Wiktor Wise
Underground cables have been used to transmit power since 1890, when Vincent de Ferranti installed the first 10,000-volt concentric cable in the UK. Underground cables are generally more resilient than overhead lines in extreme weather and can protect against blackouts during peak load hours and severe weather events. They are also more aesthetically pleasing and can help protect or enhance biodiversity and historic features. However, challenges to underground cables include the high cost, the lack of public acceptance, and the technical difficulties of sending AC electricity underground. In most cases, the responsibility for maintaining underground cables falls on the property owner, from the property line up to and including the power meter socket.
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What You'll Learn
- Property owners are responsible for underground cables from their property line to the power meter
- Power companies can adopt a policy to assume responsibility for underground cables
- Underground cables are more resilient to extreme weather and reduce the risk of fires
- Underground cables are harder to fix than overhead lines, impacting the reliability of the grid
- Underground cables are more expensive and face technical challenges compared to overhead lines
Property owners are responsible for underground cables from their property line to the power meter
As a property owner, it is important to be aware of what parts of the power lines you are responsible for. The first step is to determine if your home is served by underground power cables or overhead power lines. If you have underground power lines, then you are responsible for the underground power cables and the meter box components on your property. This includes any underground utility service cables that run from your property line up to and including your power meter socket. These lines are typically installed by the builder or developer when your property is constructed.
In some cases, power companies may institute a policy of assuming responsibility for underground service connections. For example, Commonwealth Edison charges a flat customer fee to install, own, and maintain the underground service connection from the underground distribution system to the house. Similarly, EPCOR Edmonton is responsible for the power meter and the service line from the transformer to the property line.
As a property owner, you may also be responsible for any underground lines that connect your detached garage to your home. These lines are usually installed by the builder or developer. It is recommended that you consult with a qualified electrician if you are considering making any additions or upgrades to your power service.
Overall, as a property owner, it is your responsibility to maintain and repair any underground utility service cables from your property line up to and including your power meter socket. This ensures that your home's electrical system is safe and functional.
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Power companies can adopt a policy to assume responsibility for underground cables
Additionally, power companies have the resources and expertise to efficiently install, own, and maintain underground cables. For instance, Commonwealth Edison instituted a policy of assuming responsibility for underground services, charging a flat customer fee of $1.00 per trench foot to install, own, and maintain the underground service connection from the distribution system to the house. This uniform charge provides clarity and predictability for customers, who would otherwise have to navigate complex regulations and potentially bear the full cost of repairs.
Underground cables also have long-term positive visual impacts compared to overhead lines, enhancing the aesthetics of the surrounding landscape and visual resource experienced by local communities and visitors. This is especially important in nationally designated landscapes such as National Parks, The Broads, and Areas of Outstanding Natural Beauty, where the impact of overhead lines on scenery and cultural heritage may be unacceptable.
Furthermore, underground cables are more resilient in extreme weather conditions than overhead lines, reducing the risk of significant damage to the surrounding area. By assuming responsibility for underground cables, power companies can contribute to the protection and enhancement of biodiversity and historic features in the communities they serve.
Overall, by adopting a policy of assuming responsibility for underground cables, power companies can improve cost efficiency, enhance customer experience, and positively impact the environment and local communities.
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Underground cables are more resilient to extreme weather and reduce the risk of fires
Burying power lines underground is an effective way to reduce the risk of fires and increase resilience to extreme weather events. This is especially important in the context of climate change, as extreme weather conditions, such as heat waves and hurricanes, are becoming more frequent and intense.
Underground cables are less susceptible to damage from extreme weather, including high winds, lightning, storms, and snow. They are also better protected against sparks, which are a common cause of wildfires in dry areas. Burying power lines can almost eliminate their potential to start fires, reducing the risk of deadly and destructive wildfires. This is a significant concern for power companies, as their equipment can often ignite fires during extreme weather.
In addition to improving safety, underground cables can also strengthen utility systems and provide greater reliability. They are less likely to cause power outages during peak load hours and severe weather events. Underground cables also have lower maintenance needs, as they are not exposed to the same weather hazards as overhead lines. The insulation used in underground cables is typically extruded plastic, which requires little maintenance and has a lower risk of corrosion.
However, burying power lines also comes with challenges. It is a costly process, with prices reaching millions of dollars per mile, and the work can be slow and complex. It requires negotiations with property owners, coordination with other utility providers, and compliance with various regulations. Additionally, underground cables have a shorter lifespan than overhead lines due to factors such as insulation degradation and ground movement.
Despite these challenges, burying power lines in high-risk areas is a bold step towards enhancing safety and climate resilience. It is a long-term investment that can help mitigate the impacts of extreme weather and reduce the risk of wildfires.
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Underground cables are harder to fix than overhead lines, impacting the reliability of the grid
Underground cables are harder to fix than overhead lines, which can impact the reliability of the grid. While underground cables are not more prone to damage than overhead power lines, they are more challenging to repair when issues arise. This is because it is more difficult to locate and access the problem area, resulting in prolonged outages while repairs are underway.
The process of repairing underground cables can be intricate and time-consuming. When an underground cable malfunctions, the issue must first be identified, which can be challenging due to the limited accessibility of the cable. This diagnostic phase may involve specialized equipment and expertise to pinpoint the exact location and nature of the fault. Once the problem is understood, the repair work itself can begin, requiring careful excavation and cable replacement or splicing techniques.
In contrast, overhead power lines are more accessible, making it easier for maintenance crews to identify and address issues. Repairs can often be completed without extensive digging or complex troubleshooting, reducing the time required for restoration. This accessibility contributes to the overall reliability of the grid by minimizing downtime during maintenance or repair activities.
The impact of underground cable repairs on grid reliability is significant. While the frequency of damage may be similar between underground and overhead cables, the duration of service disruption is typically longer for underground cables. This extended outage duration affects the overall dependability of the electrical grid, potentially causing inconvenience or disruptions to homes, businesses, and essential services.
Despite the challenges of repairing underground cables, they offer certain advantages. For example, they are less susceptible to extreme weather conditions and can enhance the visual aesthetics of an area by reducing the prominence of power lines. Additionally, in certain scenarios, such as transmitting electricity across open seas, underground cables, particularly direct current (DC) cables, are the preferred choice due to their ability to transmit large amounts of power over long distances.
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Underground cables are more expensive and face technical challenges compared to overhead lines
Underground cables are significantly more expensive to install than overhead lines. One of the main reasons for this is the insulation requirements: underground cables must be insulated along their entire length to protect them from the soil, weather, and chemicals, whereas overhead lines only need insulation at the contact tower. This makes underground cables more expensive to produce, and their increased insulation also makes them harder to replace and upgrade.
The higher cost of underground cables is further exacerbated by the complexity of their installation. Contractors must consider conflicting power lines and soil conditions, which is not a factor for overhead lines. Overhead lines are considered relatively easy to install, and it is also simpler to place extra connections.
While underground cables are more expensive, they are often preferred by the public. They are considered to have a positive visual impact, particularly in nationally designated landscapes such as National Parks, The Broads, and Areas of Outstanding Natural Beauty. Underground cables are also less likely to cause damage to the landscape, archaeology, and cultural heritage.
In addition, underground cables are more resilient in extreme weather conditions than overhead lines. However, despite these benefits, the high cost of underground cables means that overhead lines remain the standard technology in European high-voltage power grids.
In terms of maintenance, there is conflicting evidence regarding the comparative costs of underground and overhead lines. While some sources claim that underground cables are harder to maintain, others state that underground wiring can lead to decreased maintenance costs.
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Frequently asked questions
The National Grid is responsible for maintaining its transmission system and managing a programme of asset replacement.
The customer is usually responsible for the ownership, installation, and maintenance of underground electric service connections to their home.
In the US, the property owner is responsible for any underground utility service cables that run from their property line up to and including their power meter socket.
Underground cables are better protected against extreme weather and other catastrophic events than overhead lines. They also have a positive visual impact compared to overhead lines.
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