The companies are teaming up with London-based data center business Nscale Global Holdings on the project, the report said, citing people with knowledge of the matter.
Nvidia declined to comment. OpenAI, NScale Global, the White House and Downing Street did not respond to Reuters requests for comment outside regular working hours.
The investment underscores rising demand for digital infrastructure, driven by artificial intelligence and cloud computing.
OpenAI CEO Sam Altman and Nvidia’s chief Jensen Huang are among a group of US tech executives expected to visit the country as part of the delegation, as per the report.
Several US-based companies across a range of industries are also expected to announce tens of billions of dollars in UK investments during Trump’s visit, Bloomberg News said.