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The Horizon venture, which currently employs around 90 people, was set up in 2009 as part of the drive to meet the UK's carbon reduction goals.
But RWE and E.ON put the business up for sale in March after Germany's move to abandon nuclear power in the wake of Japan's Fukushima disaster.
Doubts have grown about the private sector's commitment to the UK's nuclear programme after a consortium made up of Iberdrola, GDF Suez and SSE also withdrew from the process.
David Cameron has welcomed Hitachi's takeover of Horizon Nuclear Power and the Japanese technology firm's commitment to build four to six new nuclear plants in the UK.
Japanese technology firm Hitachi has confirmed that it intends to pursue plans to build between four and six new nuclear plants in the UK after acquiring Horizon Nuclear Power.
The new plants, which will be in Wylfa on Anglesey and Oldbury in Gloucestershire, are expected to create up to 12,000 new jobs in the construction phase and 2,000 permanent positions thereafter.
The new infrastructure could generate power equivalent to up to 14 million homes over 60 years.
Rolls-Royce has announced that it will support Hitachi in the delivery of the new nuclear reactors.
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Ministers will delightedly make their announcements later. But one question remains - how much subsidy will new nuclear receive?