Critical Mineral and Material Supply Availability and Energy System Development: A Multisector Analysis and Implications

Imagine the world's energy system as a giant, high-tech LEGO city. To build this city, you need two very different kinds of bricks. First, you need the "bulk" bricks: the massive, heavy, common blocks like steel, aluminum, and copper. These are the foundation; you need tons of them to build the walls, the roads, and the power lines. Second, you need the "specialty" bricks: tiny, rare, and highly specific pieces like lithium, neodymium, or platinum. You only need a few of these, but they are the secret sauce that makes the city's lights glow, its cars drive themselves, and its batteries hold a charge.

For a long time, scientists have worried that we might run out of the rare, specialty bricks needed to build our future green energy world. But this new study asks a bigger, more tangled question: What happens if we can't get enough of the common bricks, too? It turns out that if you can't get enough steel or copper, it doesn't just stop you from building one thing; it sends a shockwave through the entire LEGO city. Because every part of the city is connected, a shortage in one area forces you to change how you build everything else, making the whole city more expensive and harder to power. This research uses a super-smart computer model to simulate what happens when the supply of these materials gets squeezed, showing us that the future of our energy isn't just about finding rare minerals, but about making sure the whole supply chain stays strong.

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The Great Energy LEGO Shortage

A team of researchers from the Pacific Northwest National Laboratory decided to play a giant game of "What If?" using a sophisticated computer model called GCAM (Global Change Analysis Model). Think of GCAM as a digital twin of our entire economy, energy system, and environment. The team wanted to see what would happen if the world suddenly couldn't produce enough of the 13 most important materials needed to build our future energy systems. These materials include the heavy hitters like steel, aluminum, and copper, as well as the "specialty" stars like lithium (for batteries), neodymium (for magnets), and platinum (for fuel cells).

In their main "Central" scenario, they imagined a world where we can get as much of these materials as we need. But then, they created a series of "Constrained" scenarios. In these simulations, they artificially limited the production of these materials to just 25%, 50%, or 75% of what the model predicted we would need by the year 2050. They didn't just look at one sector; they watched how a shortage in one area rippled through electricity, transportation, and hydrogen production, seeing how the whole system tried to adapt.

The Ripple Effect: When One Brick Runs Out

The most surprising thing the simulation found is that shortages don't stay put. They spread like a virus. The researchers discovered that if you limit the supply of "bulk" materials like steel, aluminum, or copper, it doesn't just slow down the construction of power plants or cars; it forces the entire energy system to change its strategy.

For example, if steel production is cut in half, the model shows that the electricity sector takes a massive hit. Because steel is used in almost every type of power plant and transmission line, a shortage makes it too expensive to build new renewable energy. The system tries to adapt by shifting toward energy sources that use less steel, but this isn't a perfect fix. The result? By 2050, if steel production is limited to 50% of what we need, global electricity generation drops by 43%. If copper is limited, generation drops by 41%. If aluminum is limited, it drops by 31%.

This shortage also changes the price tag on our energy. In these simulations, limiting steel, aluminum, or copper to 50% of demand causes U.S. electricity prices to skyrocket by 39% to 70% by 2050. It's like if the price of cement suddenly doubled; suddenly, building a house becomes a luxury, and fewer people can afford to live in one.

The Dominoes Fall: Cars, Batteries, and Substitutes

The story gets even more interesting when you look at transportation. The model showed that when materials get scarce, the system tries to swap one technology for another, but it's not always a smooth swap.

• The Battery Battle: Lithium and graphite are the main ingredients for the batteries in electric cars (BEVs). If these get scarce, the model predicts that fewer electric cars will be built. But here's the twist: the system tries to fill the gap with other types of cars. Some electric cars switch to sodium-ion batteries (which don't use lithium), and some people switch back to gas-powered cars (ICE vehicles) because they use less of the scarce materials.
• The Fuel Cell Shift: Platinum is needed for hydrogen fuel cell cars. If platinum gets scarce, those cars become too expensive, and the system shifts back to electric cars or gas cars.
• The Cross-Over: The simulation found that these changes in one sector affect the others. For instance, if lithium is scarce and fewer electric cars are built, the demand for electricity drops. But if the system switches to hydrogen fuel cells to replace electric cars, the demand for hydrogen goes up, which then requires more hydrogen production technology. It's a giant game of musical chairs where the music never stops.

The "Bulk" vs. "Specialty" Showdown

One of the key takeaways from this study is the difference between the "bulk" materials and the "specialty" ones.

• Bulk Materials (Steel, Aluminum, Copper): These are the heavy lifters. The simulation suggests that shortages here are the most dangerous for the whole system. Because they are used in everything, a shortage in steel or copper causes the biggest drops in energy production and the biggest price hikes. They are the backbone of the energy system, and if the backbone breaks, the whole body suffers. Specifically, if bulk material production is halved, electric vehicle service costs could rise by 36% to 85%.
• Specialty Materials (Lithium, Neodymium, etc.): These are more specific. If lithium gets scarce, it mostly hurts battery technology. If neodymium gets scarce, it mostly hurts wind turbines. While these shortages still cause problems, the system can often find a workaround, like switching to a different type of battery or a different type of wind turbine. However, constraints on these specialty materials can still raise electric vehicle service costs by up to 40%.

The Bottom Line: It's All Connected

The authors of this study emphasize that we can't look at energy and materials in isolation. You can't just say, "We need more lithium for batteries," without thinking about how that affects the steel needed for the factory building those batteries, or the copper needed to charge them.

In these simulations, the researchers found that the energy system is incredibly interconnected. A shortage in one material creates a chain reaction that changes technology choices, shifts energy production, and drives up prices across the board. The study suggests that to build a secure energy future, we need to worry not just about the rare, shiny minerals, but also about the common, heavy ones like steel and copper. If we don't secure the supply of these "boring" bulk materials, the whole green energy transition could become much more expensive and much slower than we hope.

The study didn't prove that a shortage will happen, but it simulated what would happen if it did. The message is clear: in the race to build a clean energy future, we need to make sure we have enough of every single brick, from the tiniest speck of platinum to the heaviest beam of steel, or the whole LEGO city might start to crumble.