The Tool Desk
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There is no universal percentage budget for a “typical” fab. Process technology, wafer size, product mix, factory scale, location, utility prices, wages, environmental rules, reporting period and the definition of “operating cost” all change the result. The most useful comparison is therefore cost per wafer or good die on a clearly defined accounting basis, not an unqualified industry average.
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First define what “running cost” includes
Two estimates can both be accurate and still be incomparable if they use different cost boundaries. Before examining a number, identify whether it covers:
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- Production operating expense: facility expense plus process materials, operators, technicians, engineering support, consumables and maintenance.
- Full production cost: operating expense plus depreciation, equipment ownership charges, capital financing or allocated corporate overhead.
Output also needs a definition. “Cost per wafer start” counts a wafer entering the process; “cost per completed wafer” counts one that has finished processing; “cost per good die” additionally accounts for yield losses. A fab with the same monthly wafer starts can have a very different cost per good die if its process yield differs.
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The International Technology Roadmap for Semiconductors (ITRS) Factory Integration roadmap (2003) frames factory productivity and utility costs around the manufacturing system rather than a single bill. The European Commission staff working document CELEX 52026SC0504 likewise separates technology, scale, utilization, labour, energy and environmental factors. Those distinctions are essential when comparing a company filing, a regional study and a historical facility budget.
Fixed costs create the utilization problem
Buildings, cleanrooms and process equipment
A fab needs cleanroom space, air-handling and cooling infrastructure, chemical and gas distribution, ultrapure-water systems, waste treatment and hundreds of process tools. Much of that capacity is committed before the next wafer is made. Depreciation or other ownership charges, facility staffing and repair capability continue during a production slowdown.
An SEC-filed annual report from RF Micro Devices (2012) describes semiconductor manufacturing facilities as having fixed costs associated with plant and equipment, labour, and repair and maintenance. Its stated mechanism is straightforward: higher utilization can improve financial performance because fixed costs are allocated across more output. If usable capacity falls while the cost base remains, fixed cost per wafer rises.
Why utilization is not simply “machines switched on”
Nominal capacity can overstate practical capacity. A tool may be unavailable for preventive maintenance, constrained by a bottleneck step, or unsuitable for a particular product. Demand may also be insufficient to use every qualified line. Consequently, a high percentage of installed capacity does not automatically mean a low cost per good wafer; the capacity must be usable for the product mix and produce acceptable yield.
The European Commission’s 2026 staff working document reports that utilization above 75% is typically important to favourable semiconductor-industry economics and that large-scale operations can reduce fab costs. That is an observation in that regional industry analysis, not a universal break-even point for every node, wafer size or business model. A specialty or mature-node fab may have a different economic optimum from a leading-edge facility.
Materials and consumables rise with process complexity
Every wafer consumes materials as it moves through hundreds of controlled steps. The recurring categories include silicon wafers, specialty gases, photoresists and other process chemicals, metals, cleaning materials, filters and disposable components. The European Commission identifies specialty gases, chemicals, metals and other production materials as a major cost item.
Advanced processes generally use more complicated recipes, tighter contamination control and additional patterning or deposition steps. That does not mean every advanced wafer has the same material bill: product design, number of layers, wafer diameter and the amount of rework all matter. Waste, reclaim programs and the treatment required for spent chemicals affect the net cost rather than appearing only as a purchasing line.
Consumables can also be constrained by supply and qualification requirements. A substitute chemical or gas may require process requalification, so the lowest quoted purchase price is not necessarily the lowest manufacturing cost once downtime and engineering work are included.
Utilities extend far beyond the electric meter
Electricity for tools and the sub-fab
Electricity powers process tools and their support systems, not just the visible equipment on the cleanroom floor. SEMI’s article “Being ‘Idle’ to Make Money: How Powering Down Pays Off,” dated March 27, 2018, highlights process tools and sub-fab equipment such as vacuum pumps and abatement systems, as well as HVAC and cooling, as major loads. These systems can keep drawing power while a tool is waiting for production.
Idle-energy controls can therefore affect operating expense without changing wafer recipes. The same SEMI article reports more than €4.3 million in annual savings in an AIS Automation model for implementing energy-saving modes. That is modeled potential, not a measured result that applies to every factory; safe shutdown and restart limits, product queue time and contamination risk determine what a particular fab can actually save.
Water and ultrapure-water production
Fabs use water to make ultrapure water (UPW) for wafer cleaning and to support facility systems. Producing UPW requires treatment, pumping, monitoring and distribution. Water leaving the process may contain chemicals or metals and cannot simply be discharged untreated.
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Gases, chemicals, central plant and waste treatment
Gas farms, chemical delivery, central utility plants, wastewater treatment and hazardous-waste handling are operating systems in their own right. The 2003 ITRS roadmap defines utility cost broadly as power, water, gases and chemicals needed for manufacturing, including factory materials and consumables. The National Academy of Engineering and National Research Council’s 1999 report, Industrial Environmental Performance Metrics: Challenges and Opportunities, lists power, water, gases, chemicals, central plant services and waste-related functions separately in its historical facility example.
Environmental obligations can add both direct treatment expense and maintenance requirements for abatement equipment. Local discharge permits, emissions rules and waste classifications change the required systems, so a facility in one region cannot be assigned another region’s utility ratio without adjustment.
Labour, maintenance and productivity are location-sensitive
People who operate and support the fab
Staffing includes production operators, process and equipment engineers, technicians, facilities specialists, quality personnel and managers. Labour cost includes wages, benefits, employer contributions, overtime, training and, in some cases, vendor technicians. A plant with expensive equipment but insufficient skilled staff may lose more through downtime and slow troubleshooting than it saves in payroll.
The European Commission’s regional analysis discusses differences in wages, productivity, employer contributions and maintenance expense. Those comparisons describe the regions examined in that document; they should not be generalized to every country or fab type. Local labour availability also affects how much work must be covered by contractors or overtime.
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Maintenance and spare parts
Preventive maintenance consumes technician time, replacement parts, utilities and scheduled tool capacity. Corrective maintenance adds unplanned downtime and can disrupt the bottleneck step that limits factory output. Repair and maintenance are part of the fixed-cost base identified in the 2012 SEC filing, but the variable portion—parts, specialist support and extra shifts—can rise with tool age, utilization and process complexity.
Yield determines the cost of saleable output
Yield is the link between factory spending and revenue-generating product. A wafer that fails inspection after consuming process time, chemicals, energy and tool capacity still incurred most of its manufacturing cost. The same is true of a wafer that passes some steps but is scrapped later.
A simple way to express the relationship is:
Cost per good wafer (or good die) = total manufacturing cost ÷ saleable output.
The denominator must reflect actual good output, not just starts. Two fabs with identical utility bills and wafer starts can therefore report different costs per good die because of defect density, rework, process maturity or product design. The cited ITRS and National Academies material emphasizes factory productivity and cost per unit of silicon but does not establish a current universal numerical yield penalty; no single percentage should be assumed.
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Process node and number of steps
A leading-edge logic process may require more lithography, deposition, etch, metrology and cleaning operations than a mature process. Memory, analog, power and specialty devices use different flows and tool sets. The relevant comparison is therefore the complete process recipe and its cycle time, not a node label alone.
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Wafer diameter and factory scale
Larger wafers can produce more die per processed wafer, but they also require compatible tools, handling and cleanroom infrastructure. The European Commission reports that large-scale operations can reduce fab costs, reflecting economies in shared utilities, engineering and purchasing. Scale does not guarantee a lower unit cost if the line is underfilled or if a large facility carries unused capacity.
Location and utility tariffs
Electricity and water prices, reliability requirements, land and infrastructure, wages, taxes, environmental controls and supplier distance all vary by location. The European Commission’s updated 2025 comparison reports EU electricity prices 137% above US levels in the comparison it presents. That is a regional snapshot that can change with market conditions, tariff structure and the exact customer class; it is not a universal surcharge for every European fab.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What published figures can—and cannot—tell you
Historical figures are useful for showing scale and cost categories, but they should not be presented as current averages.
| Figure | What it describes | How to interpret it |
|---|---|---|
| 41.5% electricity; 28.7% salary and benefits | Entries in the National Academy of Engineering and National Research Council’s 1999 “Operating Expenses of a Typical Semiconductor Facility” table, based on a historical source credited there as Allenby (forthcoming). | Historical table entries, not current universal fab shares. The table’s scope and date must accompany the percentages. |
| 25–40% of a facility operating budget for the electric bill | 1999 report citing the Semiconductor Industry Association (1997). | Historical facility-budget statement that explicitly excludes capital and construction expenditures. |
| Up to $25 million a year in utility bills; electricity up to 30% of operating costs | SEMI article, March 27, 2018, attributing the figures to earlier sources and noting location and local rates. | Illustrative industry statement for oversize fabs, not a current quotation for a named plant. |
| More than €4.3 million in annual savings | AIS Automation modeling reported by SEMI in 2018 for energy-saving-mode implementation. | Modeled potential, not a measured result that every fab will achieve. |
| Utilization above 75% | Industry observation in the European Commission’s 2026 staff working document. | Regional/industry context, not a universal threshold or guaranteed break-even level. |
| EU electricity prices 137% above US levels | Updated 2025 regional comparison reported in the European Commission document. | A time- and geography-specific comparison that changes with market conditions. |
How to compare two fabs or cost estimates
- Set the cost boundary. State whether the number is operating expense only, facility expense, or full production cost including depreciation, capital charges and allocated overhead.
- Use the same output basis. Compare wafer starts with wafer starts, completed wafers with completed wafers, or good dies with good dies. Do not divide one fab’s expense by starts and another’s by good output.
- Match technology and product mix. Record process node, wafer diameter, number and type of process steps, product complexity and any special materials.
- Record utilization and yield. Include practical capacity in use, bottleneck constraints, rework and the share of output meeting specifications.
- Normalize location and scale. Account for electricity and water tariffs, labour rates, infrastructure, environmental requirements, supplier logistics and facility size.
- Align the period and accounting. Identify the reporting year and treatment of depreciation, subsidies, shared corporate services and unusual energy prices.
Only after these fields match does a difference in cost per wafer indicate a meaningful operational advantage. Otherwise, it may simply reflect accounting scope, regional prices or a different mix of products.
Where operators can influence the bill
- Raise productive utilization: keep qualified bottleneck tools supplied with demand while avoiding production that cannot be sold. Higher utilization spreads fixed costs only when the output is usable and yields acceptable product.
- Improve yield: defect prevention and faster root-cause correction increase good output without proportionally increasing the fixed cost base.
- Control idle energy: use validated energy-saving modes for tools and sub-fab systems when queue time and restart requirements permit, with contamination and safety controls intact.
- Maintain equipment predictably: preventive work can protect uptime and reduce disruptive failures, although it consumes planned capacity and parts.
- Manage water, chemicals and waste: recovery, leak detection, accurate dosing and treatment-process efficiency can reduce both purchased inputs and disposal load, subject to process and environmental requirements.
- Plan staffing around skills: adequate technicians and engineers can reduce prolonged downtime and overtime, while training and benefits remain part of the cost calculation.
These actions trade one resource for another. For example, an energy-saving mode that delays a restart may save electricity but lose more in throughput if it interrupts a constrained tool. Decisions should therefore be evaluated against cost per good output, not a single utility meter.
Quick Recap
Common mistakes when quoting fab costs
- Presenting an old percentage as a current average. The 1999 National Academies figures and 2018 SEMI examples are dated and have explicit scopes.
- Counting only electricity. UPW, gases, chemicals, HVAC, cooling, vacuum, abatement, central plant services and waste treatment are also utilities.
- Ignoring underutilization. A partially loaded fab still carries buildings, equipment, labour and maintenance costs.
- Mixing operating and capital costs. A facility budget that excludes construction and capital cannot be compared directly with a full-cost financial model.
- Using starts instead of good output. Scrap and yield loss consume resources but do not produce saleable dies.
- Generalizing regional comparisons. Wage, productivity and electricity observations depend on the locations and dates studied.
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