A former banker at Goldman Sachs arranged for millions of dollars in bribes to be paid to government officials in Ghana to help a client win a power-plant contract, US regulators said Monday in a civil lawsuit.

The Securities and Exchange Commission alleges that Asante Berko, a former executive at Goldman’s London subsidiary, facilitated as much as $4.5m in bribes to help a Turkish energy company win a contract to build a power plant. The SEC says the energy company, which wasn’t named, funneled money to an intermediary, which then paid bribes to Ghanaian officials.