Wood
Treated Southern Yellow Pine, Douglas Fir and other species, sized by ANSI O5.1 length and class. Climbable, drilled in the field, and the usual replacement for an existing wood pole. Wood utility poles guide
All guides
Guide
Types of utility poles: wood, steel, concrete and composite
The four main utility pole materials are treated wood, steel, spun concrete and composite, also called fiberglass or FRP (fiber-reinforced polymer). Wood is the most common and usually the lowest first cost. Steel, concrete and composite resist rot and insects and are estimated to last longer, but cost more up front. The right choice depends on load, site, hazards and budget.
The four utility pole materials
Each has its own guide. Start here to narrow the choice.
Steel
Tapered tubular poles, galvanized or weathering steel, set directly in the ground or bolted to a foundation. Utilities usually choose steel when they replace wood on transmission lines. Steel utility poles guide
Concrete
Prestressed poles. Spun-cast poles are spun in a mold, which makes them dense but hollow. Strong and resistant to rot, termites and fire, and the heaviest option. Concrete utility poles guide
Composite (fiberglass)
Glass fiber in a resin matrix. Light and low in conductivity; resists rot and corrosion and is immune to insects and woodpeckers. It can be drilled in the field like wood. Fiberglass utility poles guide
Wood vs steel vs concrete vs composite utility poles
General statements only. Products vary, so compare data sheets at the class and length you need.
| Material | Weight and handling | Typical uses | Strengths | Watch-outs | Typical standards |
|---|---|---|---|---|---|
| Wood | Moderate. Standard digger-derricks set most wood poles up to about 70 ft. | Most distribution and communication lines; H classes for heavier lines and transmission | Lowest first cost; climbable; easy to drill and modify; natural insulator | Decay, insects and woodpeckers; burns; needs inspection; treated wood disposal rules | ANSI O5.1; AWPA U1 and T1; RUS Bulletin 1728F-700 |
| Steel | Lighter than comparable wood: about half the weight in one 45 ft comparison cited by ORNL | Transmission; distribution poles bought as wood-class equivalents | Uniform engineered properties; no rot or insect damage; recyclable | Conducts electricity; corrosion at the groundline; harder to repair in the field | ASCE/SEI 48; ASTM A123 galvanizing |
| Concrete | Heaviest: nearly three times the wood pole in the same comparison | Transmission, distribution, streetlights and traffic signals | Strong; resists rot, termites, fire and ice | Hard to repair; corrosion of reinforcing steel is the typical failure; too heavy for some remote sites | ASTM C1089 (spun cast prestressed) |
| Composite (FRP) | Light; easier to handle at tight or remote sites | Distribution and some transmission; humid, coastal and wildfire-prone areas | Low conductivity; no rot or corrosion; immune to insects and woodpeckers; drillable in the field | Deflects more under load than steel or concrete; higher first cost; fire resistant, not fireproof | ANSI/ACMA FRP utility pole standard; ASCE MOP 104 |
Service life estimates differ by material. The Department of Energy's (DOE) 2024 resilience guide estimates average lives of about 80 years for steel and composite poles and about 60 for concrete. Wood is generally estimated at 30 to 50 years, with wide variation that depends on inspection and maintenance. The National Electrical Safety Code (NESC) applies the same trigger to wood and reinforced concrete: replace or rehabilitate a pole when deterioration cuts its strength to two-thirds of what was required at installation.
When each material makes sense
Coastal and hurricane areas
Salt air and humidity are hard on steel and wood. The first composite utility poles went up on Maui in the early 1960s, replacing wood that had decayed and steel that had corroded in warm, moist, salty air, according to Oak Ridge National Laboratory (ORNL). DOE notes that non-wood poles can withstand higher wind speeds; in Hurricane Irma, Duke Energy Florida had 27 wood transmission poles fail against one steel tower. Stronger wood is also an option: DOE says a higher-class wood pole improves storm performance at less cost than a non-wood pole.
Wildfire-prone areas
Wood burns. Southern California Edison (SCE) has used fire-resistant composite poles in its high fire risk areas; an engineering account of that program says SCE passed on steel because it is conductive and on concrete because it is too heavy for remote terrain. ORNL reports that recent experience shows concrete poles have a greater ability to survive wildfires. Composite does not support combustion, but its surface can char.
Hard-to-access sites
Weight decides what equipment can reach a site. DOE notes non-wood poles are lighter than wood, except concrete. Wood keeps one advantage off the road: a lineman can climb and work it with standard tools.
High loads and transmission
Wood runs up to Class H6, designed for 11,400 lb applied 2 ft from the top. When utilities replace wood on transmission lines, DOE says they usually choose steel and sometimes concrete. Steel transmission poles are designed under ASCE/SEI 48, on foundations from direct embedment to concrete caissons. ORNL notes composite poles are not widely used above 230 kV, possibly because they deflect more.
Budget-driven replacements
When first cost decides, wood usually wins. ORNL calls wood poles the least expensive up front, and DOE notes distribution utilities usually replace wood with wood. See what drives utility pole cost to compare the full job.
Mixing materials on one system
DOE notes that utilities use a wide range of pole materials and sizes, depending on location and how critical each pole is. The wood class system is the common reference. Snohomish County PUD's standard for steel and ductile iron poles, for example, maps each ANSI O5.1 wood class to an equivalent steel pole class with a required tip load. For composite, ASCE's Manual of Practice 104 reviews both strength and deflection equivalence with traditional materials.
Framing differs too. The North American Wood Pole Council notes that steel and concrete poles take smooth-sided guy attachments with machine bolts rather than lag bolts, and recommends added raptor protection on them because the pole can act as a ground path.
Standards to cite by material
- Wood: ANSI O5.1-2022 for species, quality, classes and dimensions; AWPA U1 and T1 for treatment; RUS Bulletin 1728F-700 for buyers financed by the USDA Rural Utilities Service.
- Steel: ASCE/SEI 48-19, Design of Steel Transmission Pole Structures. Utility specs such as the Grand River Dam Authority's call for hot-dip galvanizing to ASTM A123 or weathering steel, plus a coating on the buried section of directly embedded poles.
- Concrete: ASTM C1089 for spun cast prestressed poles, which bases acceptance on full-scale bending and torsion tests.
- Composite: the ANSI/ACMA specification for FRP composite utility poles, covering design, manufacturing, quality control, installation and inspection of directly embedded poles, and ASCE Manual of Practice 104 (second edition, 2019).
All four materials on Sourcewell Contract #060326-BIDR
Wood, galvanized steel, spun concrete and composite (FRP) poles are all on Sourcewell Contract #060326-BIDR, with crossarms, anchors, insulators and other hardware, and field services from delivery and installation to inspection, old pole removal and 24/7 storm response. Sourcewell's solicitation #11229 lists one awarded contract, BIDR Technologies, and the term runs through August 5, 2030.
Public agencies that register with Sourcewell, free and with no obligation to buy, can request a written quote at contract pricing with a delivery timeline, then issue a purchase order citing the contract number and their Sourcewell account number. Agencies remain responsible for their own due diligence. If you are weighing two materials, name both on the quote request.
Questions buyers ask
Which utility pole material lasts the longest?
DOE's 2024 resilience guide estimates average lives of about 80 years for steel and composite poles, about 60 for concrete, and generally 30 to 50 for wood. The wood figure varies widely with decay hazard, treatment and maintenance, and a regular inspection and remedial treatment program keeps wood poles in service longer.
Are steel and composite poles rated by the same classes as wood?
Steel and ductile iron poles can be bought as wood-class equivalents: Snohomish County PUD's standard, for example, maps each ANSI O5.1 class to a steel pole with a required tip load. For composite, ASCE's MOP 104 reviews strength and deflection equivalence, and deflection matters because composite poles bend more under load. Ask for the equivalent class and length on your quote.
Are concrete poles better than wood in storms?
Concrete is strong and resists rot, insects and fire, and DOE notes non-wood poles can withstand higher winds. It is also the heaviest option, hard to repair, and its reinforcing steel can corrode. DOE notes that utility hardening programs also strengthen wood lines with stronger classes, shorter spans and added guying. Match the choice to the site and the pole's role.
Can we buy different pole materials on one contract?
Yes. Sourcewell Contract #060326-BIDR covers wood, galvanized steel, spun concrete and composite poles, the hardware that goes with them, and field services. You can request a mixed order in one quote request and cite the contract number and your Sourcewell account number on the purchase order. Your agency still applies its own procurement rules.
Get contract pricing on any pole material
Send the length, class or equivalent class, material and site for each pole. You get a written quote at Sourcewell contract pricing with a delivery timeline.
Sources
- Utility Pole Maintenance and Upgrades: Resilience Investment Guide (September 2024), US Department of Energy, Grid Deployment Office
- Assessment of Commercial Composite Power Pole Performance, ORNL/TM-2021/2068, Oak Ridge National Laboratory, May 2021
- Composite Poles Stand Up to Gigafires (Char, O'Keefe and Fecht, June 16, 2022), T&D World
- Technical Bulletin 17-D-202: Wood Pole Design Considerations, North American Wood Pole Council
- National Wood Pole Standards (ASC O5 overview, Nelson G. Bingel III, ASC O5 Chairman), North American Wood Pole Council
- ASC O5 Standards, Accredited Standards Committee O5
- Standards and Specifications for Timber Products Acceptable for Use by RUS Borrowers (Bulletin 1728F-700), Federal Register, June 18, 2019
- New Guidance on Electrical Transmission Poles Offered in Updated ASCE Standard 48, Informed Infrastructure, May 6, 2020
- Specifications for Transmission Line Steel Poles, Monopole and H-Frame (September 16, 2025), Grand River Dam Authority
- Material Standard 5000170.1: Wood Class Equivalent Ductile Iron and Steel Utility Poles, Snohomish County PUD
- ASTM C1089-19, Standard Specification for Spun Cast Prestressed Concrete Poles, ASTM International
- ACMA releases standard specification for FRP composite utility poles, CompositesWorld, May 24, 2019
- New ASCE Manual of Practice Offers Best Practices for Use of Fiber-Reinforced Polymers for Utility Lines, Informed Infrastructure, December 10, 2019
- NESC Interpretation IR599, Rule 261 and Table 261-1 (2023 edition), IEEE
- Solicitation 11229: Utility Poles (awarded contracts), Sourcewell
- How cooperative purchasing works, Sourcewell
- Supply Catalog, BIDR Utilities