In this paper we follow the tradition of applied general equilibrium modelling of the Walrasian static variety to study the empirical viability of a double dividend (green, welfare, and employment) in the Spanish economy. We consider a counterfactual scenario in which an ecotax is levied on the intermediate and final use of energy goods. Under a revenue neutral assumption, we evaluate the real income and employment impact of lowering payroll taxes. To appraise to what extent the model structure and behavioural assumptions may influence the results, we perform simulations under a range of alternative model and policy scenarios. We conclude that a double dividend –better environmental quality, as measured by reduced CO2 emissions, and improved levels of employment– may be an achievable goal of economic policy.This work has been possible thanks to the financial support of the Regidoria de Medi Ambient de l'Ajuntament de Barcelona. Institutional support from research grants SEC2000-0796 and SGR2001-0029 (first author) and SEC2000-0390 and SGR2001-0164 (second author) are also gratefully acknowledged.