<prompt> Translate the following text to EnglishMwaka 1999, Gavana Bush alisaini sheria ambayo inaweka kikomo cha kudumu cha uzalishaji wa NOx na SO2 kutoka kwa mitambo ya zamani ya umeme huko Texas kuanzia mwaka 2003 na inahitaji huduma za umeme kuanzisha kiasi fulani cha uwezo wa nishati mbadala na safi ifikapo mwaka 2009.  <response>: In 1999, then-Governor Bush signed legislation that permanently caps NOx and SO2 emissions from older power plants in Texas starting in 2003 and requires utilities to install a certain quantity of renewable and clean energy capacity by 2009. 