America's biggest power grid pushed to the edge of an all-time record this week, and the bigger force behind it may be tied to data centers. PJM Interconnection, which delivers power to 67 million people across 13 states and Washington, D.C., saw electricity demand surge to roughly 163 gigawatts on Thursday as a brutal heat dome pushed heat indices past 110 degrees from Washington to New York, according to Reuters. That fell just short of the grid's 2006 all-time peak of 165,563 megawatts, even after PJM had forecast Thursday's load could top 166,000…