Utility poles support the overhead lines and equipment that power our daily lives. The materials a power company chooses for these poles can significantly impact a utility’s longevity, safety, and environmental footprint. Selecting the most suitable material for utility poles is a decision that requires careful consideration of several factors. Here are a few guidelines for choosing utility pole material.
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Utility poles consist of several material types to meet various geographical needs and circumstances. Wood, steel, and concrete are the three primary options, each with its own set of advantages and considerations.
Wood is a traditional go-to material for utility poles, offering easy customization. While they aren’t as resilient as other materials, treated wood poles still provide some resistance to the elements.
Utility poles commonly consist of two types of metal: steel and iron. Steel provides exceptional structural strength and is common in areas sporting high winds or corrosive environments. Many also favor it for its durability, making it a cost-effective option in the long term.
Ductile iron combines strength and flexibility and is ideal for utility poles. Its durability against natural forces ensures structural integrity, reliability, and safety, exceeding traditional materials. These poles excel in environmental sustainability and have long lifespans, providing a responsible choice for utility infrastructure.
Concrete poles are known for their high resistance to fire and pests, making them an ideal choice in areas prone to inclement weather or conditions prime for wildfires. They are less prone to rot and decay, ensuring a long lifespan. However, they are difficult to transport and work with due to their weight.
The material you choose for utility poles can directly impact the environment. Wooden poles, for instance, are renewable and offer a lower carbon footprint during production. Steel and iron, while more durable, have higher initial environmental impacts when considering energy use and emissions during manufacturing. However, due to the metallic poles’ durability and longevity, they last much longer than wooden poles, requiring fewer replacements. Ductile iron poles are made from recycled material and are recyclable at the end of life, which minimizes the resources needed for future installations.
Understanding a location’s specific needs and conditions is critical for utility pole choice. Humid areas may not favor wood, as moisture can lead to decomposition, while corrosive environments could diminish the lifespan of steel. Areas that often experience storms, whether hurricanes, tornadoes or straight line winds are great locations for premium poles such as steel or ductile iron. Wildfire-prone areas need fire-resistant materials such as metallic poles as well. Other environmental impacts on wood poles include woodpeckers and insects which can lead to premature pole replacements.
Cost is a primary factor in any infrastructure investment. Wood poles are typically the least expensive upfront, making them attractive for budget-strapped projects. However, they may require more frequent replacement over time, which could offset their initial cost advantage.
Premium materials such as metallic poles come with higher initial costs but require less maintenance and have longer lifespans.
Critical structures that are used to support expensive equipment, such as switches or reclosers and sub-station exit poles, are also areas where a utility needs to make key decisions on pole materials. The more risk associated with a pole failure, the more a utility needs to utilize a premium material to help mitigate the risk.
Utility poles provide electrical power throughout the world. They're an important element of our electrical system but they're also a big part of the North American experience.
Anyone who has taken a journey across North America has spent time watching the roadside poles go by. Many pole materials go into the building of this backbone of our electricity and power. Choosing the right option for your project and utility company is an important first step of the journey.
Each option for material offers its own advantages and disadvantages. The easiest way to decide on a particular choice is to arm yourself with the knowledge needed to tackle it. None of these options are inherently better or worse than the others–it simply comes down to what you need.
With that in mind, this article will inform on the three main choices for utility poles, which are wood, steel, and concrete utility poles. We’ll give a brief overview of each option along with use-cases that typically benefit from them.
Wooden poles are among the most common choices for utility poles. Wooden utility poles utilize many different forms of wood. Southern Pine, Western Red Cedar, and Douglas Fir are among the most common options. After cutting the trees down, companies will go about “seasoning” them.
This seasoning process involves drying out the trees. After this, wooden poles are preserved treated with Chromated Copper Arsenate (CCA.) This chemical is a wood preservative for its ability to reduce wood rot and termite damage. While this treatment is effective, it’s not a guarantee that these issues won’t still take place.
Perhaps more troubling than that, CCA isnot a safe chemical to expose to the environment. As the name implies, the use of this endangers the risk ofArsenic poisoning as well as other potential issues. Even if treated well with these hazardous chemicals, these poles will eventually rot and fall into disrepair.
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There are many positives to wooden poles, however. For starters, they’re much cheaper. Wooden poles are by far the most cost-effective choice for utility poles for this reason. All poles will require replacement or maintenance at some point. With wooden poles, these fixes will be more frequent but far less expensive.
Wooden utility poles are great for dry areas where they will undergo little degradation. They are also a common choice for roadside areas. This is partly because they pose less of a risk in the event of an auto accident.
Wooden poles are easily created so they are also a better option in instances that require many poles at once. Though they may not last as long, on the whole, they’re easier to get and that offers other advantages.
As mentioned, their greatest advantage is in their cost-effectiveness. Any need where costs are a factor may benefit from wooden options for their utility poles. Not only is the material less expensive, but they are also cheaper to ship.
Wood represents a readily available, low-cost option for anyone needing a utility pole. Wood is also a natural insulator.
Steel poles make for a strong, fire-resistant option. They are longer-lasting and resistant to termites, fire, and rot. There is still some debate on whether steel or wooden poles are better for the environment.
On paper, the emissions created by steel poles are harsher for the environment. Though they have a longer service life, the resources needed for them are environmentally costly. That said, some studies show steel to be a better option forextended periods of 40 years.
The study found steel to use less oil, affect less wildlife, and disturb less of their environment than wooden poles. The greater durability of steel sets it up as an attractive alternative to wood. With easy installation and superior strength, it’s no wonder many go with this option.
Another benefit to the steel pole option is that they don’t require treatment with harsh chemicals. The chemicals used to treat wooden poles are not necessary for these.
Steel poles carry several advantages but that doesn’t mean that they are the right choice for every scenario. Steel poles are often galvanized to prevent rust but their ability to do so still presents problems in salt-water scenarios. Steel poles are not a great option for placement near the ocean or in areas with a frequent practice of salting for snow.
Steel poles are roughly30% lighter than their wooden counterparts. This makes them easier to transport long distances or to deal with in larger quantities. Hard to reach areas can benefit from the easier ability to get the pole in place. After, it's also easier to replace it when the time comes.
Concrete and steel concrete poles represent the most long-term solution there is. More durable than the other options, concrete poles are sturdy and will likely have the longest lifespan. Concrete carries many of the same advantages as steel poles along with a few of its own.
Like steel utility poles, concrete will be termite and fire-resistant. Likewise, there is no concern about rot. The biggest reason people choose concrete is the desire for the strongest possible choice. While this is understandable, there are a lot of considerations with concrete utility poles.
For starters, they are very expensive. Concrete poles are bound to cost much more than steel or utility options. Not only in their production (which, itself, is quite pricey,) but also in their transportation. Concrete utility poles are exorbitant heavy. As such, they require special consideration in travel.
In addition to this, they are very harmful to the environment. Easily the worst option environmentally, concrete utility poles need massive amounts of energy.
That isn’t to say that there aren't times when this option is appropriate! Concrete poles are great for areas prone to heavy weather. Seaside towns where water corrodes metal and wood alike can also benefit from a concrete option. They may be the most expensive option but that isn’t to say that there isn’t a time that the price is worth it!
Choosing the material of your utility pole can be difficult. All three of the above options have pros and cons. The decision often comes down to the specific needs that you have for your project. Are you looking for something affordable and easily available? Are you willing to wait or pay extra for something that will last longer? Where are you placing these and how long would you like for them to last?
These questions and more can steer your decision one way or the other. No option is perfect for everyone. Whatever material you choose for your utility poles, the next step will be receiving them. That’s where the team atBlackwood Resources comes in!
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