Green hydrogen is hydrogen made by splitting water with renewable electricity, producing a fuel that releases no carbon dioxide when used. It's genuinely useful for some hard-to-decarbonize jobs, like making fertilizer, refining and possibly steel, but it's expensive and loses a lot of energy along the way. In Canada, early enthusiasm for large export projects has cooled, and the realistic role for hydrogen is narrower than the hype once suggested — and it's unlikely to heat most homes.
Key takeaways
- Hydrogen is an energy carrier, not an energy source: it takes more energy to make than you get back.
- "Green" hydrogen comes from renewable-powered electrolysis; most hydrogen today is made from natural gas.
- The best uses are where hydrogen is already needed or where direct electrification is impractical, such as fertilizer, refining and some heavy industry.
- Several large Canadian green hydrogen export proposals, especially in Newfoundland and Labrador, have been cancelled or stalled.
- For home heating and passenger cars, heat pumps and battery EVs are generally far more efficient.
The colours of hydrogen
Hydrogen is colourless, but the industry uses colours to describe how it's made:
| Type | How it's produced | Emissions |
|---|---|---|
| Grey | From natural gas through steam methane reforming | High CO₂ emissions |
| Blue | Same as grey, with carbon capture and storage | Lower; depends on capture rate and methane leaks |
| Green | Electrolysis of water using renewable electricity | Near zero, if the power is truly renewable |
| Pink / purple | Electrolysis using nuclear power | Near zero |
Canada is already a significant hydrogen producer, but almost all of it is grey hydrogen used in oil refining, upgrading and fertilizer production. Alberta is home to large blue hydrogen proposals, such as the Air Products complex near Edmonton, which has faced delays.
How green hydrogen is made
An electrolyser uses electricity to split water (H₂O) into hydrogen and oxygen. The hydrogen can be compressed, liquefied, piped or turned into other fuels like ammonia. When hydrogen is later used in a fuel cell or burned, it combines with oxygen again and releases mostly water.
The catch is efficiency. Each conversion step loses energy:
- Electrolysis typically loses roughly a quarter to a third of the input electricity.
- Compressing, liquefying or converting hydrogen to ammonia loses more.
- Turning hydrogen back into electricity in a fuel cell or turbine loses more again.
Taken together, converting electricity to hydrogen and back to electricity often returns only around 30–40% of the original energy. By comparison, charging and discharging a battery typically returns 85–90%. Our future of energy page puts these trade-offs in context.
Where hydrogen makes sense
The strongest cases are where there's no better option:
- Fertilizer and chemicals: Ammonia production already uses huge amounts of hydrogen. Swapping grey for green hydrogen cuts emissions without changing the end product.
- Oil refining: Refineries use hydrogen today; cleaner hydrogen lowers their emissions.
- Steelmaking: Hydrogen can replace coal in some steel processes.
- Long-haul shipping and aviation fuels: Hydrogen-derived fuels like ammonia or synthetic fuels may play a role where batteries are too heavy.
- Long-duration seasonal storage: In theory, surplus summer renewable power could be stored as hydrogen for winter, though costs are high.
Where it usually doesn't
| Use | Hydrogen option | Usually better option |
|---|---|---|
| Home heating | Hydrogen boiler or blending into gas lines | Heat pump — several times more efficient |
| Passenger cars | Fuel cell vehicle | Battery electric vehicle |
| Short-duration grid storage | Hydrogen turbine | Batteries |
| Light-duty delivery | Fuel cell van | Battery van |
A heat pump can deliver two to three or more units of heat per unit of electricity, while using that same electricity to make hydrogen and burn it for heat delivers well under one. That's why most independent analyses find hydrogen is a poor fit for home heating. Our geothermal and heat pump page explains how heat pumps achieve that efficiency.
Some gas utilities have tested blending small amounts of hydrogen into natural gas networks. Blends are limited because hydrogen can affect pipes and appliances, and the emission reductions at low blend levels are modest.
Canada's hydrogen ambitions — and the reality check
Canada released a national hydrogen strategy in 2020 and introduced a federal clean hydrogen investment tax credit for businesses, with rates tied to how low-carbon the hydrogen is. The vision included domestic use and exports, especially to Europe.
Atlantic export projects
Newfoundland and Labrador, with strong wind resources and deep-water ports, attracted proposals for multi-billion-dollar wind-to-hydrogen export projects. By 2026, most had stalled. The province cancelled Crown land reservations for several major proposals, including World Energy GH2's project on the west coast, after developers failed to meet requirements. Another proponent withdrew to pursue a wind-only project. Only a couple of projects remained in active development, both still needing customers and financing.
The main obstacles have been:
- High production costs compared with grey hydrogen
- Difficulty signing long-term buyers ("offtake" agreements)
- The cost and complexity of shipping hydrogen or ammonia overseas
- Rising interest rates and construction costs
Domestic opportunities
Hydrogen's more realistic near-term role may be closer to home: cleaning up existing hydrogen use in refining, upgrading and fertilizer, and supplying industrial clusters, especially in Alberta. Some of the wind capacity once proposed for hydrogen may instead feed regional grids. See our wind page for more on Atlantic Canada's wind potential.
Frequently asked questions
Will hydrogen replace natural gas for home heating in Canada?
It's unlikely for most homes. Making and delivering hydrogen is costly and inefficient compared with using electricity directly in a heat pump, and existing pipes and appliances can only handle limited hydrogen blends.
Is green hydrogen truly zero-emission?
It can be close to zero if the electrolyser runs on genuinely additional renewable or other clean electricity. If it draws from a fossil-heavy grid, the hydrogen can have a large carbon footprint.
Should I buy a hydrogen car?
For most Canadians, no. Hydrogen fuelling stations are very rare in Canada, and battery electric vehicles are more efficient and widely supported by charging infrastructure.
The bottom line
Green hydrogen is a real tool, not a magic one. It shines in industries that already depend on hydrogen and in a few sectors where batteries and wires can't easily reach. Canada's early export dreams have run into hard economics, but cleaner hydrogen for domestic industry remains a credible goal. For your home and car, electricity used directly — through heat pumps and EVs — is almost always the better bet.
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