Era4

Era4 is the deployment-infrastructure partner in Cosine's Lumen Sovereign Coalition, the thirteen-company group behind what Cosine calls Britain's first sovereign frontier AI model, unveiled at London Tech Week on 8 June 2026. Era4 converts brownfield and former energy sites into a distributed network of compute facilities, each powered from its own renewable generation, a model it frames as a private "National Grid for AI".

The company was incorporated in 2025 and rebranded twice in quick succession, from Neoghost to Carbon3AI and then to Era4 in March 2026. It is headquartered in Shoreditch, east London, and led by chief executive Tom Humphreys, with Joseph Parry as executive chair and Sana Khareghani, formerly head of the UK Government's Office for AI, as chief strategy officer.

Era4 is pursuing a £1bn capital-expenditure programme, of which roughly £65m has been deployed across more than 40 sites. It has secured around 50MW of power and is targeting 500MW and beyond, with its first 5MW facility under way in the East Midlands. The plan addresses the binding constraint on UK data-centre growth, the saturated grid that has pushed operators away from the South East.