The necessary green transition in the EU requires substantial additional green public investment (GPI) by member countries throughout this decade and beyond. This briefing paper discusses four approaches for a reform of EU fiscal rules to better accommodate higher (debt-financed) GPI: first, an exemption clause for GPI; second, the implementation of a green golden rule; third, a country-specific benchmark share of government expenditures dedicated to GPI recommended by the European Commission; and fourth, an EU Climate Fund. The paper also discusses these options in relation to the recent Commission proposal from November 2022.