Otis Singleton
There are two methods of installing power lines that carry electricity to your home: overhead and underground. Overhead power lines are the traditional method of powering homes, with utility poles holding up wires that deliver electricity. Underground power lines, on the other hand, bury cables beneath the ground. While the initial installation cost of underground power lines is higher, there are several benefits, including increased safety, security, reliability, and efficiency. In this article, we will explore the process of switching from overhead to underground electrical power and the advantages and disadvantages of each system.
| Characteristics | Values |
|---|---|
| Safety | Underground power lines are safer than overhead wires as they provide better insulation against power surges and are less prone to causing fires or electrocution accidents. |
| Cost | Underground circuits are more expensive than overhead circuits. |
| Maintenance | Underground power lines are less vulnerable to damage from bad weather, trees, and vehicles, requiring less maintenance. However, locating and repairing malfunctions in underground circuits can be time-consuming and expensive. |
| Aesthetics | Underground power lines improve aesthetics by removing visual clutter. |
| Accessibility | Overhead power lines are more easily accessible and visible, making it less work to check and repair any issues. |
| Installation | Underground line construction requires digging a trench deep enough to lay the wires, which may not be possible in extremely rocky terrain. |
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What You'll Learn
Underground power lines are safer and more reliable
The process of moving existing utility poles and power lines underground is known as "undergrounding". This can be achieved through open trenching, the cheapest method, where utility companies dig into the earth and lay down utility networks before backfilling the trenches. Directional drilling, a less invasive but more expensive option, involves driving a pipe through a subterranean channel without disrupting street-level activities.
While underground power lines offer increased safety and reliability, there are also some considerations to keep in mind. Repairing underground systems can be more expensive and challenging due to the difficulty in identifying and accessing the lines. The initial installation cost of underground power lines is typically higher than that of traditional overhead lines.
However, the benefits of underground power lines can outweigh these potential drawbacks. Underground lines are less visible and provide increased security, making them less susceptible to tampering. They also lose less power over long distances compared to above-ground lines, resulting in increased efficiency.
When deciding whether to switch to underground power lines, it is important to consider factors such as the proximity to trees, the presence of storm damage, and the underlying topography of the area. Consulting with a professional electrician can provide a better understanding of the process and help determine if underground power lines are the right choice for a specific property.
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Installation costs are higher for underground lines
The initial installation costs of underground power lines are often significantly higher than those of traditional overhead lines. This is due to the additional startup costs associated with staff training, purchasing new equipment, and developing new standards for underground installation and maintenance.
For example, in California, it was found that converting overhead distribution infrastructure to underground infrastructure can be up to 10 times more expensive than installing new overhead lines. Similarly, a 2011 paper from the Public Service Commission of Wisconsin estimated that constructing underground transmission lines can be 4 to 14 times more costly than overhead lines for the same voltage and distance.
The higher installation costs of underground lines are further exacerbated by the fact that regulatory agencies typically base their standard power delivery models on overhead line construction. As a result, any proposed underground line installations that exceed specified limits must be justified and approved by the regulatory agency, leading to additional costs and delays.
Furthermore, the utility company would typically bear the differential cost between overhead and underground installation unless physical constraints necessitate undergrounding. These additional costs impact the utility's return on investments and are often passed on to land developers and, ultimately, the end consumers.
While underground power lines offer increased safety, security, reliability, and efficiency, the higher installation costs remain a significant consideration when deciding between overhead and underground power lines.
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Underground lines are vulnerable to earthquakes and flooding
Underground power lines are more secure than overhead wires for several reasons. They provide better insulation against power surges and don't interfere with other utilities like telephone and cable connections. They are also less likely to be damaged by severe weather conditions, falling trees, or vehicle collisions. However, one of the biggest downsides to underground power lines is the initial installation cost, which can be significantly higher than traditional overhead lines.
Despite these benefits, underground lines are vulnerable to earthquakes and flooding. The 2011 Christchurch earthquake in New Zealand, for example, caused damage to 360 kilometers (220 miles) of high-voltage underground cables, cutting power to large parts of the city. In the case of flooding, underground lines need to be engineered differently for protection, which adds to the cost.
The vulnerability of underground lines to earthquakes and flooding is an important consideration in regions with significant river systems, heavy precipitation, and active seismic zones, such as British Columbia (BC). In such areas, the additional engineering and specialized construction required for underground lines further increase the cost compared to overhead lines.
While underground lines offer increased safety and reliability, their vulnerability to earthquakes and flooding highlights the need for careful consideration of the specific regional context when deciding between overhead and underground power lines. The decision should be based on a comprehensive assessment of the benefits and drawbacks of each option, taking into account factors such as cost, maintenance, and the unique characteristics of the local environment.
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Overhead lines are easily accessible and visible
Overhead power lines are easily accessible and visible. If anything goes wrong with your power, it will be less work to check and repair. This is one of the reasons why overhead power lines are the traditional way that homes have been powered for decades.
In the case of underground power lines, the process of locating and repairing a malfunction can be time-consuming and expensive. This is because the lines are not as accessible and visible as overhead power lines.
However, it is important to note that the preference for underground electric power has been increasing, especially in eco-preserved and nature-filled spaces. Underground power lines offer increased safety, as they are not susceptible to trees or debris bringing down power lines. They also provide better insulation against power surges and do not interfere with other utilities like telephone and cable connections.
When deciding between overhead and underground power lines, it is essential to consider the specific situation and requirements. Factors such as cost, appearance, reliability, maintenance, and future upgrades should be taken into account to determine the best approach for each case.
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Underground lines are more aesthetically pleasing
There are several benefits to switching from overhead electrical lines to underground lines. One of the most significant advantages is aesthetics. Underground power lines are much more aesthetically pleasing than overhead lines, which can be unsightly and create visual clutter. This is especially important in residential areas, parks, wildlife areas, and scenic locations, where the natural beauty of the surroundings is a priority.
Underground lines offer a clean and simple solution, with no visible poles or wires, enhancing the overall look of the area. They are also less likely to be damaged by severe weather conditions, falling trees, or vehicle collisions, which can not only cause power outages but also create an eyesore during clean-up and repair.
In addition to their visual appeal, underground power lines are also safer and more reliable. They are less prone to causing fires or electrocution accidents, and their increased security means they are less accessible for tampering. Underground lines are also more efficient, losing less power over long distances than overhead lines.
The main drawback of underground lines is the initial installation cost, which can be significantly higher than traditional overhead lines. Underground lines are also more challenging and costly to repair if issues arise, as locating and accessing the lines can be difficult. However, these challenges can be mitigated with proper planning and by consulting with a licensed electrician.
Overall, the decision to switch to underground power lines should consider factors such as cost, safety, reliability, and aesthetics. Each situation is unique, and it is essential to weigh the benefits and drawbacks of each option before making an informed choice.
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Frequently asked questions
Underground power lines are safer and less prone to accidents and fires. They also provide better insulation against power surges and don't interfere with other utilities. They are also more reliable, less likely to be damaged by severe weather, and lose less power over long distances.
Underground power lines are more expensive to install and maintain. They are also more difficult and costly to repair.
You will need to hire a licensed electrician to perform the work. They will first install an underground meter pedestal outside and perform any other necessary pre-work. Then, a trench will be dug, and the wires will be laid in the trench or placed in conduits for protection. Once the wires are in place, the trench is filled in, and the connections are made. Finally, the old overhead wires are removed.
The cost of installing underground power lines varies depending on several factors. When installing into a new property, costs can range from $1500 to $3000. For existing properties with overhead lines, the cost can be higher, ranging from $3000 to $5000. These costs do not include maintenance and repair expenses.
