The clean energy industry is undergoing a renaissance of sorts, as investors revisit it and its emerging array of technologies aimed at powering the AI boom.Artificial intelligence (AI) stocks seem to garner most of investors' attention these days. Yet a basket of industrial, energy, and technology companies that work to efficiently power that trend has quietly doubled in the past six months.Since the market's "liberation day" lows in April, the Invesco WilderHill Clean Energy ETF (PBW 1.91%) has gained mor ...