Read More2 minute read CompaniesTechnologyHeliogen Announces Testing Of Supercritical CO2 Energy System Heliogen Inc. (NYSE: HLGN) – a renewable energy technology company, announced May 3rd that the company struck a…byPetya TrendafilovaAugust 18, 2022 1 share 1 0 0 0 0 0 0 No comments