Wiktor Wise
Underground power lines are becoming more common, especially with the advent of new technologies such as electric vehicles. While underground power lines are safer and more aesthetically pleasing, they are also more expensive to install and maintain. The process of moving power lines underground, known as undergrounding, can cost billions of dollars and may increase electricity prices for consumers. Additionally, underground power lines are more vulnerable to certain types of damage, such as flooding, and are more difficult to repair. Despite these challenges, undergrounding is still considered a viable option for improving the safety and reliability of power distribution, especially in areas prone to high winds, heavy snow, and other severe weather events that can damage above-ground utility poles and power lines.
| Characteristics | Values |
|---|---|
| Cost | Much more expensive, especially for higher-voltage lines |
| Reliability | Doesn't improve reliability, vulnerable to different types of damage which can lead to longer outages |
| Safety | Reduces risk of electrocution and harm to electrical professionals |
| Maintenance | More difficult and expensive to repair |
| Capacity | Issues with cable ampacity derating, underground capacity has a definitive limit |
| Vegetation | More disruptive to the environment, requires vegetation management to prevent damage |
| Installation | Requires insulated conductors, trenching or directional drilling |
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What You'll Learn
Underground power lines are more expensive to install
Underground power lines are significantly more expensive to install than overhead power lines. The cost of installing the same length of wire underground can be up to 10 times as much as installing it above ground. This is due to a number of factors, including the need for insulated conductors, the high cost of trenching labour, and the difficulty of modifying or repairing underground lines.
The process of installing underground power lines, known as "undergrounding", typically involves digging trenches, laying wires, and then refilling the trenches. This labour-intensive process is made even more expensive by the need for insulated conductors in underground lines, as transmission lines intended for open-air use are not suitable for burial due to heat dissipation issues. The cost of insulation is further influenced by the fluctuating prices of metals and petroleum products used in its production.
Trenching labour costs can range from $35 to $65 per hour, and the overall cost of trenching can be between $500 and $1,200 for a 100-foot trench. The length, depth, soil type, and ground conditions can all impact the final cost of trenching. Additionally, tree trimming or removal may be necessary to clear the path for the electrical wire, adding to the overall expense.
Another factor contributing to the high cost of underground power lines is the difficulty of modifying or repairing them. Unlike overhead lines, which can be easily tapped, rerouted, or modified, underground lines are more challenging to access and relocate. As a result, modifications to underground power lines are significantly more expensive. Similarly, repairing faults in underground lines can be five to 10 times more costly than fixing issues with overhead lines, as locating the fault, trenching, cable splicing, and re-embedment are complex and time-consuming processes.
While underground power lines offer advantages in terms of protection from weather and certain types of damage, the high installation and maintenance costs are significant drawbacks. The decision to install underground power lines must carefully consider the balance between reliability and cost-effectiveness.
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They are harder to maintain and repair
The main reason why power lines are not placed underground is the cost. The process of moving power lines underground is extremely expensive, and this cost would ultimately be passed on to the consumer in the form of higher electricity bills. In North Carolina, for example, undergrounding the entire state's utilities would raise electricity prices by 125%.
However, another important consideration is the difficulty of maintenance and repair. Overhead power lines are easily accessible, making them cheaper and easier to fix when they break. In contrast, underground wires are harder to reach, and it can be difficult to pinpoint the exact location of an interruption. This means that routine maintenance takes longer and is more expensive.
Underground wires are also more susceptible to certain types of damage. For instance, they can be unearthed during heavy rain, and they are more vulnerable to flooding. While they are protected from wind, ice, and falling trees, underground wires are still at risk of being accidentally severed, which carries a similar risk to damaging underground gas lines.
Additionally, the capacity of underground wires is limited by their inability to dissipate heat. This can lead to problems when a large number of people in a neighbourhood start using high-energy appliances, such as Tesla vehicles.
Despite these challenges, many communities are moving towards underground power lines, particularly in light of the dangers posed by cluttered and ageing aboveground power lines. While undergrounding is more expensive, it can help to reduce power outages and decrease the risk of electrocution for electrical professionals.
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They are susceptible to damage from heavy rain
Underground power lines are susceptible to damage from heavy rain and flooding. During Hurricane Sandy in 2012, for instance, underground electrical equipment was flooded. While underground lines are protected against certain types of damage, they are more vulnerable in other ways that can lead to longer outages.
In geographical areas with a high water table, underground power lines are not an option. Routine maintenance is difficult, and service restoration can take much longer than with above-ground power lines because it is challenging to pinpoint the exact location of the interruption.
The cost of repairing underground power lines is often higher than for above-ground lines. This is because, when the power goes out, utility companies first need to identify the location of the fault before they can fix the line.
The decision to install power lines overhead or underground needs to be made thoughtfully, considering factors such as cost, reliability, safety, and environmental impact.
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They are more environmentally disruptive
The process of moving power lines underground, or "undergrounding", is more environmentally disruptive than overhead power lines. This is due to several factors, including vegetation clearance, habitat destruction, soil compaction, and long-term vegetation management.
Firstly, vegetation must be cleared to allow for construction and vehicular access during the undergrounding process. This clearance can result in the destruction of natural habitats, particularly when heavy equipment is involved. Additionally, soil compaction during construction can limit biodiversity by impacting the health of plants and other organisms in the soil.
Secondly, long-term vegetation management is necessary to prevent deep-rooted plants from damaging underground lines. This management can involve pruning, watering, and inoculating trees against pests, as well as swiftly removing unstable trees to prevent them from damaging power lines during storms. While vegetation management can help reduce the risk of power outages, it is an ongoing process that requires time, resources, and ecological expertise.
In addition to the ecological disruptions caused by undergrounding, the process can also lead to increased costs for consumers. The installation of underground power lines can be significantly more expensive than overhead lines, with costs being passed along to customers in the form of higher electricity rates. In some cases, the decision to underground power lines can result in substantial increases in electricity prices, as seen in the projected 125% increase in North Carolina.
While undergrounding can provide benefits such as reduced outages due to ice, snow, and falling trees, it is important to consider the environmental and economic impacts. The disruptions to vegetation, habitats, and soil, coupled with the potential for increased consumer costs, highlight the complexities of transitioning to underground power lines.
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They are less reliable in certain situations
While underground power lines are protected against certain types of damage, they are more vulnerable in other ways that can lead to longer outages. For instance, underground wires are susceptible to being unearthed during heavy rains, which can be challenging and costly to repair. Additionally, underground wires are limited in their capacity as they cannot dissipate heat in the same way that overhead wires can. This can lead to issues when there is a high demand for electricity in a neighbourhood, such as with the increasing use of electric vehicles.
Underground power lines also come with significant costs. The process of burying power lines can be extremely expensive, with estimates suggesting it can more than double the cost of a distribution project and increase the cost of a transmission line project by up to 20 times. These costs are often passed on to consumers in the form of higher electricity rates or taxes. In some cases, the decision to bury power lines has resulted in significant increases in electricity prices.
Furthermore, underground power lines can be more difficult to maintain and repair. Routine maintenance is challenging, and service restoration can take longer as it is harder to locate the exact source of the problem. The process of repairing underground cables can be more expensive and time-consuming than fixing overhead lines, which are easily accessible for repairs and capacity additions.
In addition to the financial and maintenance considerations, underground power lines can also face geographical limitations. In areas with a high water table or rocky subsoil, burying power lines underground is not a viable option.
Overall, while underground power lines may offer some advantages in certain situations, they are less reliable in other respects. The decision to implement underground power lines must carefully consider the specific context, balancing the benefits with the potential drawbacks and increased costs.
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Frequently asked questions
Underground power lines are more protected from the elements and falling trees, which can cause power outages.
Underground power lines are much more expensive to install and maintain. They are also more vulnerable in some ways, such as to flooding.
Underground power lines are more disruptive to the environment, as vegetation must be cleared for construction. They are also more difficult to access for repairs, which can take longer.
Underground power lines are less susceptible to damage from wind, rain, lightning, falling trees, and other weather events. They can also decrease the risk of electrocution for electrical professionals.
Underground power lines can be safer in some ways, as they are less likely to be damaged by severe weather or falling trees. However, they also come with their own set of risks, such as flooding or unintentional severing of cables.
