With 2.2 million customers spread across 7,600 square miles of service area, isolated power outages occur daily. Most often, these disturbances last just a few seconds, but some may last longer, depending upon the cause. While weather is the most common culprit, events like vehicle accidents or small animals contacting power lines can also cause outages.

Nationwide, weather-related problems (storms, winds, tree damage, high demand for electricity during periods of high temperatures and humidity) are the chief cause of disruptive power outages. Based on data supplied by the Edison Electric Institute.

Outage Types: Momentary vs. Sustained 

Do you know the difference? Despite the inconvenience, momentary outages actually prevent more serious power problems.

Momentary outages

• If your digital clocks are flashing 12:00 or if your lights blink or go out for a few moments, a momentary outage has occurred.
• Momentary outages are often caused by some type of interference on power lines, such as an animal or tree branch coming in contact with the line.
• We place automatic devices on our power lines to protect them in somewhat the same way circuit breakers protect your home's wiring. The devices quickly isolate the problem and perform a function similar to resetting a circuit breaker in your home-safely restoring power to the line within moments.
• While momentary interruptions are inconvenient, in the majority of cases, these automatic devices prevent longer outages.

Sustained Outages

• Sustained outages are planned or accidental total losses of power in a localized area of the community. These types of outages usually last more than five minutes.
• A sustained outage may be caused by storms, accidents or equipment damage.
• Sometimes it's necessary for us to intentionally interrupt service in order to safely perform equipment repairs and maintenance. If possible, we notify customers in advance of a planned interruption.
• If you use a generator during a sustained outage, please read our tips on Safely Operating Portable Generators.