Power Outage Disrupts Hundreds of Flights at Denver Airport

Xcel Energy identifies faulty new equipment as cause of widespread blackout.

Apr. 8, 2026 at 5:39am

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A highly stylized, geometric illustration depicting the towering architecture of Denver International Airport, with sweeping gradients of color and sleek, streamlined forms conveying the scale and impact of the power outage that disrupted hundreds of flights.A power failure at one of the nation's busiest airports exposed the vulnerability of critical infrastructure to even minor equipment malfunctions.Denver Today

A power outage at Denver International Airport last month, which trapped passengers in elevators and delayed nearly 500 flights, was caused by a malfunctioning piece of new equipment being installed by Xcel Energy, the utility company confirmed.

Why it matters

The widespread disruption at one of the busiest airports in the U.S. highlights the critical importance of reliable power infrastructure for major transportation hubs. Even temporary outages can have significant ripple effects on travel and commerce.

The details

Xcel Energy said the March 18 blackout occurred as crews were energizing a new transformer at a substation serving the airport. The failure of this single piece of equipment triggered the broader power failure across the facility.

  • The power outage occurred on March 18, 2026.
  • Xcel Energy confirmed the cause of the outage on April 8, 2026.

The players

Xcel Energy

The electric and natural gas utility company that provides power to the Denver metropolitan area, including Denver International Airport.

Denver International Airport

One of the busiest airports in the United States, serving over 69 million passengers annually.

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The takeaway

The Denver airport power outage underscores the vulnerability of critical infrastructure to even small equipment failures, and the need for robust backup systems and redundancies to minimize the impact of such disruptions on travelers and businesses.