dual-carbon goals, fostering fair benefits and balanced development for all entities within the system. Addressing the current practice of a fixed ratio sharing between generation and load sources, which deviates from the principle of “the polluter pays”, this paper proposes a coordinated planning method for generation, storage, and transmission, considering carbon responsibility allocation from a planning perspective. Firstly, a adhering to the fundamental principle of ” who causes, who bears, ” the various stakeholders are classified and held accountable, and the reasonable and fair sharing principle and reward and punishment index are established. Then, on this basis, a two-layer carbon responsibility cost allocation rule for power system power balance and power balance is established. Secondly, a source-storage-network joint planning model considering the investment cost of conventional thermal power installation, energy storage investment cost, wind curtailment penalty cost, transmission line expansion cost and carbon emission responsibility cost is constructed. Finally, the effectiveness of the proposed method is verified by an example of a regional power grid transmission project system in Northeast China, and compared with the source-storage-transmission planning method without considering carbon responsibility allocation, the necessity of considering carbon responsibility allocation is further explained.