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Semiconductor fabs are among the most resource-intensive industrial facilities. A single fab can require up to 10 million gallons of water per day, while a voltage disturbance lasting a fraction of a second can ruin wafers in process. To reduce emissions and protect production, fabs combine renewable-electricity contracts and certificates with utility power, build elaborate ultrapure-water and wastewater systems, and use controls—and sometimes storage—to manage variability and emergencies.
The key distinction is between procured renewable electricity and power physically delivered from a dedicated wind or solar plant at every moment. Most corporate percentages describe market-based accounting across a portfolio. Water figures likewise describe a connected treatment and reuse system, not a simple one-pass supply. Batteries and other storage can improve resilience, but publicly disclosed, fab-scale battery capacities remain uncommon.
Why fabs need so much electricity and water
Manufacturing a wafer involves hundreds or thousands of tightly sequenced steps. Lithography, plasma etching, deposition, ion implantation, cleaning, metrology and chemical preparation all rely on electrically powered tools. Pumps, chillers, air handlers, vibration-control systems and cleanroom filtration operate continuously, even when wafers are not being processed.
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Because production is continuous, a fab treats electricity quality and water availability as yield-and-safety issues rather than ordinary overhead. A short outage can interrupt thermal control, stop chemical delivery or leave wafers partway through a process. A drought, treatment failure or contamination event can force a reduction in production even when the building still has electrical power.
How fabs obtain renewable electricity
Most fabs use a portfolio rather than a single source. The facility remains connected to the local grid for firm supply and balancing, while the company contracts renewable generation or purchases market instruments that match some or all of its consumption.
Power-purchase agreements and direct contracts
A power-purchase agreement (PPA) commits a buyer to electricity or the environmental attributes from a specified wind, solar or other renewable project. A company may also sign a direct supply contract with a renewable generator or procure rooftop and off-site solar. These arrangements can finance new capacity, but the physical electrons reaching a fab still follow the regional grid mix unless the site is electrically islanded from the grid.
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Renewable-energy certificates (RECs), guarantees of origin or equivalent instruments represent the environmental attributes of renewable generation. A company can report a high market-based renewable percentage by matching consumption with these instruments even though the local grid is not renewable every hour. Location-based accounting, by contrast, uses the average emissions intensity of the grid serving the facility. A serious comparison should show which method is being used.
What current company figures show
TSMC reported 4.4 GW of renewable-energy capacity under contract at the end of 2024. It also reported 1,450 GWh of renewable electricity consumed by its Taiwan fabs in 2024, with goals of obtaining 60% of electricity from renewable sources by 2030 and 100% by 2040. Its 2024 description includes rooftop-solar procurement and offshore-wind supply expected to begin in 2025.
Intel reported approximately 99% renewable electricity globally in 2025 and a goal of 100% by 2030. That figure is a corporate, global accounting result; it does not establish that every Intel site receives renewable power at every hour.
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Why procurement does not remove reliability requirements
Renewable contracts do not eliminate the need for substations, redundant feeders, uninterruptible power systems and backup generation. Solar output falls at night and during storms; wind output varies with weather. The grid, contracts and controls must collectively provide the instantaneous power quality that process tools require.
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How a fab makes and reuses ultrapure water
A fab’s water system is a treatment train with separate loops, not one large recycling tank. Source water is pretreated, purified, distributed to tools, collected by chemistry, treated and either returned to a suitable loop or discharged under permit.
1. Pretreatment and ultrapure-water production
Incoming water typically passes through filtration, softening or other pretreatment before reverse osmosis, deionization and polishing stages. The UPW plant removes particles, dissolved ions, organic compounds and microorganisms. Online instruments continuously check resistivity, total organic carbon, particle counts and other indicators before water reaches production equipment.
2. Segregation at the point of use
Used water is collected according to its chemistry. Acidic, alkaline, solvent-containing, metal-bearing and fluoride-containing streams need different treatment. Keeping streams separate prevents a difficult contaminant from spreading through a larger volume and makes recovery of relatively clean water more practical.
3. Treatment and polishing
Physical separation, neutralization, precipitation, filtration, biological treatment, membrane processes and adsorption may be combined. The exact sequence depends on the chemicals used and the discharge or reuse specification. Continuous sampling verifies that a treated stream is safe for its next use; a stream that is unsuitable for UPW may still be suitable for cooling or another lower-grade application.
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4. Reuse in the appropriate loop
Fabs prioritize the highest-value water for processes that truly require UPW. Reclaimed water can replace city water in cooling towers, scrubbers, toilets, irrigation or selected manufacturing steps. Closed-loop cooling reduces once-through demand and can allow lower-quality sources in cooling equipment. ASML describes internal closed-loop cooling and partial recycling of UPW in its deep-ultraviolet immersion systems, illustrating how equipment-level design can reduce withdrawals.
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How much water a semiconductor fab uses
SEMI says a single fab can demand up to 10 million gallons per day. “Up to” is important: actual demand varies with wafer size, process node, production volume, climate, cooling design and the amount of reclaimed water already in use. A leading-edge logic fab with extensive chemical processing can have a very different profile from a mature-node or memory facility.
Withdrawal, consumption and discharge are different metrics. Withdrawal is the water taken from a municipal or natural source. Consumption is the portion not returned to the source, often because it evaporates or becomes embedded in waste. Discharge is treated water released to a receiving system. A fab can reduce withdrawals through reuse without reducing every category by the same percentage.
Examples of water conservation and difficult-contaminant treatment
TSMC’s Tainan reclaimed-water program
TSMC reported using more than 19.65 million cubic metres of reclaimed water in its Tainan fabs by the end of 2024. The company said this reduced city-water use there by 31%. The figure is a cumulative or reported-use total for that location and year, not a universal reuse rate for every TSMC fab.
TSMC also reported 5.54 million cubic metres of water conservation in 2024. Conservation can include process optimization, leak reduction, cooling improvements and reuse projects; it should not be read as 5.54 million cubic metres of potable water eliminated by one technology.
PFAS removal with granular activated carbon
Some semiconductor processes produce wastewater containing persistent per- and polyfluoroalkyl substances (PFAS). TSMC reported using granular activated carbon on PFAS-containing process wastewater with an average removal rate of 95% in 2024. Activated carbon performance depends on the specific compounds, concentrations, contact time, competing contaminants and breakthrough monitoring. A reported average is therefore not a guarantee for every PFAS stream or every operating condition.
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STMicroelectronics reports formal water-risk assessments, site action plans and ongoing UPW recycling. This approach recognizes that a technically efficient plant can still face watershed stress, restrictions or competing community needs. A resilient program combines engineering controls with drought planning, alternative sources, emergency storage and communication with the water utility.
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Where grid storage and microgrids fit
Storage is an enabling option, not a universally documented feature of semiconductor fabs. Public material reviewed for this topic does not establish a named leading-edge fab with a disclosed battery capacity. That absence means readers should not assume that a fab claiming renewable electricity has a large onsite battery.
Short-duration ride-through
Flywheels, batteries and other power-conditioning systems can bridge the interval between a grid disturbance and backup generation or a controlled shutdown. They help protect sensitive tools from voltage sags, frequency changes and brief interruptions. The required duration may be seconds or minutes, but power quality—not just stored energy—is the design priority.
Peak shaving and demand response
A battery can charge when grid prices or emissions are lower and discharge during a facility peak. Reducing the site’s maximum demand may lower demand charges and ease constraints on a substation. Controls must ensure that a demand-response event never compromises cleanroom conditions, chilled-water production or process safety.
Renewable shifting and microgrid operation
Storage can move solar generation from midday into evening hours and coordinate onsite generation, controllable loads and the utility connection. Intel’s grid-modernization material describes sensors, edge computing, artificial-intelligence analytics and controls intended to balance renewable intermittency and demand. Such a system can improve flexibility without implying that the fab is electrically independent from the grid.
Backup generation is not the same as renewable storage
Emergency generators, typically designed for longer outages, provide a different service from a battery. They may keep essential pumps, safety systems and environmental controls operating while production is stopped or brought to a safe state. A battery system sized for seconds of ride-through cannot sustain a multi-hour outage, and a generator does not solve the carbon and fuel issues associated with routine energy use.
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What happens when a fab loses water or electricity?
Electrical disturbance
- Power-quality monitors detect a sag, outage or frequency event.
- Uninterruptible supplies and power conditioners hold critical controls, networking and selected tools long enough for automatic transfer or an orderly stop.
- Backup generation and switchgear start if the event persists, while noncritical loads are shed.
- Process engineers assess wafer lots, chemical conditions, temperature history and tool alarms before deciding whether to resume, rework or scrap material.
- Restart proceeds in stages: utilities stabilize first, then cleanroom systems, chemical delivery and process tools. Releasing production too quickly can create more defective wafers than the original outage.
Water interruption or contamination
- UPW sensors and distribution alarms isolate the affected loop or stop tools that require the specification.
- Stored water, redundant treatment trains and lower-grade reclaimed supplies support critical non-process functions where safe.
- Operators identify whether the cause is a source outage, membrane failure, chemical excursion, microbial event or distribution leak.
- The system is flushed, disinfected or re-polished as appropriate, and samples must meet release criteria before production resumes.
- Lots exposed to out-of-spec water are quarantined for engineering review; the cost is often measured in lost wafers and hours of capacity, not just the volume of water unavailable.
How to compare a fab’s sustainability strategy
Percent renewable electricity alone is not enough. Use the following measures together:
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| Dimension | Questions to ask |
|---|---|
| Carbon accounting | Are results location-based, market-based, or both? Are contracts new-build projects or existing certificates? |
| Reliability and power quality | Are there redundant feeders, ride-through systems, backup generation and tested islanding controls? |
| Water stress | How much is withdrawn, consumed and discharged, and is the site in a stressed watershed? |
| Reuse quality | Which streams are reclaimed, at what quality, and how is continuous monitoring performed? |
| Contaminant control | Are difficult substances such as PFAS treated with measured removal performance and breakthrough controls? |
| Scalability | Can the system handle more wafer layers, larger wafers and higher fab capacity without shifting impacts elsewhere? |
| Cost and operations | What capital, energy, chemical and maintenance burden does each treatment, storage or procurement measure add? |
Production growth can complicate the picture. TSMC notes that advanced processes and increasing output can push unit emissions or water targets off track even while absolute conservation projects improve. A credible assessment therefore reports both absolute totals and intensity per wafer, square centimetre or other clearly defined production unit.
What readers should take away
- Renewable electricity at a fab usually comes from a portfolio of grid supply, PPAs, certificates and direct renewable contracts; it is not necessarily hourly physical delivery from a dedicated generator.
- Water resilience depends on UPW production, chemistry-based segregation, treatment, closed-loop cooling and monitored reuse. A fab can need up to 10 million gallons daily, making watershed planning material to production continuity.
- Reclaimed water and advanced treatment can cut city-water withdrawals and address contaminants, but reported results are site- and process-specific.
- Storage can provide ride-through, peak shaving and renewable shifting when integrated with microgrid controls. Public disclosures do not support assuming a standard battery size—or even a battery—at every fab.
- The strongest programs measure carbon, reliability, withdrawals, reuse quality, contaminants, cost and growth together.
Frequently Asked Questions
Can a semiconductor fab run entirely on renewable energy?
A company can match all or nearly all of its electricity use with renewable contracts and market instruments, as Intel’s approximately 99% global figure for 2025 illustrates. That does not prove hourly physical renewable supply at every fab; grid connection and backup systems remain necessary.
How is ultrapure water different from reclaimed water?
Ultrapure water is treated to extremely low levels of particles, ions, organics and microorganisms for direct process use. Reclaimed water has been treated for a defined reuse purpose and may be suitable for cooling or scrubbers without meeting UPW specifications.
Do semiconductor fabs commonly use batteries?
Storage can provide ride-through, peak shaving, demand response and renewable-energy shifting, but publicly disclosed sources do not establish a standard battery capacity or a named leading-edge fab installation that represents the industry.
Why can a short power outage damage wafers?
A disturbance can stop tools mid-step, change temperature or chemical conditions, or interrupt cleanroom and filtration systems. Wafers must be evaluated against their process history before production can safely resume.
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