Regardless of its origin, hydrogen offers a level of flexibility that makes it useful for storing and recovering excess generated energy, especially energy from renewable sources, and acts as a buffer to match supply with demand.

Hydrogen: key to the storage and recovery of energy from renewable sources

Hydrogen, a mean to decarbonize all energy uses at the heart of territories

Why do we talk in terms of green hydrogen?

By using electricity generated from renewable sources, such as wind power and solar power (aka ‘ green electricity’), the resulting hydrogen is known as ‘green hydrogen’.

What actually is electrolysis?

The electrolysis of water involves using electrical energy to separate water into gaseous hydrogen (H2) and oxygen (O2), thereby converting electrical energy into chemical energy. The hydrogen produced as a result of the electrolysis of water effectively converts surplus electricity. This hydrogen can then be stored or transported. It can be used directly (particularly as a fuel), injected into the natural gas supply network, or converted back to electricity in a fuel cell.

Some key figures to remember

3 X: Green hydrogen contains up to 3 times more energy per unit mass than diesel, and 2½ times more than natural gas.

X 10: According to the consulting firm McKinsey, annual demand for hydrogen could be 10 times higher by 2050.

6 metric gigatons: According to the Hydrogen, Scaling up study conducted by McKinsey for the Hydrogen Council, hydrogen could reduce annual CO2 emissions by around 6 metric gigatons, compared with current levels.

10 to 15 million: cars and 500,000 trucks could be running on hydrogen by 2030

Throughout the month of June, we invite you to find out more about hydrogen, its potential and the challenges involved in its development. You’ll be able to find our series of articles and interviews in a hydrogen special report on ENGIE.com.