An Electrical District No. 3 power station off Maricopa Casa Grande Highway. Source: Google StreetView.

Service to nearly all of the 3,400 residents who lost power for various periods on Saturday afternoon has been restored.

The outage, reported about 3:45 p.m., was affecting Electrical District No. 3 customers in parts of the Senita, Glennwilde and Homestead developments, according to social media.

The company’s website at 6:40 p.m. indicated that power has been restored  .

One person reported on Facebook that power had gone out at the Walmart store. Another reported that the store had been closed because of the outage.

An outage map on the utility’s web page did not indicate the cause of the outage on a day when temperatures reached 114 degrees.

One poster on the The Original City of Maricopa, AZ Facebook page reported seeing an ED3 truck arriving at the power station on Maricopa Casa Grande Highway just after 4 p.m.

The outage came at a bad time for one customer, who was reformatting his computer drive when the power went out, he reported on Facebook. reached out to ED3 for more information but did not hear back.

Temperatures will fall overnight to a low around 89 at 5 a.m. before starting to rise again, according to the National Weather Service.

The weather service has an Excessive Heat Warning in effect through 8 p.m. Monday. It gives the following advice to stay safe:

• Stay indoors and seek air-conditioned buildings.
•  Drink water, more than usual, and avoid dehydrating alcoholic, sugary, or caffeinated drinks.
• Dress for the heat – lightweight and light- colored clothing.
• Eat small meals and eat more often.
• Monitor those with a higher vulnerability to heat, including small children.
• Check in on family, friends, and neighbors, especially the elderly.
• If engaging in outdoor activity, take longer and more frequent breaks and avoid the hottest parts of the day.
• Never leave kids or pets unattended in cars.