Private prisons are a stain on humanity. Prison operators explicitly profit from human misery, then lobby for longer prisons terms so they can keep on profiting. And in the US, prison companies run not only local and state prisons, but also Donald Trump's immigration concentration camps. Faced with this moral outrage, California - once one of the heaviest users of private prisons - has banned them from operating within the state:
The private prison industry is set to be upended after California lawmakers passed a bill on Wednesday banning the facilities from operating in the state. The move will probably also close down four large immigration detention facilities that can hold up to 4,500 people at a time.
The legislation is being hailed as a major victory for criminal justice reform because it removes the profit motive from incarceration. It also marks a dramatic departure from California’s past, when private prisons were relied on to reduce crowding in state-run facilities.
Existing prisons get to keep running until their contracts expire, and then they will have to shut down. For state contractors, that means prisoners will be transferred back to state prisons. As for ICE, presumably they'll have to start running proper federal facilities again, rather than contracting them out to the lowest bidder.
(As for NZ, thanks to National we will have a private prison running in South Auckland until 2040, unless Parliament legislates to void their contract. The sooner that happens, the better).
