At just 27 years old, this entrepreneur is remaking America’s energy industry [A California company called Valar Atomics built its first nuclear reactor in Utah because the regulatory burden in California made it impossible to build it in California.]

At 16 years old, Isaiah Taylor realized nuclear reactors were being made too big. At 19, he married his childhood sweetheart, Sophie, and at 24 he founded Valar Atomics. “I’ve always just kind of known what I wanted,” the young founder told the Deseret News. “I want to build nuclear reactors, and I wanted to get married to Sophie. So why wait?” The Southern California-based company is a manifestation of his original vision: nuclear reactors need to be smaller, safer and made on a factory line. Now, at 27, Taylor plans to see his first microreactor come alive in Orangeville,...