Let's get smart about our power grid.artpartner-images/Getty ImagesThe power grid is too old and simple for the growth of extreme weather, EVs, and renewable energy.Chattanooga's utility built a $280 million smart grid, creating $2.7 billion in economic value.This article is part of "Transforming Business: Infrastructure," a series exploring the advancements reshaping US infrastructure.It pays to be smart and Chattanooga, Tennessee, has put a whole new meaning to the phrase.