A swarm of power outages just before 2 PM left nearly 10,000 customers without power around Capitol Hill, Madison Park, and Madrona.

There was no immediate cause reported for the outage but CHS has received reports of a large boom — possibly a blown transformer — in the Central District.

A Seattle Fire medic response was underway near 23rd and E Pike. A witness tells CHS that it appears that an employee at the nearby Seattle City Light substation was transported from the scene by ambulance. Seattle Fire said it is also evaluating a second patient at the scene after a “blown transformer” at the substation. CHS has also been told there is a third person with injuries at the scene.

UPDATE: According to Seattle Fire, one patient was transported to Harborview with serious injuries after being thrown 20 feet in the explosion. About 20 minutes after the first victim had been transported from the scene, Seattle Fire was called back to treat a second patient reported as a 63-year-old male worker who suffered first-degree thermal burns from the blown transformer. That patient had apparently been injured in the initial blast. As medics arrived to handle the second call, a third patient, a male in his 20s, also said he suffered cuts and contusions in the blast and was taken to the hospital.

As of 2:10 PM, City Light reported three separate outages with no listed estimates for restoration.

Fire and security alarms around the area were triggered by the outage.

UPDATE 2:53 PM: The northern arc out of the outage has been restore to service according to City Light leaving around 5,600 customers without power.

UPDATE 3:15 PM: The outage has been reduced to the Madison Park/Madrona component with around 2,400 customers without power.

UPDATE 3:35 PM: Power has been restored to all affected customers, according to City Light.

UPDATE 4:50 PM: Here is City Light’s report on the incident:

Three Seattle City Light employees were injured at the East Pine Substation today around1:55 p.m. and were taken to Harborview. The extent of their injuries is still to-be-determined.

The construction crew was trying to install a ground rod inside the substation when their equipment caused an electric arc from an underground power line.

“Our first concern is for our injured employees and we send them our best wishes for a fast recovery. Our thoughts also go out to their family and friends,” said Jim Baggs, Seattle City Light Interim General Manager and CEO. “We don’t have all the details yet on this accident, but rest assured that City Light employees make safety their number-one priority.”

The accident triggered a power outage affecting nearly 10,000 customers across a wide area of Seattle. The outage has been restored.