OpenAI and SoftBank Group will jointly invest $1 billion in SB Energy, committing $500 million each to accelerate the expansion of data center and power infrastructure for their Stargate initiative, SB Energy said on Friday.
SB Energy, which is owned by SoftBank, will build and operate OpenAI’s previously announced 1.2-gigawatt data center campus in Milam County, Texas. The facility is a key component of Stargate, a massive, multi-year plan to scale artificial intelligence training and inference capacity in the United States.
As part of the partnership, SB Energy will also become a customer of OpenAI, using its application programming interfaces and deploying ChatGPT internally for employees.
Stargate is a $500 billion initiative backed by major investors including Oracle, and was publicly endorsed by Donald Trump when the plan was unveiled in January 2025. The project reflects the scale at which leading AI developers are now operating as they race to secure computing power.
The deal highlights a broader industry shift in which technology companies are investing directly in energy and power infrastructure. Access to reliable electricity has become a critical bottleneck for AI expansion, as larger and more numerous data centers sharply increase power demand.
SB Energy said it is developing several data center campuses, with initial facilities expected to begin service later this year. “The partnership accelerates our delivery of advanced AI data center campuses and associated energy infrastructure at the scale required to advance Stargate and secure America’s AI future,” said SB Energy co-CEO Rich Hossfeld.
The data center construction boom has also driven rivals to commit unprecedented sums to infrastructure. Meta Platforms and other Big Tech firms have announced multi-billion-dollar investments spanning chips, cooling systems, servers and power generation.
At the same time, OpenAI is facing rapidly rising costs to train and operate its AI models amid intensifying competition from Alphabet’s Google. OpenAI CEO Sam Altman told employees late last year that the company had entered a “code red” phase, prioritising improvements to ChatGPT while delaying other product launches to counter Google’s Gemini gaining traction.