<prompt> Translate the following text to EnglishKwa viwango vya kiwango cha kiwango cha hivi karibuni, kuondoa makundi ya upendeleo ingetoa karibu theluthi moja ya dola bilioni katika mapato ya ziada.  <response>: Under the rate levels of the most recently completed rate case, eliminating the preferred categories would yield about onethird of a billion dollars in additional revenue. 