In a statement to Funke Medien, Rainer emphasized the importance of promoting domestic production of biofuels, including biodiesel and biomethane from biogas plants, to improve climate outcomes and reduce dependency on fossil fuel imports. He argued that energy security must be established locally rather than relying on global markets. Additionally, Rainer opposed Federal Minister of Economics Reiche’s proposal to cease funding for small biogas plants under the Renewable Energy Sources Act, asserting their critical role in rural energy supply. He also highlighted the growing significance of electromobility for agricultural vehicles.