If you’ve ever seen a squirrel running across a power line, it raises a natural question: why doesn’t a squirrel get electrocuted? The answer comes down to how electricity works. While squirrels often walk away unharmed, they are also one of the leading causes of power outages.
Why Squirrels Can Sit on Power Lines Safely
Electricity only flows when there is a complete path, or circuit. In most cases, squirrels remain safe because they are not creating a circuit. When a squirrel is sitting on a single power line, its entire body is at the same electrical potential as the wire. Because it is not touching the ground or another wire, there is nowhere for the electricity to go, and no current flows through its body.
The situation changes instantly if the squirrel touches two wires at once or makes contact with a wire and a grounded object, such as a pole or transformer. In those cases, the squirrel becomes part of the circuit, allowing electricity to pass through it.
How Squirrels and Other Animals Cause Power Outages
Even though squirrels often avoid electrocution, they still pose a real risk to electrical infrastructure. One of the most common issues occurs when a squirrel creates a short circuit by bridging the gap between a wire and a grounded surface. When this happens, protective equipment automatically shuts off power to prevent further damage.
Squirrels can also cause problems by chewing on electrical materials. Their teeth grow continuously, so they gnaw on objects to keep them trimmed. Unfortunately, that sometimes includes wire insulation and protective coverings, which can lead to exposed conductors, overheating, and equipment failure.
Additionally, substations and transformers attract animals because they provide warmth and shelter. When squirrels or other wildlife enter these areas, they can accidentally come into contact with energized equipment or create connections between components that were never meant to touch.
The Impact of Animal-Related Power Outages
Animal-related power outages are more common than you think! Nationwide, animals are responsible for roughly 11 percent of power outages. Squirrels alone have been linked to tens of thousands of outages in a single year, and estimates suggest they account for as much as 10 to 20 percent of all service interruptions. Across the industry, wildlife is considered the second-leading cause of power outages, behind severe weather.
In Alabama, and in Southern states in general, the risk is even higher due to our environment. Dense tree coverage provides easy access to power lines, and active wildlife populations increase the likelihood of contact with electrical equipment. Many areas also rely on above-ground distribution systems, which makes infrastructure more accessible to animals.
What Power Companies Are Doing to Prevent Outages
Utility companies are proactive when it comes to reducing animal-related outages. One of the most effective strategies is the installation of wildlife guards, which act as barriers to prevent animals from reaching sensitive equipment on poles and transformers.
In higher-risk areas, utilities also use insulated coverings and protective materials to reduce the chance of accidental contact. Vegetation management plays a major role as well, with regular tree trimming to limit access points and reduce the ability of squirrels to jump onto lines.
Ongoing system improvements continue to make a difference. Modern equipment is often designed with greater spacing between energized parts and configurations that reduce the likelihood of animal interference. At the same time, utilities closely monitor outage data to identify patterns and address problem areas before they lead to larger disruptions.
The Bottom Line
Squirrels are not immune to electricity. They are simply able to avoid it most of the time by not completing a circuit. However, when they do create that path, the results can be immediate and widespread, leading to outages, equipment damage, and service interruptions.
That is one reason utilities continue investing in smarter infrastructure, regular maintenance, and wildlife protection measures. Keeping the lights on is not just about responding to storms. It also means managing the everyday challenges that come with sharing the environment with active and persistent wildlife.