America’s grid upgrade hinges on a 400-ton machine designed in the 1800s — and just one U.S. mill makes the special steel inside it

From the source

Americans have a lot of plans for the country’s power grid. Some people want to expand renewable energy by building solar and wind farms. Others want to add new coal- or natural gas-fired power plants. There are those who want to provide power to some unknown number of data centers processing artificial intelligence algorithms. To accomplish any of these goals, the country will need a significant number of pieces of equipment whose design was invented in the late 19th century: large power transformers. These giant metal structures are about the size of a two-story house and weigh as much as 400 tons – roughly equivalent to a fully loaded Boeing 747. They convert high voltages used to transmit electricity down to voltage levels people can use in their homes and businesses. And they are made largely in the same way they were when they were invented 150 years ago. Many of the large power transformers in service in the U.S. and around the world are aging beyond their intended lifespans.…

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