The Pressure to Deliver More with Less
As utilities confront rising demand for grid capacity, the challenge of delivering new transmission infrastructure efficiently and affordably has become more urgent than ever. With evolving regulations, growing renewable generation, and increasing electrification, traditional design choices are being re-evaluated. One of the most direct ways to reduce capital expenditures – without sacrificing performance – is by rethinking the conductor.
Among the most impactful solutions available today is the ACCC® Conductor. By combining a high-strength, lightweight composite core with greater aluminum content than legacy designs like ACSR and ACSS, ACCC® Conductor provides substantial cost savings in transmission projects – especially when measured through the lens of structural efficiency and material optimization.
A Case Study in Cost Reduction: 20-Mile, 230 kV Transmission Line
One of the most substantial contributors to upfront capital savings comes from the reduction in structure count enabled by ACCC® Conductor’s mechanical advantages. According to MISO’s cost guidelines for 230 kV steel pole single-circuit structures, a 20-mile ACSR-based line would typically require approximately 320 structures. This includes a representative mix of 240 tangent structures, 40 running angle structures, and 20 each of non-angled and angled dead-ends.
Each structure type carries a distinct cost profile – ranging from around $70,000 for a tangent structure to well over $160,000 for an angled dead-end – once foundation, hardware, labor, and installation are included. These expenses account for the majority of the total installed cost, driving the ACSR structure budget to over $39.6 million.
By leveraging the ACCC® Conductor’s higher tensile strength and reduced thermal sag, utilities can reduce the number of structures by about 15%, enabling longer spans (averaging 350 feet or more) and improving routing flexibility. This design improvement eliminates nearly 50 structures from the project, yielding a structural savings of more than $5.9 million. These savings reflect not just the material costs avoided, but also reductions in excavation, foundation preparation, crane usage, hardware, and assembly labor.
Additionally, fewer structures simplify permitting, reduce environmental disturbance, and streamline construction logistics – making the ACCC® Conductor an especially attractive option in challenging terrain or sensitive corridors.
Consider a standard 20-mile, 230 kV transmission line. Using legacy ACSR Drake, utilities would typically install around 320 structures, including tangents, running angles, and dead-ends. Each structure type carries significant costs when factoring in material, installation, hardware, and foundations. The total estimated cost for structure-related work in this scenario exceeds $39.6 million.
By switching to ACCC® Drake, utilities can reduce structure counts by about 15%, thanks to the conductor’s superior tensile strength and reduced thermal sag. This allows for longer spans – an estimated average of 350 feet versus shorter ruling spans with ACSR. Fewer poles mean fewer foundations, less labor, and lower hardware requirements. The result? A structural cost reduction of more than $5.9 million, bringing the total down to approximately $33.7 million.
Conductor Cost Tradeoff and Net Savings
When the total installed cost of the project is considered, the ACSR design reaches $40.9 million compared to just $35.8 million for the ACCC® Conductor version. But the capital efficiency becomes even more compelling when viewed through the lens of performance. The ACSR line supports 359 MVA of capacity, while the ACCC® Conductor Line can carry up to 717 MVA – nearly double. On a cost-per-MVA basis, the ACSR line equates to approximately $114,000 per MVA, while the ACCC® Conductor System delivers a far more economical $50,000 per MVA. This stark difference underscores ACCC® Conductor’s ability to deliver not only absolute cost savings but also superior value per unit of capacity.
The Added Value of Performance: While ACSS (Aluminum Conductor Steel Supported) conductors are often cited for their ability to carry higher current loads than standard ACSR due to their capacity to operate at elevated temperatures – up to 250°C – there are notable drawbacks that diminish their appeal from a capital and structural cost perspective.
At these high operating temperatures, ACSS conductors experience significantly more thermal sag due to the expansion of their steel core. This increase in sag often necessitates the use of taller structures or shorter span lengths to maintain clearance requirements, both of which contribute to higher overall construction costs. Without mitigating these structural constraints, the increased ampacity potential of ACSS may go unrealized, as the system will be limited by mechanical and clearance constraints before it reaches its thermal rating.
Additionally, line losses increase substantially as conductor temperature rises. Higher resistance at elevated temperatures results in more energy dissipated as heat, lowering system efficiency and increasing operational costs over time. These factors, while manageable in some retrofit scenarios, present real trade-offs when considered for new line construction.
In contrast, ACCC® Conductors utilize a composite core with a much lower coefficient of thermal expansion. This means they can operate continuously at 180°C with far less sag than ACSS or ACSR, making them ideally suited for longer spans, fewer and shorter structures, and reduced capital investment. Their larger aluminum content also keeps electrical resistance lower—even under high-load conditions – resulting in much lower line losses.
Design with the Future in Mind: For transmission planners and engineers, the capital savings from ACCC® Conductor are substantial and quantifiable. But when layered with performance, efficiency, and system resilience, the long-term value proposition becomes even more compelling. As utilities seek to build smarter, more adaptable infrastructure, ACCC® Conductor offers a pathway to reduce upfront spending while future-proofing the grid.
Incorporating these added benefits into the early design process ensures utilities capture not only the immediate budget advantages but also the strategic performance gains necessary for tomorrow’s energy demands. When every dollar counts and every decision matters, ACCC® Conductor stands out as the conductor of choice.
If You’d Like Help CTC Global has already supported the successful completion of more than 1,350 projects in 68 countries. The Company’s team of Application Engineers use PLS CADD™ and CTC Global’s CCP™ design software that can help you assess any project challenges you might be facing. Backed by more than 35 authorized ACCC® Conductor Manufacturers and nearly 100 ACCC® Conductor Master Installers, the Company stands ready to help you succeed. For more information, please contact us today. info@ctcglobal.com
