Mighty River Power said one of is directors, Jon Hartley, would step down from the board because of delays to the state-owned enterprise's initial public offer.
Hartley, who has been a director since November 2009, said the decision to step down was a difficult one, brought about by the revised timing of the initial public offer (IPO) creating workload clashes with his other commitments. His resignation is effective from February 20.
"Unfortunately, I have commitments to a number of self-funded overseas engagements with World Vision International and its micro finance subsidiary, VisionFund International, of which I am vice chair," Hartley said in a statement.
Hartley has been involved with VisionFund International since 2003. Mighty River's chairwoman Joan Withers said the board accepted Hartley 's resignation "with regret".
Late last year, Prime Minister John Key said the IPO and listing of Mighty River would be delayed until the second quarter of this year to give the Government more time to consult with iwi over the "shares-plus" concept.