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Material World
Industry

Energy generation

Turning something into electricity — and the industry whose material demands have changed more in twenty years than in the previous hundred.

Generating and delivering electrical power, by combustion, nuclear fission, or capture of wind, sunlight and water. Its material requirements used to be dominated by one question — what survives at temperature and pressure in a boiler or turbine — and now include an entirely separate one about what a wind turbine, a solar panel and a battery are made of.

The distinction matters for supply. A gas turbine consumes nickel superalloys steadily; a wind farm consumes a large quantity of steel, concrete, copper and rare-earth magnets once and then very little for twenty-five years.

History

Steam and coal from the 1880s, with the whole of high-temperature metallurgy driven by the pursuit of higher boiler pressures. Nuclear generation from the 1950s created its own material science around zirconium cladding, which is used because it is nearly transparent to neutrons.

Wind and solar were marginal until the 2000s and are now the largest source of new capacity in most markets, which has made permanent magnets, silicon, silver paste and battery chemistry into energy materials.

Economic significance

The transition is a materials transition as much as an energy one. A grid built on wind, solar and storage needs far more copper, steel, lithium, nickel, cobalt, silicon and rare earths per unit of delivered energy than one built on combustion, and far less fuel — which converts a continuous fuel demand into a large up-front material demand.

That is a genuine change in the shape of the problem rather than only in its size, and it is why critical-material supply has become an energy-policy question.

Medium confidence Weak evidence

How we know: checked recently · only one source, so there is nothing to cross-check it against · stated directly by the source.

How this connects

Where a connection has been confirmed by an outside reference, that reference is named beside it.

uses

  • Nickel superalloy — alloy · gas turbine blades and vanes, in the same alloys and for the same reasons as aerospace
  • Neodymium magnet — alloy · direct-drive wind turbine generators, which is what put rare-earth supply into energy policy
  • Copper — element · generation, transmission and distribution — and a grid built on wind and solar needs substantially more of it per unit delivered
  • Cadmium telluride — compound · thin-film photovoltaics, the principal commercial alternative to crystalline silicon
  • Zirconium — element · nuclear fuel cladding, used because it is nearly transparent to neutrons — a property no other structural metal has
  • Portland cement — material · wind turbine foundations and dam construction, and it is a larger share of a wind farm's material mass than the turbine is
  • Lithium-ion cell — object · grid storage and electric vehicles, which is what turned a list of obscure elements into a geopolitical argument
  • Wind turbine blade — object · and it is the part of a turbine with no established end-of-life route, where the tower and foundation are steel and concrete
  • Glass fibre composite — material · wind turbine blades, the largest composite structures made and the ones now retiring without a route
  • Water — compound · the working fluid of essentially all thermal generation — coal, gas, nuclear and concentrated solar all boil water and expand the steam through a turbine
  • Peat — material · and the direction of travel is out: Ireland ended peat-fired generation in 2020, having built an entire state industry around it
  • Lithium iron phosphate — compound · close to unopposed in grid and home storage: a stationary installation does not care what it weighs, cycles daily for twenty years, and must not burn down a building
  • Battery graphite — material · and it is the most concentrated link in the battery supply chain — China refines very nearly all anode-grade material, and introduced export controls in 2023
  • Electrical steel — alloy · and its supply is part of why transformer lead times went from months to years after 2022: a grid connection queue is partly a materials queue
  • Polysilicon — material · and production is heavily concentrated in Xinjiang because the Siemens process needs cheap electricity, which is the basis of both the forced-labour import restrictions and the panel's carbon footprint
  • Solar panel — object · with an energy payback of one to two years against a service life of twenty-five — and which end of that range depends overwhelmingly on the grid that made the polysilicon

Sources

  • Material World
    Our own writing
  • Wikidata
    Wikimedia Foundation · Creative Commons CC0 1.0 Universal (public domain dedication)

Questions this page answers

Where it comes from, and what it becomes

Follow Energy generation back to what it starts as, and forward into what it becomes. Each step is a documented one — a real route material takes, not a chain of inference.

Upstream — what it comes from

  • Energy generation → uses (generation, transmission and distribution — and a grid built on wind and solar needs substantially more of it per unit delivered) → Copper → is produced by (as blister copper, refined electrolytically afterwards) → Smelting → takes as input (as the element removed, not added) → Oxygen → is produced by (the largest output by tonnage, and the reason air separation units sit beside steelworks) → Air separation → takes as input (the feedstock, and an unusual one in being free, unlimited and available anywhere — the cost is entirely the energy to liquefy it) → Air
  • Energy generation → uses (wind turbine foundations and dam construction, and it is a larger share of a wind farm's material mass than the turbine is) → Portland cement → is composed of (as calcium oxide within the clinker phases, not as free lime) → Quicklime → is produced by (the solid residue once carbon dioxide has been driven off) → Calcination → takes as input (heated until the carbonate decomposes to lime and carbon dioxide) → Limestone → is composed of → Calcite
  • Energy generation → uses (nuclear fuel cladding, used because it is nearly transparent to neutrons — a property no other structural metal has) → Zirconium → is produced by (reduced from the tetrachloride with magnesium, by the same route and in the same kind of vessel as titanium) → Kroll process → takes as input (the inert atmosphere, without which the titanium would take oxygen from the air) → Argon → is produced by (drawn from an intermediate height in the column, between nitrogen and oxygen) → Air separation → takes as input (the feedstock, and an unusual one in being free, unlimited and available anywhere — the cost is entirely the energy to liquefy it) → Air
  • Energy generation → uses (direct-drive wind turbine generators, which is what put rare-earth supply into energy policy) → Neodymium magnet → is composed of (the bulk of the alloy, and the reason it is cheap enough to put in a toy) → Iron → is produced by (as pig iron, high in carbon and brittle until refined) → Smelting → takes as input (as the element removed, not added) → Oxygen → is produced by (the largest output by tonnage, and the reason air separation units sit beside steelworks) → Air separation
  • Energy generation → uses (gas turbine blades and vanes, in the same alloys and for the same reasons as aerospace) → Nickel superalloy → is composed of (with titanium, the elements that form the strengthening phase — a few per cent, and the whole mechanism) → Aluminium → is extracted from (via alumina — bauxite is refined by the Bayer process before smelting) → Bauxite → is sourced from (the residue of prolonged tropical weathering, which strips the silica and alkalis out of an aluminosilicate rock and leaves the aluminium behind — basalt is one common parent among several) → Basalt → is composed of (an early-crystallising constituent of basaltic magma) → Olivine
  • Energy generation → uses (grid storage and electric vehicles, which is what turned a list of obscure elements into a geopolitical argument) → Lithium-ion cell → is made of (in the cathode of the older chemistries, and the component the industry has been designing away from) → Cobalt → is sourced from (much of world supply arrives as a by-product of copper mining rather than from cobalt-first operations) → Copper → is produced by (as blister copper, refined electrolytically afterwards) → Smelting → takes as input (roasted to drive off sulfur, then reduced to copper) → Chalcopyrite

These are the most distinct paths back. Energy generation can be traced through others besides.