The chairman of the Commission for Energy Regulation is to leave his post to become chief executive of British energy regulator Ofgem.

Dermot Nolan, who has been head of CER since May 2011 having been a commissioner there since 2008, will take up his new role in March.

Mr Nolan replaces Alistair Buchanan, who stood down from the position in June.

The role of chief executive had been temporarily filled by Andrew Wright while the regulator sought a permanent replacement.

In a statement, Ofgem chairman David Gray said he was "delighted to announce this appointment following an open competition which saw a strong field of candidates."

He said that Mr Nolan joined the organisation at a "challenging time" for the industry, but his "economic background and wide experience of regulation and competition matters" would equip him to deal with those challenges.

Mr Nolan trained as an economist, having completed his Masters and Doctorate degrees at Yale University.

He previously worked at the Irish Competition Authority before joining the Commission for Energy Regulation.