Atomic #52
critical
The solar metalloid you can't mine — 100% hostage to copper refining, and First Solar needs every gram.
Tellurium is a rare, brittle metalloid recovered almost exclusively as a by-product of copper electrolytic refining. With a crustal abundance of just 1-5 parts per billion — rarer than gold or platinum in the Earth's crust — it is one of the scarcest elements in commercial use. No primary tellurium mines exist. Its dominant application is cadmium telluride (CdTe) thin-film solar panels, where First Solar is both the world's largest manufacturer and the single biggest consumer of tellurium globally.
Global Refined Output
520-580
tonnes/year (2024)
Global Refining Capacity
650-750
tonnes/year
Crustal Abundance
1-5
ppb
Byproduct Dependency
~100%
from copper refining
CdTe Solar Demand Share
55-62%
of total consumption
Top 3 Regions Share
60-70%
China, Japan, Belgium
Spot Price (2025 Q1)
$270-310
/kg (OTC)
Current Rate
<5 tonnes/year (negligible)
End-of-Life Rate
CdTe panels have 25-30 year lifespan; mass end-of-life wave begins ~2035
Target
50-80 tonnes/year secondary supply projected by 2035-2040
Economics
First Solar closed-loop recycling achieves 95-97% Te recovery; economically viable at current prices but limited by panel EOL timing
| Grade | Specification | Form | Applications | Impurity Limits |
|---|---|---|---|---|
| 3N (99.9%) | Industrial grade | Powder, granules, ingot | Free-machining steel, copper alloys, rubber vulcanization | Total metallic <1000 ppm |
| 5N (99.999%) | Solar grade — CdTe precursor | Ingot, shot, powder | CdTe thin-film solar PV manufacturing, thermoelectric materials | Total metallic <10 ppm; critical threshold for photovoltaic efficiency |
| 6N+ (99.9999%) | High-purity thermoelectric and optics grade | Ingot, custom shapes | Advanced thermoelectrics (Bi2Te3), infrared optics (ZnTe, CdZnTe) | Total metallic <1 ppm; commands 2-4x price premium over 5N |
| 7N (99.99999%) | Semiconductor research grade | Ingot, single-crystal pieces | Specialized semiconductor research, niche detector applications | Total metallic <0.1 ppm |
Where Tellurium Goes
Largest
CdTe Thin-Film Solar
59%
CdTe Thin-Film Solar
59%Cadmium telluride photovoltaics — the dominant end-use. First Solar is the world's largest CdTe manufacturer, consuming an estimated 8-10 tonnes of Te annually at ~9 GW/yr production. CdTe's 1.44 eV bandgap is near-ideal for single-junction solar cells.
Thermoelectrics
18%Bismuth telluride (Bi2Te3) for Peltier coolers and thermoelectric generators. Used in CPU thermal management, data center cooling, automotive waste heat recovery, and space systems. Growing at 8-12% annually driven by AI accelerator cooling demands.
Metallurgy
12%Free-machining additive in steel (0.04-0.1% Te improves machinability 30-50%) and copper alloys (0.1-0.5% Te for marine corrosion resistance). Relatively price-insensitive below $300/kg.
Rubber Vulcanization
6%Vulcanization accelerator in EPDM rubber for high-voltage cable insulation, aerospace gaskets, and automotive seals. Gradually declining as alternative accelerators mature.
Other (IR Optics, PCM, Catalysts)
5%ZnTe and CdZnTe for infrared optics and thermal imaging; GeTe/Sb2Te3 for phase-change memory (Intel, Samsung); and catalysts in organic synthesis.
From Source to Industry
Who Uses Tellurium
| Industry Segment | Form Consumed | Purity Required | Key Customers | Constraints |
|---|---|---|---|---|
| Solar PV Manufacturing | CdTe powder/precursors (5N purity) | 5N (99.999%) | First Solar (dominant), other CdTe manufacturers | Long-term supply agreements required; 0.8-1.2 t Te per GW of CdTe capacity |
| Thermoelectric Devices | Bi2Te3 ingots and wafers (5N-6N) | 5N-6N | Laird Thermal, II-VI (Coherent), Ferrotec, Marlow Industries | Growing 8-12% annually; AI data center cooling driving demand acceleration |
| Steel and Alloy Manufacturing | Te metal powder/shot (3N) | 3N (99.9%) | Major steelmakers, specialty alloy producers | Price-insensitive below $300/kg; stable demand of 40-63 t/yr |
| Rubber Compounding | Te compounds (3N) | 3N (99.9%) | EPDM rubber manufacturers for cables and seals | Gradually declining as alternative accelerators mature |
| IR Optics and Defense | ZnTe, CdZnTe crystals (5N-6N) | 5N-6N | Defense contractors, thermal imaging manufacturers | Small volume but high value; strategic military applications |
Structural Bottlenecks
Mining HHI
N/A (by-product only); Te supply depends on copper refining geography, not mining
Refining HHI
Top 5 refiners control 75-80% of global refined output; top 3 regions (China/Japan/Belgium) = 60-70%
Chokepoints
Tellurium is recovered exclusively from copper anode slimes — it cannot be mined independently. Even if Te prices double, copper mines do not produce more anode slimes in response.
Impact
Supply growth is capped at ~2-3% per year (matching copper production growth), while demand may grow at 4-10% annually from solar expansion. A structural deficit emerges mechanically.
Mitigation
Improve recovery rates at existing copper refineries (currently 85-92% vs. theoretical 100%); install dedicated Te extraction lines at refineries that currently discard anode slimes.
Copper ores contain only 4-6 ppm tellurium. Crustal abundance of 1-5 ppb makes it rarer than gold. No economically viable primary Te mines exist anywhere globally.
Impact
No independent supply pathway. Total theoretical Te yield from all copper ore processed globally caps the available pool regardless of price incentives.
Mitigation
Research into telluride mineral deposits (sylvanite, calaverite) as potential primary sources at sustained prices above $500-800/kg.
Top five refiners (5N Plus, Umicore, Boliden, Aurubis, Mitsubishi Materials) control 75-80% of global refined output. China, Japan, and Belgium account for 60-70% of production.
Impact
Any major refinery disruption can tighten global supply by 5-10% within weeks. The 2011 Boliden Ronnskar fire caused a 6-month disruption and 40% Te price spike.
Mitigation
Diversify refining to North America and Nordic countries; support new entrants with Te recovery infrastructure.
Global refining capacity is 650-750 t/yr but actual recovery is only 520-580 t/yr. Many copper refineries lack dedicated Te extraction infrastructure.
Impact
100-170 tonnes of potential annual Te supply is left unrecovered, creating an avoidable gap.
Mitigation
Sustained prices above $400/kg incentivize full extraction, potentially unlocking 600-650 t/yr. Capex investment in Te recovery lines at underequipped refineries.
CdTe solar panels have 25-30 year lifespans. Panels installed 2005-2015 will not reach end-of-life until 2030-2045. Current recycling yields <5 t/yr.
Impact
No secondary buffer exists to absorb demand shocks during 2025-2035. The recycling option cannot resolve near-term supply-demand tension.
Mitigation
Scale up First Solar's closed-loop recycling program; prepare collection infrastructure for the 2035-2040 EOL wave.
What Could Replace Tellurium?
CIGS (copper indium gallium selenide)
Replacing in: Thin-film solar PV
CIGS is an alternative thin-film technology that uses selenium and indium instead of tellurium. Comparable efficiency (20-22% lab) but different supply chain constraints (indium, gallium). Does not substitute Te within CdTe — it replaces the entire technology.
Trend: CIGS market share declining vs. CdTe; indium and gallium supply also constrained
Perovskite solar cells
Replacing in: Thin-film solar PV
Perovskites contain no tellurium and have reached 26%+ lab efficiency. However, long-term stability and commercial-scale manufacturing remain unproven. Perovskite-CdTe tandems could actually sustain Te demand by boosting CdTe value proposition to 28-31% efficiency.
Trend: Rapidly advancing; pilot production announcements but no GW-scale deployment yet
Lead telluride (PbTe) alternatives (skutterudites, half-Heuslers)
Replacing in: Thermoelectrics
Emerging thermoelectric materials can partially replace Bi2Te3 at high temperatures (>300C), but Bi2Te3 remains unmatched at room temperature with ZT ~1.0. No drop-in substitute for Peltier cooling applications.
Selenium, sulfur, or other chalcogens
Replacing in: CdTe solar absorber
Tellurium is structurally required in CdTe. Replacing Te with sulfur or selenium would degrade the crystal structure and shift the bandgap away from the optimal 1.44 eV, destroying photovoltaic performance.
Key Events
2023
European Commission
Strategic reserve discussions initiated; recycling mandates for CdTe panels; support for European refining capacity (Umicore). EU Horizon Europe allocates >50M euros for substitution research.
2024
European Union
Framework for supply chain resilience including extraction and processing benchmarks. CdTe panel recycling mandated under Extended Producer Responsibility (WEEE Directive).
2024
USGS
Formal recognition of high supply risk and strategic importance for clean energy and defense. No formal US stockpiling program yet, but DoD discussions ongoing.
2022
US Congress
30% Investment Tax Credit for solar manufacturing (technology-neutral, covering CdTe) with 10% domestic content bonus. First Solar's US facilities qualify directly.
2011
European Parliament
CdTe panels exempted from cadmium restrictions because Cd is hermetically sealed and proven recycling pathways exist. Exemption remains in force; political consensus favors maintaining it for decarbonization.
Leading Indicators
First Solar capacity and production announcements
Each new GW of CdTe capacity requires ~0.8-1.2 tonnes of additional annual Te demand. First Solar is the single largest Te consumer globally.
Track via: First Solar quarterly earnings (investor.firstsolar.com); press releases on new factory announcements
Global copper refinery output
Copper production determines the total pool of anode slimes from which Te is recovered. A 5% copper output increase implies 25-40 additional tonnes of potential Te.
Track via: USGS Copper Commodity Summary; International Copper Study Group reports
Tellurium OTC spot prices
Sustained prices >$350/kg signal supply tightness; <$200/kg indicates weak demand or oversupply. Intra-week spikes of 20%+ may indicate refinery disruption.
Track via: Argus Metals Minor Metals service; Metal.com; CRU Group
CdTe panel recycling volumes
First Solar's recycling program is the primary source of secondary Te. Volumes >100,000 tonnes of panels/year would signal meaningful secondary supply.
Track via: First Solar annual sustainability reports
Perovskite commercialization milestones
Perovskite solar cells are the main medium-term competitor to CdTe. Standalone cells exceeding CdTe efficiency at <$0.50/W would threaten Te demand growth.
Track via: NREL efficiency records (nrel.gov); pilot production announcements >1 GW
China tellurium export policy
China produces 35-38% of global Te. Informal export quotas already exist; formal restrictions (analogous to rare earth controls) would cause immediate supply shock.
Track via: MOFCOM announcements; trade flow data from UN Comtrade
Refiner capacity expansion announcements
Capex commitments by 5N Plus, Umicore, Boliden, and Asarco signal market confidence and upcoming supply additions.
Track via: Company investor relations; quarterly reports and press releases
EU CRMA implementation and strategic reserves
EU decisions on tellurium strategic reserves and recycling mandates directly impact European supply security and refining investment.
Track via: European Commission DG GROW updates (ec.europa.eu)
Frequently Asked Questions
The majority of tellurium (55-62%) goes into cadmium telluride (CdTe) thin-film solar panels, where First Solar is the dominant manufacturer. Other uses include bismuth telluride thermoelectrics for Peltier coolers and waste heat recovery (15-20%), free-machining additives in steel and copper alloys (10-15%), rubber vulcanization accelerators (5-8%), and emerging applications in phase-change memory and infrared optics.
Tellurium is classified as critical by the EU (CRMA 2023) and the US (USGS 2024) due to extreme supply concentration risk, 100% by-product dependency on copper refining, crustal rarity of 1-5 ppb, and its essential role in CdTe solar technology for the energy transition. Supply cannot be independently scaled to meet growing demand.
Virtually all commercial tellurium is recovered as a by-product of copper electrolytic refining, extracted from anode slimes that form during the process. No primary tellurium mines exist. The top producing countries are China (180-210 t/yr), Japan (90-110 t/yr), the USA (60-80 t/yr), Belgium (50-70 t/yr), and Sweden (40-60 t/yr).
No. Tellurium is structurally required in CdTe photovoltaics. CdTe's bandgap of 1.44 eV is near-optimal for single-junction solar cells, and this property depends on the tellurium anion. The only alternatives to CdTe as a thin-film technology are CIGS (which uses selenium and indium, not tellurium) or perovskite solar cells (which contain no tellurium).
Cadmium is a human carcinogen, but in CdTe panels it is hermetically encapsulated within the module structure. Studies show no cadmium leaching under normal conditions. CdTe panels hold EU RoHS exemptions and are covered by WEEE Extended Producer Responsibility mandates. First Solar claims 99%+ cadmium recovery in its recycling program.
Tellurium trades on OTC minor metals markets at approximately $270-310/kg as of early 2025. Historical prices have ranged from $20/kg (early 2000s, when Te was often discarded) to $450/kg (H2 2023 peak). The market is illiquid with wide bid-ask spreads, and prices vary by purity grade, lot size, and delivery terms.
Not in the near term. Current recycled supply is <5 tonnes/year. CdTe panels have 25-30 year lifespans, so panels from 2005-2015 reach end-of-life around 2030-2045. First Solar operates the largest CdTe recycling program (95-97% Te recovery), but significant secondary supply of 50-80 t/yr is not expected until 2035-2040.
Tellurium is entirely a by-product of copper refining. Copper ores contain only 4-6 ppm tellurium, which concentrates in anode slimes during electrolytic refining. Global copper production of ~20 million tonnes/year yields roughly 520-580 tonnes of recovered tellurium. Supply growth is limited to ~2-3%/year (matching copper), while demand may grow at 4-10%/year from solar expansion.
Element Context
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