JAKARTA (BLOOMBERG) - Jakarta prosecutors have named Dahlan Iskan, Indonesia's former minister for state-owned enterprises, as a suspect in a corruption case related to the procurement of power transformers.

Mr Iskan, president director of state electricity utility PT Perusahaan Listrik Negara from 2009 to 2011, was questioned Thursday and Friday, Mr Waluyo, a spokesman for the prosecutor's office, said in a phone interview on Saturday.

The case relates to alleged wrongdoing in the purchase of equipment for a 1.06 trillion rupiah (US$80 million) power substation project in 2011, when Iskan headed the utility, Waluyo said. Three calls to Iskan's mobile phone went unanswered.

Before he was picked to run the state-owned power company by the administration of former President Susilo Bambang Yudhoyono, Mr Iskan was chief executive of newspaper publisher Jawa Pos Group. A member of Yudhoyono's Democratic Party, Iskan won an internal contest to run as the party's presidential candidate in 2014. The party fell short of the threshold needed in parliamentary elections to field a candidate.

Mr Iskan is the latest in a string of Indonesian politicians who have been convicted or investigated for corruption. Former Energy Minister Jero Wacik is currently the subject of a graft probe, while Andi Mallarangeng, a one-time sports minister, was sentenced to four years in jail last year. Indonesia ranked 107th on a list of countries in Transparency International's Corruption Perceptions Index for 2014.

Mr Iskan has not been arrested but the prosecutor's office will question him again on Thursday, said Mr Waluyo, who like many Indonesians goes by one name.