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Copper-to-Aluminium ROI Calculator: A 5-Step Spreadsheet for Cable Procurement Engineers
Every cable buyer in 2026 is asking the same question: "If I switch from copper to aluminium or CCA, exactly how much do I save — and is it worth the risk?"
The problem is most answers are hand-wavy: "about 40–60% cheaper" or "it depends on the application." That is not precise enough for a procurement decision that affects safety, installation cost, and multi-year reliability.
This guide gives you a 5-step, repeatable calculation method that takes 10 minutes with a spreadsheet. It works for any conductor material comparison: copper vs. aluminium, copper vs. CCA, or aluminium vs. CCA.
The 5 Variables You Need
Before you open a spreadsheet, gather these five inputs. Everything else is derived from them.
| # | Variable | Symbol | Where to Get It |
|---|---|---|---|
| 1 | Required current (A) | I | Load schedule or equipment nameplate |
| 2 | Cable run length (m) | L | Site layout drawing |
| 3 | Metal price ($/tonne) | P | LME (copper) / LME (aluminium) spot or monthly average |
| 4 | Minimum cross-section for target current (mm²) | A | IEC 60287 or manufacturer ampacity table |
| 5 | Density (g/cm³) | ρ | Cu = 8.9, Al = 2.7, CCA ≈ 4.5 (composite) |
Step 1: The Core Formula — Conductor Material Cost per Metre
Conductor cost ($/m) = A (mm²) × ρ (g/cm³) × P ($/t) × 10⁻⁶
This is the only formula you need for the raw material comparison. The ×10⁻⁶ converts the units: mm² × g/cm³ × $/t into $/m.
Pro Tip: A single cell in Excel
In your spreadsheet, write: =A_cell * density_cell * price_cell * 0.000001
That is the entire calculation. Everything else is just plugging in numbers for different materials and adding the insulation/accessory overhead.
Step 2: Worked Example — 100A Feeder, 500m Run
Let's run a real comparison for a 100A, 500-metre feeder at mid-2026 metal prices.
| Input | Pure Copper (T2) | Aluminium Alloy (AA-8000) | Copper-Clad Aluminium (CCA) |
|---|---|---|---|
| Required current (I) | 100 A | 100 A | 100 A |
| Min. cross-section for 100A | 25 mm² | 35 mm² | 45–50 mm²* |
| Density | 8.9 g/cm³ | 2.7 g/cm³ | ~4.5 g/cm³ |
| Metal price (May 2026) | $13,500/t | $2,500/t | $2,700/t* |
| Conductor cost per metre | $3.00/m | $0.24/m | $0.61/m |
| Conductor cost for 500m | $1,500 | $120 | $305 |
* CCA effective conductivity at 50/60 Hz: ~61% IACS (the skin depth of ~9 mm at mains frequency is far larger than the copper cladding thickness, so current distributes across the full composite cross-section). The equivalent CSA for matching 25 mm² Cu at 100A is 25 ÷ 0.61 ≈ 41 mm²; 45–50 mm² accounts for thermal margin and the next standard cable size.
** CCA composite price: thin Cu cladding (~15% by volume) + Al core, slightly above raw Al but well below pure Cu.
Raw Material Savings on Conductor Alone
Copper → Aluminium: $1,380 saved (92%)
Copper → CCA: $1,195 saved (80%)
On a single 500m feeder, the conductor material saving alone is enough to buy a small service vehicle. For a solar farm with 50 such feeders, the saving is $60,000–$69,000 on conductor material.
Step 3: Add the Insulation & Jacket Adjustment
The larger cross-section of Al/CCA means more insulation material is needed. The insulation cost scales roughly with the outer diameter, not the conductor area. Here is a rule of thumb based on typical XLPE/PVC cable constructions:
| Component | Copper (25 mm² baseline) | Aluminium (35 mm²) | CCA (50 mm²) |
|---|---|---|---|
| Conductor cost (per m) | $3.00 | $0.24 | $0.61 |
| Insulation + jacket overhead (per m)* | $0.40 | $0.55 | $0.75 |
| Total bare cable cost (per m) | $3.40 | $0.79 | $1.36 |
| vs. Copper baseline | 1.0× | 0.23× (77% saving) | 0.40× (60% saving) |
* Approximate: includes XLPE insulation, PVC sheath, and standard manufacturing margin for the insulating layers. Exact figures vary by manufacturer and certification requirements.
Step 4: The Hidden Second-Order Savings
The calculation above only covers the cable lying on the warehouse floor. The real TCO advantage of aluminium and CCA often comes from installation and structural savings that are invisible in a per-metre price comparison.
Weight-Driven Savings
The table below compares conductor-only weight first, then shows how that translates into savings for a complete 3-core cable (XLPE insulated, PVC sheathed, 0.6/1 kV) — the typical construction for a 100A feeder. The insulation and sheath add significant mass to both materials, so the complete-cable weight saving is smaller than the conductor-only percentage, but still meaningful in installation logistics.
| Line Item | Copper (3×25 mm²) | Aluminium (3×35 mm²) | How the Saving Works |
|---|---|---|---|
| Conductor-only weight per 500m | 3 × 111 kg = 334 kg | 3 × 47 kg = 142 kg | 58% lighter conductor → the core driver of all downstream savings |
| Complete 3-core cable weight per 500m (conductor + XLPE + PVC sheath) | ~900–1,100 kg | ~550–700 kg | ~30–35% lighter complete cable → lower shipping, lighter trays, easier pulling |
| Vertical riser labour (estimate) | 3-person team, 1 shift (with winch) | 2-person team, 1 shift | ~33% fewer labour hours — the weight gap matters most in high-rise pulls |
| Cable tray / ladder loading | Standard tray: 2–3 cables max | Standard tray: 4–5 cables | ~30–40% fewer tray runs → tray material + installation cost saving |
| Shipping cost (500m, full drum) | Baseline (~1,000 kg drum) | ~30% lower freight (drum weight ~650 kg) | Fits more cable per container, lower per-metre logistics cost |
Rule of Thumb: Weight Compounds
For every $1 saved on aluminium conductor material, expect an additional $0.15–0.30 in installation and logistics savings for typical building feeders. For high-rise vertical risers and offshore projects — where every kilogram adds rigging cost — this second-order saving can approach or exceed the material saving itself.
Step 5: Risk-Adjust Your Decision (The "Red Light" Check)
Even before your ROI spreadsheet, run this 3-question check. If any answer is "yes", stop and stay with copper — the TCO equation breaks down when the risk materialises.
| Question | If Yes → Red Light | Why Copper Wins |
|---|---|---|
| Does the cable flex repeatedly in service? | Drag chains, robot arms, EV charging cables | Aluminium fatigues 1.7× faster than copper under cyclic bending |
| Is space inside the termination enclosure critical? | EV battery packs, compact switchgear, charging guns | Aluminium needs 1.4–2× the conductor cross-section — it may not fit |
| Will the cable be installed in a fire-critical circuit? | BS 6387 CWZ, emergency lighting, fire pumps | Copper maintains circuit integrity at higher temperatures; Aluminium softens sooner |
The Complete TCO Spreadsheet Template
Here is the final template. Copy this structure into your spreadsheet, fill in your project numbers, and get a custom ROI in 10 minutes.
| Row | Item | Copper | Aluminium | CCA |
|---|---|---|---|---|
| 1 | Design current (A) | Enter your value | ||
| 2 | Required CSA (mm²) | |||
| 3 | Run length (m) | Enter your value | ||
| 4 | Metal price ($/t) | |||
| 5 | Conductor cost ($/m) = A × density × P × 1e-6 | |||
| 6 | Insulation overhead ($/m) | |||
| 7 | Total cable cost ($/m) | |||
| 8 | Total cable cost (full run) | |||
| 9 | Material saving vs. copper ($) | — | ||
| 10 | Labour/installation saving (est.) | — | = Row 9 × 0.25 | |
| 11 | TOTAL PROJECT SAVING | — | = Row 9 + Row 10 | |
Important: Accessory Costs
If you select aluminium, add $15–40 per termination for bi-metal lugs and anti-oxidation compound. For CCA, standard copper lugs work (the outer copper layer is solderable and crimp-compatible), so the termination cost adder is negligible. Include these in Row 10 if applicable.
When the ROI Model Says "Yes, But..." — A Decision Flow
A positive number in Row 11 is not the final answer. Run this quick decision tree:
- Is this a new installation? → If yes, proceed with Al/CCA if ROI ≥ 30%. If retrofitting an existing circuit, skip to step 2.
- Are the existing terminations copper-rated? → If yes, and you are replacing copper with Al, you must also replace all terminals with bi-metal types. Budget for this.
- Is the cable exposed to weather or condensation? → If yes, CCA's outer copper layer provides better corrosion resistance than bare aluminium. Prefer CCA over Al for outdoor installations.
- Is this a dynamic flexing circuit? → If yes, the spreadsheet answer is irrelevant. Stay on copper regardless of the price.
Conclusion: A Tool, Not a Verdict
This 5-step calculation method does not tell you whether aluminium or CCA is "better" than copper. It gives you a repeatable, auditable, per-project ROI number that you can present to your project manager — or to your client's engineer — with confidence.
The two questions this spreadsheet answers are:
- "Exactly how much will I save on this specific project?" — not a percentage, but a dollar figure.
- "Is the saving worth the additional engineering precautions?" — the answer depends on your risk tolerance and application.
Run the numbers. If the saving is marginal (under 20%), stay with copper — the familiarity and termination simplicity are worth more. If the saving is substantial (40%+), the engineering effort to switch is almost certainly justified.
Need a Spreadsheet Template? We'll Send It to You.
SORIVO provides a pre-built Copper-to-Al ROI Calculator (.xlsx) with built-in ampacity tables for common cable types — just enter your load and run length.
Email: sale@sorivocable.com | Phone: +86 19282905529
Our engineers can also run the calculation for your specific project — free of charge — and recommend the optimal material + accessory combination.
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