Read the Latest Insights on Standby Generator Maintenance, Emergency Power Planning, and Protecting Your Home & Business

10 biggest blackouts in united states history graph hurricanes customer hours national standby repair

The largest blackout in U.S. history by far was Hurricane Maria, which left hundreds of thousands of residents in Puerto Rico and the U.S. Virgin Islands without power for more than 100 days total. This was not only the biggest, but also the longest blackout in U.S. history.

When Hurricane Maria hit, Puerto Rico was still dealing with the aftermath of Hurricane Irma (the 4th largest blackout) from only two weeks prior—meaning roughly 80,000 people were already without power as Maria approached.

The real takeaways can be gleaned from the aftermath. Roughly three weeks after the hurricane subsided, 58% of waste water treatment plants were relying on backup generators for power, and only a quarter of hospitals had functioning electricity.

Over 90% of Puerto Rico was disconnected from the main power grid, and the New York Times deemed the region “Generator Island.”

“Generators now power big-box stores, high-rise apartment buildings, auto shops, fast-food restaurants, wastewater treatment plants and little country homes,” the 2017 article says.

Here’s the bottom line: very few (if any) residential, commercial, and public facilities can function in modern society without power. We rely on electricity for food, water, sewage, and municipalities. Without reliable backup power, we set ourselves up for the potential loss of any and all of these basic necessities.

Don’t get caught in the dark. We’ve compiled a number of resources for your home and business in the event of a major outage:



7 Tips to Prepare Yourself for a Prolonged Power Outage

Top 5 Standby Generators for Homes & Businesses

5 Common Mistakes You Might be Making in a Power Outage


The Cost of Power Outages on Your Business

Top 5 Standby Generators for Homes & Businesses

How to Choose the Right Commercial Generator


How Food & Beverage Industry Leaders Can Prepare for Power Outages

What Happens When the Power Cuts Out at a Medical Facility?

Preventing Power Failure in Hospitals and Assisted Living Facilities


Kristopher Schwind is the proud owner of National Standby Repair.