Sustainable Energy Fund (SEF) is a 501(c)(3) nonprofit located in the Lehigh Valley that helps energy users in Eastern and Central Pennsylvania overcome financial, educational, and regulatory barriers to a sustainable energy future. SEF does this by providing and/or facilitating commercial loans and stipulated energy savings agreements, investing in companies working towards a sustainable future, and by hosting one of the premier sustainable energy conferences in the Mid-Atlantic region, Energypath.