The four 'mini-prisons' announced by the Ministry of Justice will hold a total of 1,260 prisoners.
Under the plans, the 'houseblocks' will be built at HMPs Parc in Bridgend, Peterborough in Cambridgeshire, The Mount in Hertfordshire and Thameside in London.
Six prisons in England will close, along with sections of three others.
Justice Secretary Chris Grayling says the plans will "bring down the cost" of operating the prison system, with the target of saving £63m annually.
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First Minister Carwyn Jones told ITV News the deal between Tata and the unions
Steel unions say Tata Steel has made a commitment securing the future of jobs and production at Port Talbot and other UK sites.
The head of the Welsh Rugby Union has defended his decision to allow his top coaches to leave the national set-up in favour of Lions tour.