Ohmium International, a leading green hydrogen company that designs, manufactures, and deploys advanced proton exchange membrane (PEM) electrolyzer systems, announced the close of a $250 million Series C growth equity financing. The round was led by TPG Rise Climate, the dedicated climate investing strategy of TPG's global impact investing platform TPG Rise, and also included participation from Hanover Technology Investment Management and existing investors Energy Transition Ventures and Fenice Investment Group.