ition ▁Bill , ▁will ▁result ▁in ▁one ▁bo iler ▁being ▁shut ▁down ▁by ▁the ▁end ▁of ▁ 2 0 2 0 ▁and ▁the ▁other ▁by ▁the ▁end ▁of ▁ 2 0 2 5 . ▁ ▁Gener ating ▁units ▁ ▁Co al - f ired ▁The ▁two ▁identical ▁coal - f ired ▁generating ▁units ▁have ▁a ▁combined ▁capacity ▁of ▁ 1 , 3 4 0 ▁M W . ▁Both ▁units ▁started ▁up ▁for ▁commercial ▁operation ▁in ▁August ▁ 1 9 7 1 . ▁( B onne ville ▁Power ▁Administration ▁ 1 9 8 0 ▁E IS ) ▁ ▁In ▁ 2 0 1 1 , ▁a ▁deal ▁was ▁struck ▁between ▁the ▁plant ▁owner ▁and ▁operator , ▁Trans Al ta , ▁Governor ▁Christ ine ▁Gre go ire , ▁and ▁Washington ▁State ▁environmental ▁groups ▁and ▁policy ▁mak ers ▁to ▁shut ▁down ▁the ▁coal ▁bo ilers . ▁ ▁The ▁first ▁would ▁be ▁shut ▁down ▁in ▁ 2 0 2 0 , ▁and ▁the ▁second ▁in ▁ 2 0 2 5 , ▁with ▁a ▁schedule ▁of ▁em issions ▁redu ctions ▁to ▁be ▁met ▁along ▁the ▁way . ▁ ▁The ▁Washington ▁State ▁Senate ▁approved ▁the ▁deal ▁with ▁a ▁ 3 6 - 1 3 ▁vote . ▁To ▁complete ▁this ▁transition , ▁Trans Al ta ▁is ▁receiving ▁an ▁exped ited ▁permit , ▁and ▁is ▁also ▁ex empt ▁from ▁any ▁Environment al ▁Imp act ▁Ass ess ment ▁that ▁would ▁otherwise ▁be ▁required . ▁ ▁Gas - f ired ▁In ▁ 2 0 0 2 , ▁the ▁plant ▁capacity ▁was ▁supp lement