New electricity generating capacity would enable north-east to attract investment for large-scale AI infrastructureNational Grid has taken a step towards building Britain’s biggest electricity substation on Teesside, which could supply power to a vast neighbouring datacentre as the UK races to expand its AI infrastructure.Last week, the company agreed to purchase 29.5 hectares (73 acres) of land at Dorman Point on a site owned by Teesworks, a local private-public partnership.