The French government has implemented a tariff shield on energy products to dampen the impact of the increase in energy prices started in 2021. To assess the macroeconomic and redistributive effects of this policies, we propose a new methodology for ex-ante evaluations, based on the government forecasts embedded in the Finance Act and on a new-Keynesian business cycle model with heterogeneous agents. From a macroeconomic perspective, this policy supports economic growth and curbs inflation, but slightly rises the debt-to-GDP ratio. In terms of redistribution, this policy contains the rise in consumption inequalities. We compare the effects of this policy with alternative policies such as a re-indexation of wages on prices or a redistributive policy targeted at the most vulnerable households.