Abstract: As the oil industry accelerates its transition from traditional fossil fuels to renewable energy, green electricity supply, represented by wind and solar power, has emerged as a crucial avenue for promoting clean and low-carbon development in the oil and gas exploration sector. Utilizing green steam generated from green electricity in the extraction of underground heavy oil not only aids in the consumption of green electricity but also directly conserves substantial natural gas resources, offering numerous advantages such as energy saving and emission reduction. However, the volatility and intermittency of green electricity output highlight the mismatch between clean energy supply and the thermal energy demand for oil reservoir development in terms of time, space, and intensity, posing new challenges to the deep integration of green electricity and heavy oil development. To address this, we expand the concept of steam chamber in heavy oil thermal recovery development, combine it with the idea of energy storage systems in the new energy field, and propose "steam chamber thermal storage". We further elucidate its basic principles, scientific connotation, and heat storage and release mechanism. Based on this, we explore the application scenarios of steam chamber thermal storage and discuss the opportunities and challenges for its future development. The study suggests that steam chamber thermal storage possesses characteristics of economic reliability, strong heat storage capacity, and the ability for spontaneous expansion of heat storage performance. The heat storage and release mechanism primarily involves thermal energy rebalancing under pressure changes, thermal energy conversion under phase changes, and thermal energy slow release caused by pressure difference changes. The scientific application of the steam chamber thermal storage concept can provide a new path for clean alternatives in heavy oil thermal recovery, support the establishment of a new model for significant energy saving and emission reduction in heavy oil thermal recovery, and facilitate the formation of new productive forces in heavy oil development under the dual carbon goals. This concept holds significant engineering value and practical significance.