Pink hydrogen is hydrogen produced using nuclear energy. Specifically, it refers to splitting water into hydrogen and oxygen through electrolysis, where the electricity powering that process comes from a nuclear power plant. It sits within a broader “color spectrum” that the energy industry uses to categorize hydrogen by how it’s made, and pink hydrogen’s defining feature is its nuclear power source.
How the Color Spectrum Works
The hydrogen itself is always the same molecule regardless of color label. What changes is the energy source and method used to produce it. Grey hydrogen comes from natural gas reforming and releases carbon dioxide. Blue hydrogen uses the same process but captures the carbon. Green hydrogen uses renewable electricity like wind or solar to split water. Pink hydrogen uses nuclear electricity to split water.
Within nuclear-powered hydrogen, there are actually three closely related colors. Pink hydrogen specifically uses electricity from nuclear plants to run electrolyzers. Red hydrogen uses nuclear heat directly to break water apart through a thermal process called thermolysis. Purple hydrogen combines both nuclear electricity and nuclear heat. In practice, “pink hydrogen” is often used as a catch-all for any nuclear-powered hydrogen production, and it’s the term you’ll encounter most often.
How Nuclear Electrolysis Works
The core chemistry is straightforward: water molecules are split into hydrogen gas and oxygen gas using electrical energy. An electrolyzer passes electric current through water, breaking the bonds that hold hydrogen and oxygen together. When that electricity comes from a nuclear reactor, the resulting hydrogen carries no carbon emissions from the production process.
Nuclear plants offer a second advantage beyond just clean electricity. They generate enormous amounts of heat, and that heat can be put to work. A method called high-temperature steam electrolysis feeds steam rather than liquid water into the electrolyzer. Because the water is already superheated, the electrolyzer needs less electrical energy to finish splitting it apart. Conventional electrolysis from the grid runs at roughly 27% system efficiency. Coupling an electrolyzer with a high-temperature reactor pushes that efficiency significantly higher, because the reactor’s waste heat does part of the work that electricity would otherwise have to do.
The total energy needed to split water has two components: electrical energy and thermal energy. At higher temperatures, more of the job shifts to the thermal side, which nuclear reactors supply cheaply as a byproduct of normal operation. This is why nuclear plants are particularly well suited to hydrogen production compared to simply plugging an electrolyzer into any power source.
Why Nuclear Power Has an Edge for Hydrogen
The biggest practical advantage of pink hydrogen is reliability. Nuclear plants run around the clock at near-full capacity for months at a time. Wind and solar output fluctuates with weather and time of day, which means green hydrogen electrolyzers sit idle during calm or cloudy periods. A nuclear-powered electrolyzer can run continuously, producing hydrogen at a steady rate without needing battery storage or backup power.
This matters for cost. An electrolyzer that runs 90% of the time spreads its capital cost over far more kilograms of hydrogen than one running 30% of the time. It also matters for industrial customers who need a predictable supply. The U.S. Department of Energy has highlighted that nuclear plants can produce and sell hydrogen regionally as a commodity alongside their normal job of supplying electricity to the grid.
What Pink Hydrogen Costs
Pink hydrogen isn’t cheap yet, but it’s competitive with green hydrogen and getting less expensive. For context, here’s how production costs compare across the spectrum:
- Grey hydrogen: $0.89 to $2.33 per kilogram
- Blue hydrogen: $1.33 to $3.32 per kilogram
- Green hydrogen: $2.40 to $16.50 per kilogram
- Pink hydrogen (existing large reactors): $2.18 to $5.46 per kilogram
- Pink hydrogen (small modular reactors): $6.17 to $8.29 per kilogram today, projected to reach $4.73 to $6.25 by 2035
The wide range for green hydrogen reflects how much local conditions matter: a solar-rich desert produces cheaper green hydrogen than a cloudy northern climate. Pink hydrogen’s range is narrower because nuclear plants operate consistently regardless of geography. Existing large reactors like the ones at Palo Verde and Davis-Besse already produce pink hydrogen at costs that overlap with the lower end of green hydrogen pricing. Small modular reactors, which are newer and still scaling up, cost more today but are expected to come down as both the reactor technology and electrolyzer manufacturing mature.
The biggest cost drivers are the upfront capital for the reactor and electrolyzer, financing costs, and how much electricity the electrolyzer consumes per kilogram of hydrogen. Fuel and day-to-day operating expenses play a smaller role.
Real Projects Underway
Pink hydrogen is moving from concept to demonstration. Two U.S. projects supported by the Department of Energy are expected to begin producing hydrogen in 2025.
Vistra Corporation is installing an electrolysis system at the Davis-Besse Nuclear Power Station in Ohio. The hydrogen produced there could supply local industrial users and fuel a nearby bus fleet. Xcel Energy is running a first-of-its-kind project at the Prairie Island Nuclear Generating Plant using high-temperature electrolysis, the more efficient steam-based method. Both projects aim to prove that existing nuclear plants can add hydrogen production without major modifications, potentially opening a new revenue stream for the nuclear industry.
Safety Considerations
Putting a hydrogen production facility next to a nuclear reactor introduces some engineering challenges, though none that are considered unsolvable. Hydrogen is flammable in air at concentrations between 4% and 74%, so the primary concern is preventing large, sudden releases of hydrogen gas near reactor buildings or electrical equipment.
Distance is the first line of defense. Co-located hydrogen facilities are designed with physical separation from critical reactor systems. One-way valves in pipelines limit how much hydrogen could escape from a single rupture point. Low-pressure systems dilute any released hydrogen quickly enough that it becomes too thin to ignite. The U.S. Nuclear Regulatory Commission requires site-specific safety assessments covering fire protection, explosion risk, and the electrical connections between the hydrogen facility and the plant’s power systems.
One subtler risk involves the electrical and thermal loads. If the hydrogen facility suddenly stops drawing power or heat (say, from an equipment trip), the abrupt change in demand can stress the reactor’s transformers and thermal systems. Facility designs account for this with protective controls, but it’s a consideration that doesn’t exist when a nuclear plant simply feeds electricity to the grid.
Where Pink Hydrogen Fits in the Energy Transition
Pink hydrogen occupies a middle ground in decarbonization. It produces no carbon emissions during the hydrogen production step, which puts it in the same “clean” category as green hydrogen. Critics point out that nuclear energy carries its own concerns: radioactive waste, high construction costs, and long build timelines for new plants. Supporters counter that hundreds of nuclear plants already exist worldwide and could begin producing hydrogen with relatively modest additions.
For countries that already operate nuclear fleets, pink hydrogen offers a way to produce clean hydrogen at scale without waiting for massive buildouts of wind and solar capacity. The MENA region, parts of Europe, and the United States are all exploring regulatory frameworks to enable it. For regions building new nuclear capacity, particularly small modular reactors, hydrogen production adds a second revenue stream that can improve the economic case for the reactor itself.