The former Laing O'Rourke bid director will join the company as Programme Director.
Devlin has vast experience in leading major infrastructure projects and programmes in both operational and greenfield environments.
He held executive positions at London Underground, Capita, Laing O'Rourke, BAA (Terminal 5) and Bechtel.
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Devlin and his team will be responsible for developing and delivering the Wyfla Newydd power station on Anglesey.
Speaking in his appointment, Devlin said: "I'm delighted to be joining Horizon at this time. The company's development of Wylfa Newydd on Anglesey means it's one of the most exciting projects currently underway in the UK.
"There's been great progress made to date but there are still many challenges ahead and I look forward to using my industry experience to lead the Programme Department in ensuring the successful development of the project."
In addition, HNP appointed Sue Stockton as Human Resources Director.
(LM/CD)
