The main purpose of this legislation is to extend tax credits related to biodiesel fuels and biodiesel mixtures. These credits are designed to encourage the production and use of biodiesel, which is a renewable energy source that can help reduce reliance on fossil fuels and lower greenhouse gas emissions. Key provisions of the legislation include extending the biodiesel and renewable diesel credits until 2026. This means that businesses and individuals who produce or use biodiesel will continue to receive financial incentives for an additional two years.