Justin Eggart and fellow engineers working inside GE Power’s Monitoring and Diagnostics Center in Atlanta were halfway through their shift a few months ago when they noticed something strange. The center, the largest of its kind in the world, looks a lot like a smaller version of NASA’s mission control center. It has banks of computers and a wall-to-wall, colorful LED screen flashing real-time operating conditions inside 5,000 turbines, generators and other equipment churning away at more than 950 power plants located in 75 countries and serving 350 million people.