The purpose of this legislation, known as the CLEAN Act, is to update and improve the Geothermal Steam Act of 1970. The main objectives are to increase the frequency of geothermal lease sales, ensure that replacement sales occur if any are canceled, and streamline the process for obtaining geothermal drilling permits. Key provisions of the CLEAN Act include several important changes. First, it mandates that geothermal lease sales occur annually instead of every two years.