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Hydrogen is potentially the energy carrier of the future, and by transforming electricity to hydrogen through water electrolysis, energy can be stored for later use. Hydrogen is an energy carrier, meaning that it can be used to store energy, making it particularly suitable for use in renewable energy systems.

The excess wind energy or solar energy produced under good conditions can be used to produce hydrogen, which can be stored and subsequently converted back into electricity when needed in calm weather or after dark.

Renewable systems based on hydrogen as an energy carrier will be especially useful in areas with access to abundant renewable energy resources, with problems producing enough electricity or with insufficient infrastructure.

Alternatively, the hydrogen can be used to feed directly the natural gas feedstock, go through methanisation process to produce synthetic methane, or be used as fuel for hydrogen vehicles at hydrogen fuelling stations.

power-to-gas

See Links
http://www.hydrogenics.com/about-the-company/news-updates/2014/02/18/excess-wind-power-turned-into-gas-in-denmark-using-hydrogenics-technology
http://www.hydrogenics.com/about-the-company/news-updates/2014/01/16/Hydrogenics-Awarded-Energy-Storage-Contract