For nearly a century, America’s electric grid has lived up to its reputation as a one of the world’s greatest technological marvels, capable of delivering power to millions of residents and businesses safely, affordably, and - most important - reliably. But lately, that reliability has been called into question, with new government regulations forcing the disorderly closure of always-on power plants in favor of renewables, and demand exceeding supply during critical times in several regions of the country.