, ▁Trans Al ta ▁agreed ▁to ▁reduce ▁em issions ▁of ▁nit ro gen ▁ox ide ▁( NO x ) ▁by ▁ 2 0 ▁percent ▁beginning ▁in ▁ 2 0 0 9 . ▁This ▁is ▁two ▁to ▁five ▁years ▁earlier ▁than ▁Trans Al ta ▁would ▁have ▁been ▁required ▁to ▁reduce ▁NO x ▁em issions ▁if ▁an ▁agreement ▁had ▁not ▁been ▁reached ▁with ▁the ▁Department ▁of ▁E col ogy . ▁In ▁ 2 0 1 2 , ▁Select ive ▁Non ▁Catal yt ic ▁Red u ction ▁( SN CR ) ▁system ▁was ▁installed ▁to ▁further ▁reduce ▁NO x ▁at ▁a ▁cost ▁of ▁almost ▁$ 2 0 M . ▁It ▁is ▁in ▁the ▁commission ing ▁and ▁testing ▁phase ▁through ▁ 2 0 1 4 . ▁owner ▁of ▁Central ia ▁plant ▁and ▁Washington ▁State ▁E col ogy . ▁ ▁Cont ract ors ▁for ▁the ▁power ▁plant ▁The ▁design ▁and ▁construction ▁of ▁the ▁new ▁plant ▁were ▁by ▁ ▁Stone ▁& ▁Web ster ▁and ▁ ▁A BB ▁Environment al ▁Systems . ▁ ▁O wn ership ▁From ▁the ▁early ▁ 1 9 7 0 s ▁until ▁ 2 0 0 0 , ▁the ▁plant ▁was ▁owned ▁by ▁eight ▁util ities : ▁Pac ifi Cor p ▁( 4 7 . 5 % ), ▁Av ista ▁Energy ▁( 1 5 % ), ▁Seattle ▁City ▁Light ▁( 8 % ), ▁Sn oh om ish ▁County ▁P UD ▁( 8 % ), ▁Ta com a ▁Power ▁( 8 % ), ▁Pu get ▁Sound ▁Energy ▁( 7 % ), ▁Gray s ▁Har bor ▁County ▁P