The Office of the Special Prosecutor (OSP) has disclosed that the prosecution and conviction of Asante Kwaku Berko, a dual Citizen of Ghana and former Managing Director of the Tema Oil Refinery (TOR), was through the Office’s cooperation with US authorities.
Berko, also a former Executive Director at Goldman Sachs, was extradited from the UK to the US in July 2024 to face charges of bribing Ghanaian officials to secure a power plant deal.
He allegedly paid over US$1 million in bribes to officials between 2014 and 2015, and faces up to 20 years in prison for money laundering and conspiracy and five years for violating the Foreign Corrupt Practices Act if convicted.
In a post on the OSP’s official Facebook page on Monday, August 10, 2026, it said the Office “provided investigation and evidentiary assistance to the Federal Bureau of Investigation (FBI) of the United States through Ghana’s established mutual legal assistance framework.”
It added that the US Department of Justice has acknowledged the OSP’s role in the prosecution in fighting corruption, describing it as a “significant assistance.”
Find below the full statement issued on the OSP’s Facebook page
Conviction of Asante Kwaku Berko: International Cooperation in Action
On 6 August 2026, a federal jury in Brooklyn, New York, convicted Asante Kwaku Berko (a dual citizen of Ghana and the United States and former Managing Director of Tema Oil Refinery and former Executive Director in the Investment Banking Division of the U.S. based Goldman Sachs group) of conspiring to pay and paying more than $1m in bribes between 2014 – 2015 to multiple Ghanaian officials in connection with the development and financing of a power plant in Ghana under a deal between the Republic of Ghana and Aksa Enerji Uretim A.S., a Turkish energy company and Goldman Sachs client.
The Office of the Special Prosecutor (OSP) provided investigation and evidentiary assistance to the Federal Bureau of Investigation (FBI) of the United States through Ghana’s established mutual legal assistance framework.
The involvement of the OSP has been acknowledged by the United States Department of Justice (DoJ) as providing “significant assistance to this prosecution”.
Berko faces a maximum sentence of 30 years in prison. The sentence will be handed down on 10 November 2026. This case highlights the effectiveness of international cooperation in combating cross-border corruption crimes.
The cooperation between the FBI and the OSP on this case occurred behind the scenes, and its public outcome of a successful prosecution is a testament to the importance of mutual legal assistance.
