Hydrogen Energy Storage
We know hydrogen is the simplest and lightest and the most abundant element in nature. Unfortunately, The energy type is not available directly in the environment, we have to process it before using it. The reason is that hydrogen is lighter than air and rise towards the atmosphere. Natural Hydrogen is in combination with complex elements such as coal, water, and oil.
It is the process of converting electrical energy into hydrogen by electrolysis. Also known as PG2 (power-to-gas). The purpose of this process is to separate the hydrogen from water using electric power to capture and store the raw hydrogen.
Advantages and Disadvantages of Hydrogen Energy
How Is Hydrogen Stored?
The most common form of storage of hydrogen is storing as compressed gas. Hydrogen is storable as a cryogenic liquid at low temperatures. Besides, in some cases, hydrogen can be bonded to a solid material and separated upon request.
There are also chemicals such as liquid organic hydrogen carriers and ammonia that can function as molecular hydrogen carriers for long-distance transport.
The benefit of Hydrogen Energy Storage
In high penetration of renewable energy, seasonal storage is essential. Resources such as solar, wind and hydro vary significantly in production from one season to another. Hydrogen permits you to do seasonal energy shifting by solely “banking” hydrogen during seasons of surplus and then sending the energy during seasons of famine.
Is Hydrogen Energy Storage Only For Renewable Energy Sources?
Actually no, hydrogen energy storage can be used whenever you want to store low-value electrons and use them for high-value applications. For instance, you may want to save some off-peak grid power and then use that energy during a period of high energy consumption to reduce demand charges.
Is Hydrogen A Renewable Energy Source?
Contrary to popular belief, hydrogen is not an energy source but an energy carrier. Energy sources can be both renewable and non-renewable. However, energy carriers are only renewable if they produced from renewable energy sources.
Therefore, if hydrogen produced from natural gas, the most common source of hydrogen, it is not renewable. It cannot be renewable if we can’t produce it from coal or oil gasification. However, if hydrogen produced from the biomass gasification process, then it can be renewable energy.
If hydrogen produced by electrolysis, electricity is just another energy carrier and we need to look at where the electricity produced. Hydrogen-based electrolysis from fossil fuel sources is not a renewable energy source. If the power were from solar or wind, it would be renewable.