The energy transition to renewable electricity is gathering speed, with wind farms and solar panels popping up around the world. While renewables help us cut carbon, they have their own challenges. In the absence of grid-scale storage, what happens when the wind doesn’t blow or the sun doesn’t shine? The good news is that there are people like Jim Walsh, general manager of the grid software business at GE Digital, who are working on the problem and helping grid operators make sure that our power doesn’t go out. “This problem is way too big for paper and a pencil,” Walsh says.