Green hydrogen is gaining global momentum as a clean fuel that can decarbonize power, transport, and industry. But what exactly is it, and how is it made? This article breaks down the basics of green hydrogen production through electrolysis—a process that splits water into clean fuel and pure oxygen using renewable energy.
What Is Green Hydrogen?Green hydrogen is hydrogen produced with zero carbon emissions, using electricity from renewable sources like solar, wind, or hydropower to extract hydrogen from water (H₂O). The key difference between green hydrogen and other types lies in the source of energy used and its environmental impact:
Type of HydrogenSourceEmissions
Grey Hydrogen = Natural gas (steam methane reforming) => High CO₂ emissions
Blue Hydrogen = Natural gas + carbon capture => Low(er) emissions
Green Hydrogen = Renewable electricity + water => Zero emissions
How Electrolysis WorksElectrolysis is the process of using electricity to split water molecules (H₂O) into hydrogen (H₂) and oxygen (O₂). It takes place inside an electrolyzer, which is the core device in green hydrogen production.
There are three main types of electrolyzers:
2H₂O → 2H₂ + O₂ (with renewable electricity)
The resulting hydrogen gas is captured, compressed, and stored for later use. The oxygen is often vented or can be captured for industrial or medical use.
What Can Green Hydrogen Be Used For?
Why This Matters for the PhilippinesThe Philippines has abundant renewable energy potential—but intermittent supply remains a challenge. Green hydrogen offers a way to store and transport renewable power, enabling energy independence for islands, lowering reliance on imported fossil fuels, and supporting resilient microgrids.
It’s also a pathway to participate in emerging hydrogen trade markets and develop green industrial clusters near ports or RE zones.
What Is Green Hydrogen?Green hydrogen is hydrogen produced with zero carbon emissions, using electricity from renewable sources like solar, wind, or hydropower to extract hydrogen from water (H₂O). The key difference between green hydrogen and other types lies in the source of energy used and its environmental impact:
Type of HydrogenSourceEmissions
Grey Hydrogen = Natural gas (steam methane reforming) => High CO₂ emissions
Blue Hydrogen = Natural gas + carbon capture => Low(er) emissions
Green Hydrogen = Renewable electricity + water => Zero emissions
How Electrolysis WorksElectrolysis is the process of using electricity to split water molecules (H₂O) into hydrogen (H₂) and oxygen (O₂). It takes place inside an electrolyzer, which is the core device in green hydrogen production.
There are three main types of electrolyzers:
- Alkaline Electrolyzers (AEL) – commercially mature and cost-effective.
- Proton Exchange Membrane (PEM) – compact and responsive; good for variable renewable energy.
- Solid Oxide Electrolyzers (SOEC) – high efficiency; still emerging.
2H₂O → 2H₂ + O₂ (with renewable electricity)
The resulting hydrogen gas is captured, compressed, and stored for later use. The oxygen is often vented or can be captured for industrial or medical use.
What Can Green Hydrogen Be Used For?
- Electricity generation – via hydrogen fuel cells or turbine blending
- Industrial feedstock – in steel, ammonia, cement production
- Transport fuel – for buses, trucks, ships, and aircraft
- Long-duration storage – bridging seasonal gaps in renewable supply
Why This Matters for the PhilippinesThe Philippines has abundant renewable energy potential—but intermittent supply remains a challenge. Green hydrogen offers a way to store and transport renewable power, enabling energy independence for islands, lowering reliance on imported fossil fuels, and supporting resilient microgrids.
It’s also a pathway to participate in emerging hydrogen trade markets and develop green industrial clusters near ports or RE zones.
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