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The deal, along with another to run Belmarsh West prison in London, will be worth £600m to Serco over 26 years. The contracts are due to be signed early next year.
The Maghull prison will be built close to Ashworth Hospital and will be next door to 350-place HMP Kennet which opened in 2008.
Construction work by Skanska is expected to begin in the first half of next year and completed by the end of 2011.
Serco chief executive Christopher Hyman said: “We are committed to providing safe, secure and cost-effective regimes and offender accommodation that reduce reoffending and which support offenders in leading more fulfilling lives once they have been released.
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In the UK, Serco already manages four adult prisons, a Young Offenders Institution, and a Secure Training Centre for young people, as well as providing electronic monitoring and court escort services.

See the full article from “Maghull & Aintree Star”