Hydrogen fuel cells are not inherently renewable or nonrenewable. Hydrogen is an energy carrier, not an energy source, which means its environmental credentials depend entirely on how the hydrogen itself is produced. When hydrogen is made using renewable electricity to split water, the fuel cell system can fairly be called renewable. When it’s made from natural gas, which accounts for the vast majority of production today, it cannot.
Why Hydrogen Isn’t a Fuel Like Solar or Wind
Unlike sunlight or wind, hydrogen doesn’t exist freely in nature in a usable form. It has to be manufactured from compounds that contain it, most commonly water or natural gas. This makes hydrogen more like a battery than a fuel: it stores and delivers energy that came from somewhere else. The U.S. Department of Energy classifies hydrogen explicitly as an energy carrier, not an energy source.
This distinction matters because calling a hydrogen fuel cell “renewable” without asking where the hydrogen came from is like calling an electric car “zero-emission” without asking how the grid electricity was generated. The fuel cell itself produces only water vapor and heat as byproducts. But the full picture includes everything upstream.
The Color-Coded System for Hydrogen
The energy industry uses a color system to describe how hydrogen is produced, and these labels determine whether the result counts as renewable.
- Green hydrogen is made by running renewable electricity (solar, wind, hydropower) through an electrolyzer, which splits water into hydrogen and oxygen. This is the only type broadly considered renewable.
- Gray hydrogen is produced from natural gas through a process called steam methane reforming, which releases carbon dioxide. This is how most of the world’s hydrogen is made today.
- Blue hydrogen also comes from natural gas, but the carbon emissions are captured and stored underground. It’s lower-carbon than gray but still fossil-fuel-based.
Global hydrogen production reached 97 million metric tons in 2023. Less than 1% of that qualified as low-emission, according to the International Energy Agency. The overwhelming majority still comes from fossil fuels.
What Makes Green Hydrogen “Renewable” Legally
Governments have started defining exactly what renewable hydrogen means in law, because the label carries financial incentives. The European Commission adopted rules in 2023 requiring that hydrogen labeled as renewable must meet two key tests. First, the renewable electricity used to produce it must come from new generation capacity, not electricity that was already powering something else. This is called “additionality.” Second, the hydrogen must be produced at times and in places where renewable electricity is actually available, so that making hydrogen doesn’t inadvertently cause more fossil fuel generation elsewhere.
The EU also requires that renewable hydrogen achieve at least a 70% reduction in greenhouse gas emissions across its full lifecycle, including upstream emissions, grid electricity, processing, and transport to the end user. In the United States, the Inflation Reduction Act offers tax credits of up to $3.00 per kilogram for clean hydrogen production, with the size of the credit tied to how low the lifecycle emissions are.
Energy Losses in the Hydrogen Chain
Even when hydrogen is produced from 100% renewable electricity, a significant share of that energy is lost before it reaches the end user. Electrolysis itself consumes roughly 40 megajoules out of every 120 megajoules contained in a kilogram of hydrogen. Compressing hydrogen for storage or transport takes another 10 to 15 megajoules. By the time compressed hydrogen reaches a fuel cell, more than 40% of the original renewable energy has already been dissipated.
The fuel cell then converts hydrogen back to electricity at around 45% to 55% system efficiency for the most common type (proton exchange membrane). Stacking these losses together means that a renewable-hydrogen fuel cell system delivers a smaller fraction of the original solar or wind energy to useful work than a battery would. This round-trip efficiency gap is one reason battery-electric vehicles have outpaced hydrogen cars in the passenger vehicle market, though hydrogen’s advantage lies in applications where batteries are impractical: long-haul trucking, shipping, industrial heat, and energy storage over days or weeks.
Water and Material Requirements
Producing one kilogram of hydrogen by electrolysis requires about 9 liters of water as a raw input. Purifying that water to the high standard electrolyzers need consumes another 15 liters per kilogram. In water-scarce regions, this adds up. Large-scale green hydrogen projects are already drawing scrutiny over whether their water demands compete with agriculture or drinking supplies.
Fuel cells also require platinum-group metals as catalysts. The amount needed has dropped dramatically: from about 1.1 grams per kilowatt of fuel cell capacity in 2005 to less than 0.2 grams by 2009, a reduction of more than 80%. That trend has continued, but platinum remains a finite, mined resource. Scaling hydrogen fuel cells to millions of vehicles or industrial installations will require either further reductions in platinum use, effective recycling programs, or alternative catalyst materials.
Cost Gap Between Green and Gray
The economics still favor fossil-based hydrogen. Gray hydrogen costs $1.50 to $2.50 per kilogram to produce. Blue hydrogen runs $2.00 to $3.50. Green hydrogen sits at $3.50 to $6.00 per kilogram, making it roughly two to three times more expensive than the conventional option.
That gap is narrowing as renewable electricity costs continue to fall, electrolyzers improve in efficiency and scale, and carbon pricing makes gray hydrogen more expensive. Government incentives like the U.S. tax credit can cut the effective cost of green hydrogen by up to $3.00 per kilogram, potentially bringing it into range of gray hydrogen in favorable locations. But for now, cost remains the primary reason less than 1% of global hydrogen production is low-emission.
The Short Answer
A hydrogen fuel cell can be part of a renewable energy system, but only if the hydrogen feeding it was produced from renewable sources. The technology itself is clean at the point of use. The supply chain behind it, today, mostly is not. Whether your hydrogen fuel cell is renewable comes down to a single question: where did the hydrogen come from?