# GOES Electrical Steel Economics: Yield, Loss and Grade Premium in 2026

> Cost a finished core using yield and scrap credit, then set the maximum acceptable grade premium from verified no-load loss savings.

- **Category:** Material Costs & Procurement
- **Author:** Voltformer Energy Analysis
- **Publication date:** 2026-10-07
- **Reading time:** 8 min read
- **Key topics:** GOES, Core yield, No-load loss
- **Body language:** en
- **URL:** https://voltformer.com/articles/electrical-steel-goes-yield-loss-premium-transformer-cost-2026

![AI-generated editorial artwork: Copper and aluminium conductor coils beside stacked electrical steel laminations](https://voltformer.com/article-images/energy-economics-materials-2026.webp)

AI-generated editorial illustration; it does not depict a verified project, actual prices or chart data.

### 1. The procurement decision

A GOES purchase should be judged by the accepted core and its guaranteed electrical loss, not by a generic steel price. The buyer has two independent levers: reduce discarded sheet at a fixed grade, or pay for a grade that reduces assembled no-load loss. They require different evidence and different cost comparisons. Better nesting is useful only if the resulting laminations still meet dimensional and grain-direction requirements. A premium grade is useful only if its magnetic advantage survives cutting, handling and the specified thermal process. Keeping these questions separate prevents a yield improvement from being credited as an electrical-efficiency improvement.

### 2. August–early October evidence and price basis

As of 7 October 2026, a full October material average is unavailable. The [2 October World Bank Pink Sheet](https://thedocs.worldbank.org/en/doc/74e8be41ceb20fa0da750cda2f6b9e4e-0050012026/related/CMO-Pink-Sheet-October-2026.pdf) gives iron ore at 96.3 USD/dry metric tonne in August and 97.7 in September. That is a 62% Fe CFR China ore reference, not a quote for GOES with a specific thickness, coating and magnetic guarantee. Its movement cannot price a transformer core. Obtain dated August and September offers for the same accepted grade if the procurement decision requires a product-price trend. Without them the defensible analysis is the explicit hypothetical yield and premium model below.

### 3. Worked cost model

[JFE's technical description](https://www.jfe-steel.co.jp/en/products/electrical/product/g_core.php) differentiates grain-oriented grades and domain-refining treatments; the required processing route matters. A heat-resistant treatment and a non-heat-resistant treatment are not interchangeable through every annealing operation. Require the exact thickness, coating, rolling-direction convention, magnetic test condition and guaranteed finished-core loss. A mill strip loss value is not automatically the assembled transformer no-load loss. The [DOE supply-chain resources](https://www.energy.gov/oe/supply-chain-resources) establish transformer supply-chain relevance, but do not provide this project's GOES price. No verified public August or September 2026 GOES sheet quotation is claimed here; iron ore is not a finished electrical-steel proxy.

Assume a hypothetical finished core of 10 t, a sheet quotation of 3000 USD/t and a scrap credit of 300 USD/t. These are scenario inputs, not reported prices. With 90% usable yield, gross input is 10/0.90 = 11.1111 t and scrap is 1.1111 t. Net material cost is 11.1111 × 3000 − 1.1111 × 300 = 33000 USD. Cutting, stacking, annealing, handling and testing are excluded so the yield mechanism remains visible. Yield means acceptable finished mass divided by purchased sheet mass; a different factory definition cannot be inserted without reconciliation.

For a premium grade, suppose verified assembled loss improves by 0.5 kW. At 8760 energized hours/year and 0.10 USD/kWh, annual savings are 0.5 × 8760 × 0.10 = 438 USD/year. A 10-year horizon at a hypothetical 8% discount rate has annuity factor 6.7100814, giving about 2939 USD present value. This is the maximum additional installed cost supported by these energy savings alone, not a guaranteed saving or full lifetime valuation.

### 4. Sensitivity and decision trigger

At 85%, 90% and 95% yield, the same core needs 11.7647, 11.1111 and 10.5263 t of sheet. Using the same quotation and scrap credit gives net material costs 34764.71, 33000 and 31421.05 USD/core. Higher yield reduces purchased material and the scrap credit simultaneously; counting only the gross reduction overstates savings. Moving from 90% to 95% saves 1578.95 USD before any additional tooling or labour.

Use the chart to decide whether nesting, standardized widths or cutting upgrades merit a quotation. Keep grade and guaranteed loss identical in a yield comparison. Separately compare the premium-grade installed price against the 2939 USD energy allowance. If energized hours or tariff fall, that allowance falls; if a processing step removes domain refinement, the assumed 0.5 kW improvement needs new evidence.

![Net core material cost versus usable yield](https://voltformer.com/article-charts/electrical-steel-goes-yield-loss-premium-transformer-cost-2026-en.svg)

Illustrative 10 t finished core; sheet 3000 USD/t and scrap credit 300 USD/t. Costs use gross input and scrap quantity at each yield; exclude core processing and are not GOES market observations.

| Scenario | Input basis | Cost result |
|---|---|---:|
| 85% yield | 85% yield | 34764.71 USD |
| 90% yield | 90% yield | 33000 USD |
| 95% yield | 95% yield | 31421.05 USD |

### 5. Contract evidence and implementation

Require mill certificates, thickness and width tolerances, coating compatibility, rolling orientation and the permitted stress-relief process. Reconcile sheet mass received, accepted laminations, recoverable scrap and rejected output across one batch. State who owns scrap and whether its credit is gross or net of handling. For the loss premium, ask for the same assembled design at the same test voltage and frequency, rather than comparing unmatched strip samples. The purchase order should state which guaranteed loss and manufacturing route are accepted. If the supplier changes domain treatment or processing, reopen both the loss guarantee and commercial premium before shipment.

### 6. Operating cost and accounting boundary

The material calculation is nominal USD/core, excluding tax, freight, cutting labour, tooling and financing. A separately priced cutting upgrade must be deducted from yield savings before claiming a business case. The loss valuation is discounted nominal USD with fixed tariff assumptions; it excludes inflation, energy-price escalation and residual value. No-load loss occurs while energized, including lightly loaded periods. Use actual annual energized hours rather than automatically assigning 8760 to a seasonal or standby transformer. Higher performance can have value beyond electricity, but noise, space and thermal benefits require their own measurable design evidence and must not be counted twice.

### 7. Frequently asked questions

**Can iron ore index GOES?** Not automatically; a supplier contract may define a linkage, but it is not a product-price equivalence.

**Does higher material yield lower no-load loss?** Not necessarily. Yield is purchased-mass efficiency; magnetic loss depends on material and finished construction.

**What caps an acceptable premium?** The documented present value of the benefits included in the owner's comparison. The worked 2939 USD allowance covers only the stated energy saving, not a universal premium.

Continue with the [transformer procurement cost bridge](https://voltformer.com/articles/transformer-procurement-copper-aluminium-oil-fx-cost-bridge-2026), [transformer loss valuation](https://voltformer.com/articles/transformer-losses-capex-npv-electricity-cost-2026) and [ROI calculator](https://voltformer.com/roi-calculator).

### 8. References

- [World Bank Commodity Markets](https://thedocs.worldbank.org/en/doc/74e8be41ceb20fa0da750cda2f6b9e4e-0050012026/related/CMO-Pink-Sheet-October-2026.pdf)
- [JFE G-CORE technical specification](https://www.jfe-steel.co.jp/en/products/electrical/product/g_core.php)
- [US DOE Supply Chain Resources](https://www.energy.gov/oe/supply-chain-resources)
- [IEA Global Critical Minerals Outlook 2026](https://www.iea.org/reports/global-critical-minerals-outlook-2026)

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