To leverage the synergies of green electricity and green hydrogen in energy markets and enhance system operational efficiency and renewable energy integration rates

this paper proposes an optimal source-load-storage scheduling method for Regional Integrated Energy Systems (RIES) that incorporates joint trading mechanisms for green electricity and green hydrogen. Firstly

an electricity-heat-hydrogen-gas RIES operational framework is established

referencing carbon trading and green certificate trading mechanisms to develop a green hydrogen certificate trading mechanism and model

thereby forming a green electricity-green hydrogen joint trading framework that synergizes green energy utilization and carbon reduction. Secondly

given the regulatory characteristics of electricity

heat

and gas loads

a comprehensive energy load demand response model is developed

followed by a low-carbon economic dispatch model for RIES integrating joint trading mechanisms for green electricity and green hydrogen. Case studies demonstrate that the proposed method effectively improves the grid integration of green electricity and green hydrogen

enhances renewable energy accommodation

enables efficient resource allocation

and accelerates the low-carbon clean energy transition.