This article is an irrelevant mess.
"Between 1979 and 2003, heat waves killed at least 8,015 Americans, according to the Centers for Disease Control and Prevention"
That's hardly an impressive stat. So, on average, roughly 334 people per year die due to heat waves? That's statistically invisible to the number of people who die each year due to winter, which is usually around 100,000.
The headline of this piece was a complete lie. The US grid has been holding up remarkably well this season, despite the heat. The northeast outage was entirely storm related, and not due to any shortage on the part of the grid. The title of this article should have been "Global Warming to Save Lives". Just as silly, but certainly more accurate.