The chief executive of South Africa’s struggling power utility Eskom, Phakamani Hadebe, said on Friday he was stepping down for health reasons after leading efforts to stabilise the highly indebted state firm.

Eskom is regularly cited by ratings agencies as one of the main threats to the country’s creditworthiness and economic growth.

“It is no secret that this role comes with unimaginable demands which have unfortunately had a negative impact on my health. In the best interests of Eskom and my family, I have therefore decided to step down,” Hadebe said in a statement.

Hadebe added that he was “humbled and grateful to have contributed towards the stability for an organisation that is critical for our economy.”

He will step down at the end of July this year, the company’s board said. There was no mention of an interim CEO.

The government appointed Hadebe as chief executive in May 2018, ending a string of interim appointments that stretched back to 2016.

Eskom board chairman Jabu Mabuza said Hadebe should be commended for his “dedication and passion”.

Eskom faces generation capacity constraints and South Africa has been plagued by power cuts in the past year, undermining broader efforts to kick-start growth.