Beijing　has　experienced　rapid　economic　development　since　the　reforms　and　opening　up.　However,　the　traditional　development　model　based　on　excessive　energy　consumption　has　posed　great　challenges　to　the　ecological　environment.　To　curb　environmental　degradation　and　achieve　sustainable　social　development,　Beijing　has　proposed　to　achieve　carbon　neutrality　by　2050.　As　an　important　indicator　of　energy　consumption,　it　is　necessary　to　clarify　how　energy　intensity　(EI)　affects　carbon　emissions　(CE)　to　achieve　carbon　neutrality　in　Beijing　by　2050.　This　study　first　decomposes　the　drivers　of　CE　in　Beijing　from　2010　to　2020　using　the　logarithmic　mean　Divisia　index　(LMDI)　method　and　comparatively　analyses　the　impact　of　EI　on　CE.　Then,　the　spatial　Dubin　model　(SDM)　is　used　to　analyse　the　spatial　spillover　effect　of　EI　on　CE　at　the　regional　level.　Finally,　the　macro　moderating　role　of　economic　development　in　the　effect　of　EI　on　CE　is　analysed.　The　results　show　that　the　effect　of　EI　has　been　the　main　driver　of　CE　reduction　in　Beijing.　Among　the　industrial　sectors,　manufacturing　and　transportation　have　had　the　greatest　success　in　reducing　CE　through　EI　reduction.　At　the　regional　level,　there　is　a　spatial　spillover　effect　of　EI　on　CE,　and　the　effect　of　carbon　reduction　through　the　spillover　effect　of　EI　is　greater　than　the　direct　effect　of　EI.　Economic　factors　have　an　enhanced　moderating　effect　on　the　process　of　EI　affecting　CE,　and　this　moderating　effect　has　threshold　properties.