Molly Ayala
Underground power lines are electric cables that are buried beneath the ground, as opposed to aerial cables that are supported by large pylons. Underground cables are more expensive to install but have several benefits, including a lower risk of starting wildfires, reduced electromagnetic fields (EMF) emissions, and a decreased risk of damage caused by human activity. They are also more aesthetically pleasing and can be used to transmit power across densely populated or environmentally sensitive areas. The responsibility for underground electricity cables typically falls on regional electricity companies or transmission companies, but it is important to note that the specific ownership and maintenance responsibilities may vary depending on the location and local regulations.
| Characteristics | Values |
|---|---|
| Who is responsible for underground electricity cables? | It depends on the location. In some places, the power company or distribution provider is responsible for the wire, while in others, it is the customer's responsibility. |
| What happens if the cable needs to be replaced? | The customer might be responsible for installing a conduit to the power company's specifications, and the power company will pull new cable in. |
| What if the cable is part of an overhead service area? | The homeowner may be responsible for the underground service conductors. |
| Who owns the cables? | Most service cables belong to the regional electricity company, but some may belong to other bodies, such as the highways authority, Ministry of Defence, or Network Rail. |
| What are some challenges of underground cables? | Underground cable locations might not always be obvious, which can lead to accidental damage or safety hazards. |
| Are there any benefits to using underground cables? | Yes, underground cables can be more aesthetically pleasing and reduce the risk of wildfires and supply interruptions during adverse weather conditions. |
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What You'll Learn
- The regional electricity company is usually responsible for underground cables
- However, the homeowner may be responsible for the underground service conductors
- In the UK, the Office of Gas and Electricity Markets permits companies to recoup undergrounding costs from consumers
- Underground cables are harder to locate and repair than overhead cables
- Underground cables are more expensive to install but may reduce operating costs over time
The regional electricity company is usually responsible for underground cables
When it comes to the replacement or repair of underground cables, the responsibility can vary depending on the location and the type of cable. In some cases, the power company or distribution provider is responsible for the wire, especially if it is a direct-bury cable. They may repair or replace the cable according to their service rules. However, in other cases, the customer may be responsible for installing a conduit to the power company's specifications, and the company will then pull a new cable through it.
It is worth noting that service rules can vary between companies, and there may be exceptions. For example, in overhead service areas, the homeowner may be responsible for the underground service conductors. Therefore, it is always advisable to contact the power distribution provider first to understand their specific service policies and determine the responsible party for any necessary repairs or replacements.
Additionally, when undertaking excavation work near underground cables, careful planning and risk assessments are crucial. Pre-construction information, including the location and ownership of buried services, should be obtained and reviewed to ensure the safe execution of the work. This information is essential for designers and contractors to eliminate or minimise potential risks associated with underground cables.
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However, the homeowner may be responsible for the underground service conductors
In most cases, underground service cables belong to the regional electricity company. However, the homeowner may be responsible for the underground service conductors in certain circumstances. For instance, if you live in an area with overhead power lines, the homeowner may be responsible for the underground service conductors. This is because, in some areas, when the cable is direct bury, it is the customer's responsibility to install conduit to the power company's specifications, and they will pull the new cable in.
It is important to note that service rules vary from company to company, and there may be exceptions to certain service rules. Therefore, it is always best to contact your power distribution provider first to determine who is responsible for the underground service conductors. If the service line is owned by the power company, they will install a new service or repair the existing one.
Additionally, the cost of replacing an underground cable can vary depending on location and amperage requirements. The cost of the wire itself might range from $2000, while the digging might double that expense. However, these numbers are just estimates, and the actual cost can vary significantly.
In conclusion, while the regional electricity company typically owns most underground service cables, there may be situations where the homeowner is responsible for the underground service conductors. It is essential to understand the specific service rules of your power distribution provider and seek clarification from them to determine responsibility and the best course of action in case of repairs or replacements.
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In the UK, the Office of Gas and Electricity Markets permits companies to recoup undergrounding costs from consumers
The Office of Gas and Electricity Markets (Ofgem) is the government regulator for electricity and downstream natural gas markets in Great Britain. It was formed by the merger of the Office of Electricity Regulation (OFFER) and the Office of Gas Supply (Ofgas). Ofgem is independent of the government but accountable to Parliament. This arrangement ensures regulatory decisions are separate from political control, providing long-term regulatory certainty and encouraging market entry and investment.
Ofgem permits companies to recoup undergrounding costs from consumers. Undergrounding refers to the replacement of overhead cables with underground cables. While it offers advantages such as a reduced risk of wildfires and supply interruptions during adverse weather conditions, it can also increase capital costs for electric power transmission and distribution.
Undergrounding is particularly useful in densely populated areas or regions with high land costs, environmental sensitivity, or aesthetic concerns. The lifetime cost difference between undergrounding and overhead lines is generally smaller for lower-voltage distribution networks, with undergrounding costing 12-28% more. However, repairs for underground cables can be more complex and time-consuming, requiring redundant lines to be run.
In the United States, the California Public Utilities Commission (CPUC) Rule 20 also addresses the undergrounding of electrical power cables. Rule 20A projects are funded by all customers of the utility company, while Rule 20B projects are partially funded this way, covering the cost of an equivalent overhead system.
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Underground cables are harder to locate and repair than overhead cables
Secondly, underground cables have higher reactive power, resulting in larger charging currents. This makes voltage control more difficult and can impact the operation of the grid, especially in weak or poorly connected parts. Unlike overhead lines, which can be visually inspected and repaired quickly, underground cables may remain out of service for extended periods while the problem is located and resolved.
Thirdly, modifications and additions to underground cable networks are generally more tedious due to the difficulty in locating specific lines and sections. The cable route must be carefully designed to navigate any potential obstacles, and the laying method, including trench digging, duct fitting, and cable positioning, is crucial for the effectiveness and efficiency of the system.
Furthermore, underground cables require proper insulation to withstand high voltage flows, and the depth of cable laying depends on the voltage capacity of the cable. Insulation requirements add complexity to the installation and maintenance process, and the minimum depth requirements ensure the safety and functionality of the underground cable system.
Lastly, while underground cables offer reduced electromagnetic field (EMF) emissions, the depth of the cable installation can impact the resultant external magnetic field. Shallower cable depths may result in higher EMF levels on the surface, requiring additional magnetic shielding. These factors contribute to the overall complexity of repairing and maintaining underground cables compared to their overhead counterparts.
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Underground cables are more expensive to install but may reduce operating costs over time
The installation of underground cables is more expensive due to the labour-intensive process of digging trenches and using boring techniques to create suitable pathways. The cost of installing underground cables ranges from $20 to $40 per 1-foot, while above-ground lines cost around $10 per 1-foot. In highly urbanised areas, the cost of underground transmission can be 10–14 times as expensive as overhead lines.
Underground cables also have higher costs associated with repairs and maintenance. If a fault occurs, the cost of finding its location, trenching, cable splicing, and re-embedment can be five to ten times more expensive than repairing an overhead line, where the conductors are visible and more easily accessible. Additionally, underground lines are more difficult to modify after installation, and such modifications are more expensive due to the inability to readily access or relocate sections of the lines.
However, underground cables may reduce operating costs over their lifetime. Underground lines have a lower risk of starting wildfires and reduce the risk of electrical supply interruptions during high winds, thunderstorms, or heavy snow and ice storms. They are also better protected against weather conditions and are less susceptible to damage from severe weather, such as lightning, hurricanes, tornadoes, and other winds. Underground cables also pose no hazard to low-flying aircraft or wildlife, and they have a reduced risk of damage caused by human activity, such as theft, illegal connections, sabotage, and accidents.
The reduced visual impact of underground cables is another advantage, improving the aesthetic quality of the landscape. Underground cables require a narrower surrounding strip of land for installation, typically 1–10 meters, while overhead lines require a much wider area to be kept clear for safety and maintenance purposes. In some cases, the UK regulator Office of Gas and Electricity Markets (OFGEM) permits transmission companies to recoup the cost of undergrounding in their prices to consumers, especially in National Parks or designated Areas of Outstanding Natural Beauty (AONB).
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Frequently asked questions
It depends on the location. In some places, the power company or distribution provider is responsible for repairing or replacing underground cables. In other areas, it is the customer's responsibility.
Most service cables are owned by the regional electricity company. However, some cables may be owned by other bodies, such as the highways authority, Ministry of Defence, or Network Rail.
If you are experiencing issues with your underground electricity cable, you should contact a qualified electrician to assess the problem and determine the appropriate course of action. They will have the necessary tools and expertise to pinpoint the issue and recommend repairs or replacement if needed.
