The massive heat dome followed by thunderstorms that put the Central and Eastern parts of the country into a swelter in early July, and shut down many Independence Day celebrations in the region, also shut down parts of the power grid.

Multiple news sources reported nearly 1 million outages across the country, ranging from the North Atlantic to the South. The numbers were provided by the online data source, poweroutage.com.

New Jersey, New York, Pennsylvania, Virginia and North Carolina experienced the highest number of outages in the Atlantic region. Michigan, Illinois and Ohio experienced a high number of outages in the Midwest, while Texas and Missouri were heavily impacted in the South.

The weather and power disruptions also did not discriminate against service providers. PPL, First Energy, Con Edison and DTE Energy were among those scrambling to restore power in the affected areas.

The power outages were the result of a rare confluence of extreme weather conditions. Heat warnings or advisories issued by the National Weather Service affected about 185,000 people—more than half the nation’s population. Temperatures reached as high as 115°F in some areas. Making matters worse, the heat wave gave way quickly to powerful thunderstorms, with torrential rain and wind that uprooted trees and damaged power lines.

The extreme weather forced the cancellation, delay or rescheduling of 4th of July celebrations in multiple cities, including Washington D.C., Boston, New York and Philadelphia.

As of Monday, July 6, the number of outages still exceeded 373,000, according to Reuters, but utilities deployed emergency crews to rapidly restore power. As a result, the numbers continued to decline throughout the week. As of Thursday, July 9, the number of outages declined to 78,000, according to figures provided by poweroutage.com.