Sustainable International Financial Institutions Act of 2023

This bill directs U.S. representatives at 12 major international financial institutions (like the World Bank and regional development banks) to prioritize clean energy and oppose new fossil fuel projects. It specifically prohibits U.S. support for any fossil fuel activity - including new oil, gas, or coal projects, pipeline expansions, or fossil fuel infrastructure - through loans, grants, or technical assistance. If these institutions fund new fossil fuel capacity, the U.S. will reduce its financial contributions, holding the funds in an escrow account until the institution stops such funding. The policy directly affects countries and entities receiving international financial assistance for fossil fuels, aiming to redirect global finance toward climate goals.