SolidUltra has secured €3 million to develop modular solid-state transformers for a new generation of AI data centers. The French company is targeting a particularly consequential part of the infrastructure stack: converting medium-voltage grid electricity into the 800-volt direct current that future high-density computing facilities are preparing to distribute. Founded in June 2026 and based in Massy, France, SolidUltra secured the funding within three months of incorporation, backed by its…