Illustration: Brendan Lynch/AxiosAI giant Nvidia and boldface names in tech and finance are backing a new startup that aims to transform data centers into flexible grid assets instead of liabilities.Why it matters: Emerald AI is emerging from stealth today as the AI surge risks straining grids, and hyperscalers are limited by power availability.Driving the news: Radical Ventures led the $24.5 million seed round with participation from Nvidia, AMPLO and others.Individual backers include ex-climat...