EWURA is mandated to review rates and charges either when the application is lodged by the applicant or when the Authority finds it necessary to do so as stipulated in section 17 of the EWURA Act, Cap 414. The procedure for Tariff Application is provided under the Tariff Application Guidelines 2009. Recently, EWURA has approved a Tanzania Petroleum Development Corporation natural gas processing and transportation interim tariff mechanism which is effective from 1st April 2015 and will remain in force for a period of ninety days. Approved orders can be accessed here.