Green Hydrogen Explained and Whether It Can Scale
Imagine standing at the edge of a huge solar farm at sunset, a banner on the fence promising to "power the hydrogen economy." A few hours later, in a meeting room, a potential buyer asks one plain question: what will it cost per kilogram, delivered to my plant? The room goes quiet. That pause is where most of the story of green hydrogen is being written right now.
Green hydrogen is hydrogen made by splitting water with renewable electricity, so producing it releases no carbon dioxide. The chemistry works. Whether it can scale depends on three practical things: clean electricity that is cheap and available for many hours a year, buyers willing to commit to a price above today's fossil-based hydrogen, and the pipes, ports and storage to move it. So far, scale-up is running behind the announcements. The International Energy Agency (IEA) reports that low-emissions hydrogen output grew about 20% in 2025 to almost 1 million tonnes, still a small fraction of the roughly 100 million tonnes of hydrogen the world uses each year.
This guide explains how green hydrogen works, what actually decides its cost, where it has a real chance of scaling and where it probably does not, and how to judge any new announcement. There is a cost calculator in the middle that lets you test the numbers yourself. Last updated: October 2026.
Key takeaways
- "Green" refers to how the hydrogen is made (electrolysis powered by renewables), not to the gas itself. Hydrogen from natural gas is called gray, and with carbon capture, blue.
- Cost is driven by three levers: the price of electricity, how many hours a year the electrolyzer runs, and the cost of the equipment.
- Demand is the missing piece. The IEA's 2026 review says offtake agreements remain insufficient to unlock large-scale investment.
- The best early markets are the ones that already use hydrogen, such as refining and fertilizer, plus a few hard-to-electrify sectors.
- Numbers in this field change quickly. Treat any single figure as a snapshot and check the latest IEA update.
What is covered
What green hydrogen is, in plain terms
Hydrogen is a molecule that can store and carry energy, and it is already a major industrial chemical. Today it is mostly made from natural gas, a process that releases carbon dioxide. Commonly cited figures put gas-based hydrogen on the order of 10 kilograms of CO2 per kilogram of hydrogen.
The color labels
- Gray hydrogen: made from natural gas (or coal) with emissions released.
- Blue hydrogen: made from natural gas with most of the carbon captured and stored. Its climate benefit depends on how well the capture works and on methane leaks along the gas supply chain.
- Green hydrogen: made by electrolysis, using an electrolyzer to split water into hydrogen and oxygen, powered by renewable electricity.
One detail matters more than the label suggests: green hydrogen is only as clean as the electricity behind it. Plugging an electrolyzer into a fossil-heavy grid does not make clean hydrogen. That is why some jurisdictions, including the European Union, have written rules about where and when the electricity must come from.
The numbers that shape everything
- Water: the chemistry needs at least about 9 kilograms of water per kilogram of hydrogen. Real plants use more once purification and cooling are included.
- Electricity: producing a kilogram typically takes in the neighborhood of 50 to 55 kilowatt-hours. A kilogram of hydrogen holds roughly 33 kilowatt-hours of usable energy, so around a third of the input energy is already lost before compression, transport or use.
- Round trip: turning electricity into hydrogen and back into electricity loses much more, often cited in the range of roughly 30% to 40% returned. This is why many analysts say to use electricity directly wherever possible and reserve hydrogen for jobs that electricity cannot do easily.
Where scaling stands in 2026
Figures below come from the IEA's Global Hydrogen Review, the most widely used annual tracker, as reported in its 2026 edition and the 2025 edition before it. A note on terms: the IEA tracks "low-emissions hydrogen," which includes green hydrogen from electrolysis and also hydrogen from fossil fuels with carbon capture. Green is a subset.
- Output is small but growing. Low-emissions hydrogen production rose about 20% in 2025 to almost 1 million tonnes, with progress concentrated in a small number of projects.
- The pipeline has shrunk. The 2026 review puts announced low-emissions projects for 2030 at 27 million tonnes, down from 37 million in the 2025 edition, mostly because of cancellations and delays. The 2025 edition had itself been cut from 49 million tonnes the year before.
- Investment decisions slowed. Reports on the 2026 review say only about 300 thousand tonnes per year of additional capacity reached a final investment decision since the previous edition, and that new decisions fell for the first time in 2025.
- Demand is the bottleneck. The IEA describes demand as the crucial missing piece, with refining and chemicals leading adoption as policies that create demand gather pace.
- Manufacturing is concentrated. In the 2025 review, China accounted for about 65% of electrolyzer capacity that was installed or at final investment decision, and close to 60% of manufacturing capacity.
- Europe's first large plants. The first large-scale European projects are expected to start up in 2026, though slow policy implementation is holding back further expansion.
- Africa. The IEA sees long-term potential but says projects there need a clear tie to wider development goals such as industry, food security and trade.
The IEA also notes that conflict in the Middle East has disrupted production and trade of hydrogen-based products. You can read the agency's own overview on the IEA hydrogen page.
Three illustrative readers, three different questions
The scenarios below are made up to show how the same technology looks from different seats. They are not real people or projects.
The fertilizer plant manager
Her plant already makes hydrogen from gas to produce ammonia. Switching to green hydrogen needs no new chemistry, since the molecule is identical. Her question is purely commercial: can the premium be covered by a buyer, a policy or a carbon price? She is the textbook early customer, and her story continues under where hydrogen makes sense.
The city transport planner
He is comparing hydrogen buses with battery buses. His answer depends on route length, depot space, local electricity prices, and whether a reliable hydrogen supply exists nearby. It is a case-by-case decision, and batteries often win on energy efficiency alone.
The renewable developer
She controls land with excellent sun and wind and wonders about exporting hydrogen. Cheap power is the start, not the finish: she still needs a buyer, a conversion route for shipping, and a port. Her path runs through the cost levers and the announcement checklist.
What decides the cost
When people ask whether green hydrogen is "too expensive," they are usually pointing at one of three levers.
- Electricity price. At roughly 52 kilowatt-hours per kilogram, every 10 USD per megawatt-hour of power adds about 0.52 USD to each kilogram.
- Utilization. An electrolyzer is an expensive machine. If it runs only when the sun shines, its capital cost is spread over fewer kilograms. Solar alone might run it a quarter of the year or so; a wind and solar mix more; steady grid power nearly all of it.
- Equipment cost and financing. The installed cost per kilowatt, plus the interest rate and project life, set the capital charge on every kilogram.
The tension is that the cheapest electricity tends to come with low utilization, and the highest utilization tends to need pricier power. The table shows four illustrative setups using one formula and the same assumptions (1,500 USD per kW installed, 8% financing cost, 20-year life, 52 kWh per kg).
| Illustrative setup |
Power price (USD/MWh) |
Utilization |
Electricity per kg |
Equipment per kg |
Approx. total per kg |
| Solar only | 30 | 25% | 1.56 | 3.63 | 5.19 |
| Wind and solar mix | 30 | 50% | 1.56 | 1.81 | 3.37 |
| Steady grid power | 60 | 90% | 3.12 | 1.01 | 4.13 |
| Dream case: cheap and steady | 30 | 90% | 1.56 | 1.01 | 2.57 |
Illustrative arithmetic only, not real project data. It leaves out water, operation and maintenance, stack replacement, compression, storage, transport and subsidies.
Read the first and fourth rows side by side. The same cheap electricity gives an outcome twice as expensive when the machine sits idle three quarters of the year. That is the hidden reason "cheapest solar in the world" does not automatically mean cheapest hydrogen.
For comparison, published estimates for today's gray hydrogen often fall somewhere around 1 to 3 USD per kilogram depending on regional gas prices, while published estimates for green hydrogen are commonly higher, from a few dollars to well above 5 USD per kilogram depending on the market. Sources disagree on exact figures, which is itself a sign of how project-specific the cost is.
Try it: estimate a cost per kilogram
Change the numbers below to see how electricity price, utilization and equipment cost move the result. The starting values are editable examples, not real data.
Try dropping the running share from 50% to 25% and watch the equipment share double. Then raise it to 90% and see how much a steady power supply is worth. This is the quickest way to see why developers care so much about firm, not just cheap, electricity.
Why scale-up is slower than the headlines
The cost gap is the visible problem. Several others sit behind it.
1. Buyers are not signing
A producer needs a long-term contract at a known price to borrow money. A buyer facing a premium over gas-based hydrogen has little reason to sign unless a rule, subsidy or carbon price makes it worthwhile. The IEA calls this lack of demand the crucial missing piece.
2. Policy is uncertain
Incentives and sourcing rules have shifted or been slow to implement in several regions. Developers cannot finance a 20-year asset against rules that might change in two.
3. Hydrogen is awkward to move
It is the lightest molecule, so a given volume carries relatively little energy. Moving it as a gas needs dedicated pipelines or compression; moving it by ship usually means converting it to something like ammonia, which adds cost and energy losses. Large-scale storage, such as in salt caverns, depends on suitable geology.
4. Electricity must be genuinely clean and available
Green hydrogen competes for renewable power with everything else that is electrifying. Using that power directly is usually more efficient than turning it into hydrogen.
5. Equipment costs have not fallen on schedule
Reporting on the 2025 IEA review noted that higher electrolyzer prices weighed on projects, while falling natural gas prices at that time widened the gap in favor of fossil hydrogen. Cheaper, mass-produced systems, with China as the leading manufacturer, may help over time, but the pace is uncertain.
6. Water and siting matter locally
Water needs are often manageable in volume terms compared with the electricity requirement, but they matter in dry regions, where desalination may be part of the project.
Where hydrogen makes sense and where it does not
Hydrogen is not equally useful everywhere. The table gives a general view of how analysts tend to see each use. It is not a forecast, and individual cases will differ.
| Use |
Why hydrogen is considered |
Main competing option |
General outlook |
| Refining, ammonia and methanol | Same molecule already used, so plants can switch supply | Fossil hydrogen, possibly with carbon capture | Most direct route to early volume; the question is who pays the premium |
| Steelmaking | Can replace coal in some ore-based routes | Scrap-based electric furnaces, carbon capture | Promising where ore-based steel is needed, but depends on secure supply |
| Shipping and aviation fuels | Few easy alternatives for long distances | Biofuels, efficiency measures | Needed in principle; costly because of extra conversion steps |
| Heavy road transport | Fast refueling and long range | Battery-electric trucks | Contested; depends on duty cycle and infrastructure |
| Long-duration power storage | Can store energy for weeks or seasons | Batteries for short periods, other firm power | Niche, but potentially valuable in grids dominated by renewables |
| Passenger cars and home heating | Familiar fueling idea | Batteries and heat pumps using electricity directly | Generally seen as weak, since direct electricity needs far less energy per unit of service |
The pattern is consistent: hydrogen has the strongest case where it replaces hydrogen that is already in use, or where a molecule rather than electricity is truly required. It has the weakest case where electricity can do the job directly.
How to judge a green hydrogen announcement
Big headline capacity figures are easy to publish and hard to deliver, which is why the project pipeline keeps being revised down. Five questions separate a plan from a press release.
- Is there a signed buyer, and at what price? An offtake agreement matters more than a capacity target.
- Has it reached a final investment decision, or is it only announced? Announced, under construction and operating are very different stages.
- Where does the power come from, and how many hours will the electrolyzer run? Use the calculator above to see what that implies.
- How does the hydrogen reach the user? On-site use, a pipeline, or conversion to ammonia each change the cost and the carbon footprint.
- What happens if subsidies or rules change? A project that only works with one specific incentive is carrying policy risk.
So, can it scale?
Technically, yes: electrolysis is proven, manufacturers are expanding, and the IEA still expects production to keep growing. Commercially, the evidence so far points to slower, more selective scaling than the early forecasts assumed. The most likely path is not "hydrogen everywhere" but hydrogen first in the industries that already depend on it, then in a few hard-to-electrify sectors, with growth tied to where cheap and steady clean power meets a committed buyer.
Several things would change the picture: sustained falls in equipment cost, firm low-cost renewable supply, clear and stable demand policies, and visible final investment decisions turning into operating plants. Forecasts also disagree about when green hydrogen could match fossil hydrogen on cost in the best locations, with some analysts pointing to the end of this decade and others expecting later. Treat any single date with caution.
Questions people ask
Is green hydrogen the same as "low-emissions" or "clean" hydrogen?
No. Low-emissions hydrogen is the broader category. It includes green hydrogen from electrolysis and also blue hydrogen from fossil fuels with carbon capture. Always check which one a statistic or announcement is actually about.
Does making green hydrogen use too much water?
The chemistry needs about 9 kilograms of water per kilogram of hydrogen at minimum, and real plants use more. In many analyses the volume is manageable relative to the electricity challenge, but it can be a real constraint in water-stressed regions, where desalination or other sources need to be planned from the start.
When will green hydrogen be cheaper than gray hydrogen?
There is no agreed date. It depends on local power prices, equipment costs, gas prices, carbon pricing and how many hours the electrolyzer runs. Some analyses see parity in the best locations toward the end of this decade, while the recent project cancellations suggest the timeline may stretch. The calculator above shows which assumptions matter most.
Back to the quiet meeting room
The buyer's question, what does it cost per kilogram, delivered to my plant, is not an obstacle to the story. It is the story. Green hydrogen scales wherever someone can answer that question with a credible price, a firm electricity supply and a route to the customer. Where those are missing, the banner on the fence stays just a banner. A good next step is to take one announcement you have read about and run it through the five questions above.
Figures in this article are drawn from the IEA's Global Hydrogen Review editions and press coverage of them, and from general industry cost ranges, which vary by source and change quickly. Check the latest IEA publication before relying on any number for a decision. This article is general information, not engineering, investment or policy advice.
Read next
<!-- Title: Green Hydrogen Explained and Whether It Can Scale -->
<!-- Meta Description: Green hydrogen explained: how it is made, what it costs, why projects stall, and where it can realistically scale, with a quick cost calculator. -->
<!-- Slug: green-hydrogen-explained-can-it-scale -->
<p><em>Imagine standing at the edge of a huge solar farm at sunset, a banner on the fence promising to "power the hydrogen economy." A few hours later, in a meeting room, a potential buyer asks one plain question: what will it cost per kilogram, delivered to my plant? The room goes quiet. That pause is where most of the story of green hydrogen is being written right now.</em></p>
<p><strong>Green hydrogen is hydrogen made by splitting water with renewable electricity, so producing it releases no carbon dioxide.</strong> The chemistry works. Whether it can scale depends on three practical things: clean electricity that is cheap and available for many hours a year, buyers willing to commit to a price above today's fossil-based hydrogen, and the pipes, ports and storage to move it. So far, scale-up is running behind the announcements. The International Energy Agency (IEA) reports that low-emissions hydrogen output grew about 20% in 2025 to almost 1 million tonnes, still a small fraction of the roughly 100 million tonnes of hydrogen the world uses each year.</p>
<p>This guide explains how green hydrogen works, what actually decides its cost, where it has a real chance of scaling and where it probably does not, and how to judge any new announcement. There is a cost calculator in the middle that lets you test the numbers yourself. <em>Last updated: October 2026.</em></p>
<!-- IMAGE: Diagram of an electrolyzer splitting water into hydrogen and oxygen using solar and wind power | alt: Simple diagram of green hydrogen production by electrolysis powered by solar panels and wind turbines -->
<h2 id="key-takeaways">Key takeaways</h2>
<ul>
<li>"Green" refers to how the hydrogen is made (electrolysis powered by renewables), not to the gas itself. Hydrogen from natural gas is called gray, and with carbon capture, blue.</li>
<li>Cost is driven by three levers: the price of electricity, how many hours a year the electrolyzer runs, and the cost of the equipment.</li>
<li>Demand is the missing piece. The IEA's 2026 review says offtake agreements remain insufficient to unlock large-scale investment.</li>
<li>The best early markets are the ones that already use hydrogen, such as refining and fertilizer, plus a few hard-to-electrify sectors.</li>
<li>Numbers in this field change quickly. Treat any single figure as a snapshot and check the latest IEA update.</li>
</ul>
<h2 id="contents">What is covered</h2>
<ul>
<li><a href="#what-it-is">What green hydrogen is, in plain terms</a></li>
<li><a href="#where-scaling-stands">Where scaling stands in 2026</a></li>
<li><a href="#three-readers">Three illustrative readers, three different questions</a></li>
<li><a href="#what-decides-cost">What decides the cost</a></li>
<li><a href="#try-it">Try it: estimate a cost per kilogram</a></li>
<li><a href="#why-slow">Why scale-up is slower than the headlines</a></li>
<li><a href="#best-uses">Where hydrogen makes sense and where it does not</a></li>
<li><a href="#judge-announcements">How to judge a green hydrogen announcement</a></li>
<li><a href="#can-it-scale">So, can it scale?</a></li>
<li><a href="#faq">Questions people ask</a></li>
</ul>
<h2 id="what-it-is">What green hydrogen is, in plain terms</h2>
<p>Hydrogen is a molecule that can store and carry energy, and it is already a major industrial chemical. Today it is mostly made from natural gas, a process that releases carbon dioxide. Commonly cited figures put gas-based hydrogen on the order of 10 kilograms of CO2 per kilogram of hydrogen.</p>
<h3>The color labels</h3>
<ul>
<li><strong>Gray hydrogen:</strong> made from natural gas (or coal) with emissions released.</li>
<li><strong>Blue hydrogen:</strong> made from natural gas with most of the carbon captured and stored. Its climate benefit depends on how well the capture works and on methane leaks along the gas supply chain.</li>
<li><strong>Green hydrogen:</strong> made by electrolysis, using an electrolyzer to split water into hydrogen and oxygen, powered by renewable electricity.</li>
</ul>
<p>One detail matters more than the label suggests: green hydrogen is only as clean as the electricity behind it. Plugging an electrolyzer into a fossil-heavy grid does not make clean hydrogen. That is why some jurisdictions, including the European Union, have written rules about where and when the electricity must come from.</p>
<h3>The numbers that shape everything</h3>
<ul>
<li><strong>Water:</strong> the chemistry needs at least about 9 kilograms of water per kilogram of hydrogen. Real plants use more once purification and cooling are included.</li>
<li><strong>Electricity:</strong> producing a kilogram typically takes in the neighborhood of 50 to 55 kilowatt-hours. A kilogram of hydrogen holds roughly 33 kilowatt-hours of usable energy, so around a third of the input energy is already lost before compression, transport or use.</li>
<li><strong>Round trip:</strong> turning electricity into hydrogen and back into electricity loses much more, often cited in the range of roughly 30% to 40% returned. This is why many analysts say to use electricity directly wherever possible and reserve hydrogen for jobs that electricity cannot do easily.</li>
</ul>
<h2 id="where-scaling-stands">Where scaling stands in 2026</h2>
<p>Figures below come from the IEA's Global Hydrogen Review, the most widely used annual tracker, as reported in its 2026 edition and the 2025 edition before it. A note on terms: the IEA tracks "low-emissions hydrogen," which includes green hydrogen from electrolysis and also hydrogen from fossil fuels with carbon capture. Green is a subset.</p>
<ul>
<li><strong>Output is small but growing.</strong> Low-emissions hydrogen production rose about 20% in 2025 to almost 1 million tonnes, with progress concentrated in a small number of projects.</li>
<li><strong>The pipeline has shrunk.</strong> The 2026 review puts announced low-emissions projects for 2030 at 27 million tonnes, down from 37 million in the 2025 edition, mostly because of cancellations and delays. The 2025 edition had itself been cut from 49 million tonnes the year before.</li>
<li><strong>Investment decisions slowed.</strong> Reports on the 2026 review say only about 300 thousand tonnes per year of additional capacity reached a final investment decision since the previous edition, and that new decisions fell for the first time in 2025.</li>
<li><strong>Demand is the bottleneck.</strong> The IEA describes demand as the crucial missing piece, with refining and chemicals leading adoption as policies that create demand gather pace.</li>
<li><strong>Manufacturing is concentrated.</strong> In the 2025 review, China accounted for about 65% of electrolyzer capacity that was installed or at final investment decision, and close to 60% of manufacturing capacity.</li>
<li><strong>Europe's first large plants.</strong> The first large-scale European projects are expected to start up in 2026, though slow policy implementation is holding back further expansion.</li>
<li><strong>Africa.</strong> The IEA sees long-term potential but says projects there need a clear tie to wider development goals such as industry, food security and trade.</li>
</ul>
<p>The IEA also notes that conflict in the Middle East has disrupted production and trade of hydrogen-based products. You can read the agency's own overview on the <a href="https://www.iea.org/energy-system/fuels/hydrogen" rel="noopener noreferrer" target="_blank">IEA hydrogen page</a>.</p>
<h2 id="three-readers">Three illustrative readers, three different questions</h2>
<p>The scenarios below are made up to show how the same technology looks from different seats. They are not real people or projects.</p>
<h3>The fertilizer plant manager</h3>
<p>Her plant already makes hydrogen from gas to produce ammonia. Switching to green hydrogen needs no new chemistry, since the molecule is identical. Her question is purely commercial: can the premium be covered by a buyer, a policy or a carbon price? She is the textbook early customer, and her story continues under <a href="#best-uses">where hydrogen makes sense</a>.</p>
<h3>The city transport planner</h3>
<p>He is comparing hydrogen buses with battery buses. His answer depends on route length, depot space, local electricity prices, and whether a reliable hydrogen supply exists nearby. It is a case-by-case decision, and batteries often win on energy efficiency alone.</p>
<h3>The renewable developer</h3>
<p>She controls land with excellent sun and wind and wonders about exporting hydrogen. Cheap power is the start, not the finish: she still needs a buyer, a conversion route for shipping, and a port. Her path runs through <a href="#what-decides-cost">the cost levers</a> and <a href="#judge-announcements">the announcement checklist</a>.</p>
<h2 id="what-decides-cost">What decides the cost</h2>
<p>When people ask whether green hydrogen is "too expensive," they are usually pointing at one of three levers.</p>
<ol>
<li><strong>Electricity price.</strong> At roughly 52 kilowatt-hours per kilogram, every 10 USD per megawatt-hour of power adds about 0.52 USD to each kilogram.</li>
<li><strong>Utilization.</strong> An electrolyzer is an expensive machine. If it runs only when the sun shines, its capital cost is spread over fewer kilograms. Solar alone might run it a quarter of the year or so; a wind and solar mix more; steady grid power nearly all of it.</li>
<li><strong>Equipment cost and financing.</strong> The installed cost per kilowatt, plus the interest rate and project life, set the capital charge on every kilogram.</li>
</ol>
<p>The tension is that the cheapest electricity tends to come with low utilization, and the highest utilization tends to need pricier power. The table shows four illustrative setups using one formula and the same assumptions (1,500 USD per kW installed, 8% financing cost, 20-year life, 52 kWh per kg).</p>
<div style="overflow-x:auto; max-width:100%;">
<table style="width:100%; min-width:600px; border-collapse:collapse;">
<thead>
<tr>
<th style="border:1px solid #cfd8dc; padding:8px; text-align:left; background:#eceff1;">Illustrative setup</th>
<th style="border:1px solid #cfd8dc; padding:8px; text-align:left; background:#eceff1;">Power price (USD/MWh)</th>
<th style="border:1px solid #cfd8dc; padding:8px; text-align:left; background:#eceff1;">Utilization</th>
<th style="border:1px solid #cfd8dc; padding:8px; text-align:left; background:#eceff1;">Electricity per kg</th>
<th style="border:1px solid #cfd8dc; padding:8px; text-align:left; background:#eceff1;">Equipment per kg</th>
<th style="border:1px solid #cfd8dc; padding:8px; text-align:left; background:#eceff1;">Approx. total per kg</th>
</tr>
</thead>
<tbody>
<tr><td style="border:1px solid #cfd8dc; padding:8px;">Solar only</td><td style="border:1px solid #cfd8dc; padding:8px;">30</td><td style="border:1px solid #cfd8dc; padding:8px;">25%</td><td style="border:1px solid #cfd8dc; padding:8px;">1.56</td><td style="border:1px solid #cfd8dc; padding:8px;">3.63</td><td style="border:1px solid #cfd8dc; padding:8px;">5.19</td></tr>
<tr><td style="border:1px solid #cfd8dc; padding:8px;">Wind and solar mix</td><td style="border:1px solid #cfd8dc; padding:8px;">30</td><td style="border:1px solid #cfd8dc; padding:8px;">50%</td><td style="border:1px solid #cfd8dc; padding:8px;">1.56</td><td style="border:1px solid #cfd8dc; padding:8px;">1.81</td><td style="border:1px solid #cfd8dc; padding:8px;">3.37</td></tr>
<tr><td style="border:1px solid #cfd8dc; padding:8px;">Steady grid power</td><td style="border:1px solid #cfd8dc; padding:8px;">60</td><td style="border:1px solid #cfd8dc; padding:8px;">90%</td><td style="border:1px solid #cfd8dc; padding:8px;">3.12</td><td style="border:1px solid #cfd8dc; padding:8px;">1.01</td><td style="border:1px solid #cfd8dc; padding:8px;">4.13</td></tr>
<tr><td style="border:1px solid #cfd8dc; padding:8px;">Dream case: cheap and steady</td><td style="border:1px solid #cfd8dc; padding:8px;">30</td><td style="border:1px solid #cfd8dc; padding:8px;">90%</td><td style="border:1px solid #cfd8dc; padding:8px;">1.56</td><td style="border:1px solid #cfd8dc; padding:8px;">1.01</td><td style="border:1px solid #cfd8dc; padding:8px;">2.57</td></tr>
</tbody>
</table>
</div>
<p><em>Illustrative arithmetic only, not real project data. It leaves out water, operation and maintenance, stack replacement, compression, storage, transport and subsidies.</em></p>
<p>Read the first and fourth rows side by side. The same cheap electricity gives an outcome twice as expensive when the machine sits idle three quarters of the year. That is the hidden reason "cheapest solar in the world" does not automatically mean cheapest hydrogen.</p>
<p>For comparison, published estimates for today's gray hydrogen often fall somewhere around 1 to 3 USD per kilogram depending on regional gas prices, while published estimates for green hydrogen are commonly higher, from a few dollars to well above 5 USD per kilogram depending on the market. Sources disagree on exact figures, which is itself a sign of how project-specific the cost is.</p>
<h2 id="try-it">Try it: estimate a cost per kilogram</h2>
<p>Change the numbers below to see how electricity price, utilization and equipment cost move the result. The starting values are editable examples, not real data.</p>
<div class="tool-box" id="tool-box">
<style>
.tool-box{width:100%;max-width:100%;box-sizing:border-box;border:1px solid #cfd8dc;border-radius:10px;padding:16px;margin:16px 0;background:#f7fafb;color:#1b2a33;font-family:inherit}
.tool-box *{box-sizing:border-box}
.tool-row{margin:10px 0}
.tool-label{display:block;font-size:15px;font-weight:700;margin-bottom:4px}
.tool-input{width:100%;max-width:100%;font-size:16px;padding:10px 12px;border:1px solid #90a4ae;border-radius:8px;background:#ffffff;color:#1b2a33}
.tool-btn{width:100%;max-width:100%;font-size:16px;padding:12px 16px;border:0;border-radius:8px;background:#0b5c7a;color:#ffffff;cursor:pointer;margin-top:8px}
.tool-result{margin-top:12px;font-size:16px;line-height:1.5;min-height:1.5em;font-weight:700}
.tool-note{font-size:14px;line-height:1.4;margin-top:8px;color:#37474f}
</style>
<div class="tool-row">
<label class="tool-label" for="tool-price">Electricity price (USD per MWh)</label>
<input class="tool-input" type="number" inputmode="decimal" step="any" min="0" id="tool-price" value="40">
</div>
<div class="tool-row">
<label class="tool-label" for="tool-kwh">Electricity needed per kg of hydrogen (kWh)</label>
<input class="tool-input" type="number" inputmode="decimal" step="any" min="1" id="tool-kwh" value="52">
</div>
<div class="tool-row">
<label class="tool-label" for="tool-cf">Share of the year the electrolyzer runs (%)</label>
<input class="tool-input" type="number" inputmode="decimal" step="any" min="1" max="100" id="tool-cf" value="50">
</div>
<div class="tool-row">
<label class="tool-label" for="tool-capex">Installed system cost (USD per kW)</label>
<input class="tool-input" type="number" inputmode="decimal" step="any" min="0" id="tool-capex" value="1500">
</div>
<div class="tool-row">
<label class="tool-label" for="tool-rate">Financing cost per year (%)</label>
<input class="tool-input" type="number" inputmode="decimal" step="any" min="0" max="50" id="tool-rate" value="8">
</div>
<button type="button" class="tool-btn" id="tool-calc">Estimate cost per kg</button>
<div class="tool-result" id="tool-out" aria-live="polite"></div>
<div class="tool-note">Estimate only. Assumes a 20-year life and excludes water, operation and maintenance, stack replacement, compression, storage, transport and any subsidies. Not investment advice.</div>
<noscript>This calculator needs JavaScript to run. The table above shows the same math for four fixed examples.</noscript>
<script>
(function () {
var btn = document.getElementById('tool-calc');
var out = document.getElementById('tool-out');
function val(id) {
return parseFloat(document.getElementById(id).value);
}
function bad(v) {
return !isFinite(v) || Math.max(0, v) !== v;
}
btn.addEventListener('click', function () {
var price = val('tool-price');
var kwh = val('tool-kwh');
var cf = val('tool-cf');
var capex = val('tool-capex');
var rate = val('tool-rate');
out.textContent = '';
if (bad(price) || bad(kwh) || bad(cf) || bad(capex) || bad(rate)) {
out.textContent = 'Please enter valid numbers that are zero or higher.';
return;
}
if (Math.max(1, kwh) !== kwh) {
out.textContent = 'Electricity per kg must be at least 1 kWh.';
return;
}
if (Math.max(1, cf) !== cf) {
out.textContent = 'Running share must be between 1 and 100 percent.';
return;
}
if (Math.min(100, cf) !== cf) {
out.textContent = 'Running share must be between 1 and 100 percent.';
return;
}
if (Math.min(50, rate) !== rate) {
out.textContent = 'Financing cost must be 50 percent or lower.';
return;
}
var years = 20;
var r = rate / 100;
var crf = 1 / years;
if (r !== 0) {
var g = Math.pow(1 + r, years);
crf = r * g / (g - 1);
}
var elec = price / 1000 * kwh;
var kgPerKw = 8760 * (cf / 100) / kwh;
var equip = capex * crf / kgPerKw;
var total = elec + equip;
out.textContent = 'About ' + total.toFixed(2) + ' USD per kg (electricity ' + elec.toFixed(2) + ', equipment ' + equip.toFixed(2) + ').';
});
})();
</script>
</div>
<p>Try dropping the running share from 50% to 25% and watch the equipment share double. Then raise it to 90% and see how much a steady power supply is worth. This is the quickest way to see why developers care so much about firm, not just cheap, electricity.</p>
<h2 id="why-slow">Why scale-up is slower than the headlines</h2>
<p>The cost gap is the visible problem. Several others sit behind it.</p>
<h3>1. Buyers are not signing</h3>
<p>A producer needs a long-term contract at a known price to borrow money. A buyer facing a premium over gas-based hydrogen has little reason to sign unless a rule, subsidy or carbon price makes it worthwhile. The IEA calls this lack of demand the crucial missing piece.</p>
<h3>2. Policy is uncertain</h3>
<p>Incentives and sourcing rules have shifted or been slow to implement in several regions. Developers cannot finance a 20-year asset against rules that might change in two.</p>
<h3>3. Hydrogen is awkward to move</h3>
<p>It is the lightest molecule, so a given volume carries relatively little energy. Moving it as a gas needs dedicated pipelines or compression; moving it by ship usually means converting it to something like ammonia, which adds cost and energy losses. Large-scale storage, such as in salt caverns, depends on suitable geology.</p>
<h3>4. Electricity must be genuinely clean and available</h3>
<p>Green hydrogen competes for renewable power with everything else that is electrifying. Using that power directly is usually more efficient than turning it into hydrogen.</p>
<h3>5. Equipment costs have not fallen on schedule</h3>
<p>Reporting on the 2025 IEA review noted that higher electrolyzer prices weighed on projects, while falling natural gas prices at that time widened the gap in favor of fossil hydrogen. Cheaper, mass-produced systems, with China as the leading manufacturer, may help over time, but the pace is uncertain.</p>
<h3>6. Water and siting matter locally</h3>
<p>Water needs are often manageable in volume terms compared with the electricity requirement, but they matter in dry regions, where desalination may be part of the project.</p>
<h2 id="best-uses">Where hydrogen makes sense and where it does not</h2>
<p>Hydrogen is not equally useful everywhere. The table gives a general view of how analysts tend to see each use. It is not a forecast, and individual cases will differ.</p>
<div style="overflow-x:auto; max-width:100%;">
<table style="width:100%; min-width:600px; border-collapse:collapse;">
<thead>
<tr>
<th style="border:1px solid #cfd8dc; padding:8px; text-align:left; background:#eceff1;">Use</th>
<th style="border:1px solid #cfd8dc; padding:8px; text-align:left; background:#eceff1;">Why hydrogen is considered</th>
<th style="border:1px solid #cfd8dc; padding:8px; text-align:left; background:#eceff1;">Main competing option</th>
<th style="border:1px solid #cfd8dc; padding:8px; text-align:left; background:#eceff1;">General outlook</th>
</tr>
</thead>
<tbody>
<tr><td style="border:1px solid #cfd8dc; padding:8px;">Refining, ammonia and methanol</td><td style="border:1px solid #cfd8dc; padding:8px;">Same molecule already used, so plants can switch supply</td><td style="border:1px solid #cfd8dc; padding:8px;">Fossil hydrogen, possibly with carbon capture</td><td style="border:1px solid #cfd8dc; padding:8px;">Most direct route to early volume; the question is who pays the premium</td></tr>
<tr><td style="border:1px solid #cfd8dc; padding:8px;">Steelmaking</td><td style="border:1px solid #cfd8dc; padding:8px;">Can replace coal in some ore-based routes</td><td style="border:1px solid #cfd8dc; padding:8px;">Scrap-based electric furnaces, carbon capture</td><td style="border:1px solid #cfd8dc; padding:8px;">Promising where ore-based steel is needed, but depends on secure supply</td></tr>
<tr><td style="border:1px solid #cfd8dc; padding:8px;">Shipping and aviation fuels</td><td style="border:1px solid #cfd8dc; padding:8px;">Few easy alternatives for long distances</td><td style="border:1px solid #cfd8dc; padding:8px;">Biofuels, efficiency measures</td><td style="border:1px solid #cfd8dc; padding:8px;">Needed in principle; costly because of extra conversion steps</td></tr>
<tr><td style="border:1px solid #cfd8dc; padding:8px;">Heavy road transport</td><td style="border:1px solid #cfd8dc; padding:8px;">Fast refueling and long range</td><td style="border:1px solid #cfd8dc; padding:8px;">Battery-electric trucks</td><td style="border:1px solid #cfd8dc; padding:8px;">Contested; depends on duty cycle and infrastructure</td></tr>
<tr><td style="border:1px solid #cfd8dc; padding:8px;">Long-duration power storage</td><td style="border:1px solid #cfd8dc; padding:8px;">Can store energy for weeks or seasons</td><td style="border:1px solid #cfd8dc; padding:8px;">Batteries for short periods, other firm power</td><td style="border:1px solid #cfd8dc; padding:8px;">Niche, but potentially valuable in grids dominated by renewables</td></tr>
<tr><td style="border:1px solid #cfd8dc; padding:8px;">Passenger cars and home heating</td><td style="border:1px solid #cfd8dc; padding:8px;">Familiar fueling idea</td><td style="border:1px solid #cfd8dc; padding:8px;">Batteries and heat pumps using electricity directly</td><td style="border:1px solid #cfd8dc; padding:8px;">Generally seen as weak, since direct electricity needs far less energy per unit of service</td></tr>
</tbody>
</table>
</div>
<p>The pattern is consistent: hydrogen has the strongest case where it replaces hydrogen that is already in use, or where a molecule rather than electricity is truly required. It has the weakest case where electricity can do the job directly.</p>
<h2 id="judge-announcements">How to judge a green hydrogen announcement</h2>
<p>Big headline capacity figures are easy to publish and hard to deliver, which is why the project pipeline keeps being revised down. Five questions separate a plan from a press release.</p>
<ol>
<li><strong>Is there a signed buyer, and at what price?</strong> An offtake agreement matters more than a capacity target.</li>
<li><strong>Has it reached a final investment decision, or is it only announced?</strong> Announced, under construction and operating are very different stages.</li>
<li><strong>Where does the power come from, and how many hours will the electrolyzer run?</strong> Use the calculator above to see what that implies.</li>
<li><strong>How does the hydrogen reach the user?</strong> On-site use, a pipeline, or conversion to ammonia each change the cost and the carbon footprint.</li>
<li><strong>What happens if subsidies or rules change?</strong> A project that only works with one specific incentive is carrying policy risk.</li>
</ol>
<h2 id="can-it-scale">So, can it scale?</h2>
<p>Technically, yes: electrolysis is proven, manufacturers are expanding, and the IEA still expects production to keep growing. Commercially, the evidence so far points to slower, more selective scaling than the early forecasts assumed. The most likely path is not "hydrogen everywhere" but hydrogen first in the industries that already depend on it, then in a few hard-to-electrify sectors, with growth tied to where cheap and steady clean power meets a committed buyer.</p>
<p>Several things would change the picture: sustained falls in equipment cost, firm low-cost renewable supply, clear and stable demand policies, and visible final investment decisions turning into operating plants. Forecasts also disagree about when green hydrogen could match fossil hydrogen on cost in the best locations, with some analysts pointing to the end of this decade and others expecting later. Treat any single date with caution.</p>
<h2 id="faq">Questions people ask</h2>
<h3>Is green hydrogen the same as "low-emissions" or "clean" hydrogen?</h3>
<p>No. Low-emissions hydrogen is the broader category. It includes green hydrogen from electrolysis and also blue hydrogen from fossil fuels with carbon capture. Always check which one a statistic or announcement is actually about.</p>
<h3>Does making green hydrogen use too much water?</h3>
<p>The chemistry needs about 9 kilograms of water per kilogram of hydrogen at minimum, and real plants use more. In many analyses the volume is manageable relative to the electricity challenge, but it can be a real constraint in water-stressed regions, where desalination or other sources need to be planned from the start.</p>
<h3>When will green hydrogen be cheaper than gray hydrogen?</h3>
<p>There is no agreed date. It depends on local power prices, equipment costs, gas prices, carbon pricing and how many hours the electrolyzer runs. Some analyses see parity in the best locations toward the end of this decade, while the recent project cancellations suggest the timeline may stretch. The calculator above shows which assumptions matter most.</p>
<h2 id="closing">Back to the quiet meeting room</h2>
<p>The buyer's question, what does it cost per kilogram, delivered to my plant, is not an obstacle to the story. It is the story. Green hydrogen scales wherever someone can answer that question with a credible price, a firm electricity supply and a route to the customer. Where those are missing, the banner on the fence stays just a banner. A good next step is to take one announcement you have read about and run it through the five questions above.</p>
<p><small>Figures in this article are drawn from the IEA's Global Hydrogen Review editions and press coverage of them, and from general industry cost ranges, which vary by source and change quickly. Check the latest IEA publication before relying on any number for a decision. This article is general information, not engineering, investment or policy advice.</small></p>
<h2 id="read-next">Read next</h2>
<!-- INTERNAL LINK: Blue vs green hydrogen: what is the real difference? -->
<!-- INTERNAL LINK: How electrolyzers work: alkaline, PEM and solid oxide compared -->
<!-- INTERNAL LINK: Green ammonia explained: fertilizer, shipping fuel and exports -->