What Does a Green Grid Mean, and Can Biden Make One?

The biggest machine on Earth delivers more than $400 billion of electricity a year across nearly 7 million miles (11 million kilometers) of transmission and distribution lines. It’s the U.S. power grid, an interconnected system of generating plants, wires, transformers and substations that keeps the lights on for the homes, offices and factories of the world’s largest economy. Now, President-elect Joe Biden wants it to be carbon-free by 2035 as part of his ambitious plans to confront climate cha