Former Tema Oil Refinery boss Berko convicted in US for $1m bribery scheme

A federal jury in Brooklyn, New York, has found Ghanaian American businessman Asante Kwaku Berko guilty of orchestrating a bribery scheme worth over $1 million, marking a significant win for cross-border corruption prosecutions involving Ghanaian officials.

According to the Office of the Special Prosecutor (OSP), Berko was convicted on August 6, 2026, of conspiring to pay and paying bribes to numerous Ghanaian government officials between 2014 and 2015. The illicit payments were connected to the development and financing of a power generation facility in Ghana under an agreement between the Ghanaian government and Aksa Enerji Uretim A.S., a Turkish energy company that was a client of the multinational investment bank Goldman Sachs.

Who is Asante Kwaku Berko?

Berko holds dual citizenship of Ghana and the United States, giving him significant business connections across both countries. His professional background includes serving as Managing Director of the Tema Oil Refinery, Ghana's largest petroleum processing facility, a position that would have provided him access to high-level government networks. He also previously worked as an Executive Director in the Investment Banking Division of Goldman Sachs, one of the world's most influential financial institutions, which deepened his involvement in major infrastructure and energy deals across Africa.

The combination of his roles at both a state-owned Ghanaian enterprise and a global investment bank positioned him at the intersection of public and private interests, circumstances that prosecutors argued he exploited to facilitate corrupt transactions.

Why it matters for Ghana

This conviction represents a crucial development in Ghana's fight against high-level corruption, particularly schemes involving international actors and foreign companies. The case demonstrates that Ghanaian officials involved in bribery schemes cannot escape accountability simply by having foreign partners or by operating across borders. The OSP's active collaboration with the Federal Bureau of Investigation (FBI) through Ghana's mutual legal assistance framework proved essential to building the prosecution's case, showcasing how international cooperation can penetrate even complex transnational corruption networks.

The Department of Justice in the United States publicly acknowledged the OSP's contribution as "significant" to securing the conviction, elevating Ghana's profile in international anti-corruption efforts. This recognition may encourage further cooperation between Ghanaian law enforcement and foreign partners, potentially opening doors for investigating other corruption cases that span multiple jurisdictions.

Additionally, the case highlights vulnerabilities in how large infrastructure projects—particularly in the energy sector—can become vehicles for graft. Power plant development deals, which typically involve substantial sums and complex financing arrangements, have historically been susceptible to corruption in many African countries. The spotlight on this case may prompt heightened scrutiny of similar transactions going forward.

What happens next

Berko now faces a maximum prison sentence of 30 years. His sentencing hearing is scheduled for November 10, 2026, where the federal judge will determine the actual length of imprisonment based on sentencing guidelines, his background, and arguments from both the prosecution and defence.

The OSP has emphasised that this prosecution underscores the critical importance of international cooperation in tackling corruption that transcends national boundaries. As Ghana continues to build its institutions and strengthen its reputation as a jurisdiction serious about holding corrupt actors accountable—regardless of their professional standing or international connections—cases like Berko's reinforce the message that no amount of wealth or influence provides immunity from justice.