ed ▁with ▁five ▁natural ▁gas - f ired ▁units . ▁Four ▁of ▁them ▁are ▁ 5 0 - M We ▁gas ▁tur bine ▁( GT ) ▁units , ▁and ▁the ▁fifth ▁is ▁a ▁ 6 8 - M We ▁steam ▁cycle ▁unit . ▁ ▁The ▁entire ▁arrangement ▁is ▁known ▁as ▁combined ▁cycle ▁ 4 - on - 1 ▁where ▁the ▁exhaust ▁from ▁the ▁ 4 ▁GT ' s ▁creates ▁steam ▁via ▁He at ▁Rec overy ▁Ste am ▁Gener ators ▁( H RS G s ) ▁to ▁power ▁a ▁single ▁steam ▁tur bine . ▁In ▁ 2 0 1 4 , ▁the ▁gas ▁fired ▁portion ▁of ▁the ▁plant ▁known ▁as ▁the ▁" Big ▁H ana ford ▁Plant " ▁was ▁removed ▁from ▁the ▁plant ▁foot print ▁and ▁part ed ▁out ▁to ▁various ▁buy ers . ▁ ▁F uel ▁supply ▁Se vent y ▁percent ▁of ▁sub - bit umin ous ▁coal ▁used ▁by ▁the ▁plant ▁was ▁delivered ▁by ▁tr uck ▁from ▁the ▁nearby ▁Central ia ▁Co al ▁Mine , ▁which ▁was ▁a ▁strip ▁mine ▁and ▁the ▁largest ▁coal ▁mine ▁in ▁the ▁state ▁of ▁Washington , ▁until ▁it ▁closed ▁down ▁on ▁November ▁ 2 7 , ▁ 2 0 0 6 . ▁Co al ▁from ▁the ▁Pow der ▁River ▁Bas in ▁in ▁Mont ana ▁and ▁Wy oming ▁has ▁also ▁been ▁transport ed ▁by ▁rail ▁to ▁be ▁burn ed ▁at ▁the ▁plant ▁since ▁ 1 9 8 9 , ▁but ▁was ▁only ▁used ▁to ▁supp lement ▁Central ia ▁Co al ▁mine ▁coal ▁until ▁ 2 0 0 6