The greenhouse gas emissions to the atmosphere are an economic and environmental problem. In this work we make a detailed study of the emissions from the branches of the Spanish energy sector. To this end, we have developed for the Spanish economy a Social Accounting Matrix (SAM) with Environmental Accounts, considering the six greenhouse gases that the Kyoto Protocol states. In this SAM, the energy sector appears disaggregated in eight sectors, including renewable branches, in order to distinguish the emissions of each type of energy. The analysis is performed using a linear multisector model applied to the SAM, which allows us to obtain the emissions, both direct and indirect, caused by each branch of the Spanish energy sector. Finally, we evaluate the impact in emissions caused by a shift in the household energy consumption towards renewable energy.