While hydrogen energy holds promise, the fact is that hydrogen is an energy not a primary energy

The right answer is energy carrier / not a primary energy source

Hydrogen is not strictly speaking a source of energy, but a vector, just like electricity: it is used to transport the energy produced by a primary source (oil, uranium) to the users. Used in a fuel cell, its only waste is water.

Answer;

Carrier; source

While hydrogen energy holds promise, the fact is that hydrogen is an energy carrier, not a primary energy source.

Explanation;

Hydrogen can be considered as a clean energy carrier similar to electricity.

Hydrogen can be produced from various domestic resources such as renewable energy and nuclear energy.

It is considered as a secondary source of energy, commonly referred to as an energy carrier. Energy carriers are used to move, store and deliver energy in a form that can be easily used.

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