Underground Power: A Guide To Burying Electric And Utility Lines

Underground power lines are an alternative to overhead power lines, which use utility poles to deliver electricity to homes and businesses. Underground power lines have several benefits, including increased safety, security, reliability, and efficiency. They provide better insulation against power surges and do not interfere with other utilities like telephone and cable connections. However, installing underground power lines can be time-consuming and expensive, and they may not be suitable for areas prone to flooding or with many existing underground utilities. When considering underground power lines, it is essential to consult with a qualified electrician and obtain any necessary permits and approvals.

Benefits of underground power lines

Burying power lines underground has many benefits, although it is a costly and complex process. Firstly, it improves the aesthetics of the urban landscape, eliminating the visual clutter of overhead power lines and enhancing the sense of cleanliness and orderliness in the community. This can also increase property values.

Secondly, underground power lines are more reliable, as they are less susceptible to weather-related damage and accidents, reducing the risk of power outages. They are also less vulnerable to severe weather conditions and falling trees, ensuring sustained functionality. The lines are also safer, minimising the risk of accidents and injuries, as well as fires and electrocution.

Thirdly, underground power lines have minimal environmental impact, preserving natural aesthetics and green spaces, and reducing electromagnetic interference. This aligns with sustainability goals and benefits sensitive ecosystems and wildlife populations.

Finally, the improved reliability and safety of underground power lines can attract businesses and investors, stimulating economic growth in the region.

Hiring a Level 2 electrician

Underground power lines are safer than overhead wires as they provide better insulation against power surges and don't interfere with other utilities. However, the process of installing them is time-consuming and expensive. If you're considering switching to an underground power system, you should contact your local electrical utility provider for advice.

If you decide to switch to an underground power system, you will need to hire a Level 2 electrician. Level 2 electricians are highly qualified and accredited to perform complex and dangerous electrical work, including repairs, maintenance, and installations. They are authorised to work on overhead and underground electrical systems that link your home or business to the electricity supply network.

To become a Level 2 electrician, one must first be a licensed electrician and then undertake further intensive training. They are qualified to disconnect and reconnect properties to the power grid, as well as upgrade power systems to increase a property's output. They can also work on underground services, removing, replacing, and installing new underground power.

When hiring a Level 2 electrician, you can expect to pay more than you would for an ordinary electrician. In Australia, a regular electrician may charge between $60 and $100 an hour, whereas a Level 2 electrician may charge up to $120 an hour or more, depending on the complexity and danger level of the job.

When looking for a Level 2 electrician, it is important to be cautious of unqualified or inexperienced operators. Ensure that your electrician is fully certified and insured to carry out the work. You can find qualified Level 2 electricians through online services such as hipages, which can help you locate expert professionals in your area.

Registering underground electrical assets

Underground electrical systems have several benefits over traditional above-ground lines, including increased safety, security, reliability, and efficiency. They also do not interfere with other utilities such as telephone and cable connections. However, the process of installing underground cables can be time-consuming and expensive.

If you are considering installing underground electrical assets, it is important to be aware of the registration requirements. In some countries, such as Australia, there are laws in place that require the registration of underground electrical assets. For example, under the Electrical Safety Act 1998, United Energy is mandated to maintain a register of third-party electrical assets located on public property that are connected to their network.

To register your underground electrical assets, you may need to follow specific guidelines and provide detailed information. For instance, United Energy requires that the information be submitted in a compatible electronic PDF file format from an approved UE template. The Private Mains drawing needs to be on the approved UE template, with the Point of Supply and cable location clearly identified and detailed, and title block fields populated.

It is important to note that your installation may not be energised until the relevant authority or organisation is satisfied that all the requirements have been met and approval has been granted. In the case of United Energy, this includes incorporation into their third-party asset register and approval from a United Energy-approved officer.

Additionally, there are initiatives such as the National Underground Asset Register (NUAR) in the United Kingdom, which aims to improve the efficiency and safety of installing, maintaining, and repairing underground infrastructure. NUAR provides secure access to data from over 600 public and private sector asset owners, including gas, water, electric, and telecommunications companies, and local authorities. This allows planners and excavators to access the information they need to carry out their work effectively and safely.

Undergrounding goals and strategies

Undergrounding, or the conversion from overhead (aerial) to underground power distribution, is a strategy that utility companies are adopting to build the energy grid of the future. This strategy is particularly useful for areas prone to weather-related or vegetation-related outages. While undergrounding has historically been associated with high capital costs and complex policymaking, utility companies are now embracing it for its long-term benefits and overall cost savings over the electrical asset's lifespan.

Underground power lines have several benefits over traditional above-ground lines. They provide better insulation against power surges, don't interfere with other utilities like telephone and cable connections, and are safer as trees or debris cannot bring them down. Additionally, underground systems are less likely to be damaged by severe weather conditions and are more secure as they are not easily tampered with.

However, there are also some drawbacks to undergrounding. Problems with aerial power lines can be easily located and fixed, whereas underground lines are more difficult and expensive to repair. The presence of many underground utilities that need to be avoided during installation can also be a challenge. Furthermore, underlying topography may cause underground power lines to be very expensive, and areas prone to flooding may not be suitable for undergrounding.

To meet their undergrounding goals, electrical utility companies are incorporating unique conduit and cable installation methods. They are also pursuing decarbonization goals and implementing system hardening efforts to create more resilient and reliable networks in response to climate change. These efforts aim to reduce unplanned outages, maintain profitability, and satisfy customers.

Costs of underground power lines

The cost of installing underground power lines varies depending on several factors. The average cost to run power underground is $10 to $25 per foot, or $5,000 to $12,500 for 500' of new electrical lines. This is significantly more expensive than installing overhead power lines, which cost $5 to $15 per foot, or $4,000 to $7,500 for 500'. Running electrical lines underground can be 60% to 100%+ more costly than overhead lines due to the trenching involved.

The price of trenching labour ranges from $35 to $65 per hour, and trenching costs $5 to $12 per linear foot, or $500 to $1,200 on average to dig a 100-foot trench for underground conduit. The trench length, depth, soil type, and ground conditions all impact the cost. For example, hard or rocky soil requires more labour to trench than soft or sandy terrain, and tree trimming or removal may be necessary, costing $80 to $350 per tree.

Other costs to consider include the installation of a meter box ($500 to $2,100), electrical permits ($50 to $350), and the cost of a residential transformer ($3,000 to $20,000+), which may be required depending on the distance from the property.

A more affordable option is to install a half overground/half underground system, which involves running the line under your property and adding a private power pole. This option requires less excavation and installation, making it a more common choice.

It is important to note that the cost of underground power lines can vary depending on location and power company. Some utility companies may cover part of the installation cost or run the line for free up to a certain distance.

Frequently asked questions