frastr ucture ▁Group ▁is ▁owned ▁by ▁various ▁cons ort ia ▁of ▁Hong ▁Kong - based ▁entities ▁listed ▁on ▁the ▁Hong ▁Kong ▁Stock ▁Exchange . ▁The ▁cons ort ia ▁include ▁C K ▁As set ▁Hold ings ▁Ltd ▁( CK A ), ▁C K ▁In frastr ucture ▁Hold ings ▁Ltd ▁( CK I ), ▁Power ▁As sets ▁Hold ings ▁Ltd ▁( PA H ) ▁and ▁C K ▁H utch ison ▁Hold ings ▁Ltd ▁( CK H ). ▁ ▁Through put ▁ ▁When ▁first ▁constructed , ▁the ▁capacity ▁of ▁the ▁system ▁was ▁ 3 6 0 ▁T J / day . ▁A $ 1 5 0 m ▁enh ancement ▁carried ▁out ▁in ▁ 1 9 9 1 ▁increased ▁the ▁capacity ▁to ▁ 4 5 0 ▁T J / day . ▁The ▁current ▁capacity ▁of ▁the ▁pipeline ▁is ▁approximately ▁ 7 8 5 ▁T J / day . ▁The ▁pipeline ▁is ▁currently ▁under going ▁a ▁series ▁of ▁significant ▁exp ans ions ▁in ▁its ▁capacity ▁which ▁are ▁intended ▁to ▁increase ▁the ▁maximum ▁through put ▁of ▁the ▁pipeline ▁to ▁ 8 9 5 ▁T J / day . ▁The ▁expansion ▁project ▁consists ▁of ▁two ▁types ▁of ▁upgrade . ▁Several ▁of ▁the ▁pipeline ' s ▁compress or ▁stations ▁will ▁be ▁upgrad ed ▁with ▁higher ▁capacity ▁gas ▁tur b ines , ▁thus ▁increasing ▁the ▁actual ▁pressure ▁of ▁the ▁gas ▁inside ▁the ▁line . ▁ ▁In ▁addition , ▁the ▁expansion ▁involves ▁a ▁process ▁of ▁' loop ing ' ▁the ▁pipeline . ▁This ▁is ▁the ▁installation ▁of ▁additional ▁lengths ▁of ▁pipe ▁alongside ,