From behind a screen in late 2019, Jonathan Allen Frost shared his terrible idea with a like-minded white supremacist he’d met online, the feds say. Now, he’s facing 15 years behind bars. The part-time resident of Katy, a city of some 22,000 people roughly 30 miles west of Houston, had suggested attacking a power grid , court documents show. His Ohio-based co-conspirator agreed. They reasoned that at the very least, a successful attempt on grids could plunge the country into chaos and knock out power for months, costing the government millions. It might also trigger an all-out race war or...