OpenAI CEO Sam Altman speaks at the White House in Washington DC on 21 January 2025AARON SCHWARTZ/POOL/EPA-EFE/ShutterstockThis week, OpenAI and other tech companies joined US president Donald Trump at the White House to pledge a private investment of half a trillion dollars in US data centres over the next four years. The Stargate Project could power an ambitious expansion of AI technology with repercussions for the US electricity grid and the countrys energy future.The Stargate announcement comes as North America has been experiencing surging electricity demand in recent years. The grid is already straining to keep