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System of generation and energy storage in the form of hydrogen

The facility is located at the Sotavento Experimental Wind Farm, west of the main building. The main equipment that it is composed of is located in containers provided for this purpose. This plant comes from the need to explore energy storage systems and their potential linked to the management of renewable energies, as well as to analyze the operation and efficiency of a real plant connected to a wind farm. The objective was to obtain knowledge of the operation and the problems in a facility of this nature, with a view to transferring this knowledge and experience to future energy management plants on a larger scale. The facility has been developed jointly by the Ministry of Economy and Industry of the Government of Galicia, Natural Gas and the Sotavento Galicia Foundation.

System of generation and energy storage in the form of hydrogen (1)

The hydrogen plant has been operated using different strategies, all of which use electric power generated at the Sotavento Experimental Wind Farm. In a general and descriptive way, the functioning of the plant consists of a first phase of hydrogen generation, its subsequent storage and finally its combustion. The main equipment that it integrates are:

  • Electrolyser. This device is produces the decoupling of the water molecule into its constituent elements, oxygen and hydrogen. The maximum generation capacity of the equipment is 60 Nm3/h of hydrogen (under normal conditions of pressure and temperature, and with a purity of 99.99%). The oxygen generated in the process is emitted into the atmosphere.
  • Compressor. Equipment raising the pressure of the hydrogen generated up to 200 bar for its storage.
  • Hydrogen storage system. Infrastructures that enable the build-up of generated hydrogen. The maximum storage capacity of the plant is 1,725 m3.
  • Moto generator. Equipment in which electrical energy is generated as a product of the combustion of hydrogen. The electric power of the motor generator is 55 kW.

At the present time the project is complete. The technical characteristics of the equipment comprising the installation are:


Make and Model Hydrogenics HysSTAT-A 1000Q-60-10
Number of stacks/ cells 4 stacks / 90 cells per stack
Maximum hydrogen flow 60 Nm3/h
Output pressure 6-10 Bar
Efficiency of the electrolytic cells 4.2 kWh/Nm3
Maximum electrical power consumption 288 kW
Demineralised water consumption < 1 l/Nm3 of H2
Electrolyte type Dilution of KOH in water at 30% v/v
Amount of electrolyte 650 l
Total weight in operation 4,200 kg


Make and Model Bauer HFS 15.4-13-DUO II
Suction pressure 2.0-4.0 Bar
Discharge pressure 200 Bar
Vacuum flow 18 Nm3/h at 2 Bar 30.9 Nm3/h at 4 Bar
Compression stages 3
Number of cylinders 4
Electrical power consumption 7.4 kW at 2 Bar 12.4 kW at 4 Bar


Manufacturer Continental Energy Sistems
Mechanical engine power 60 kW
Fuel consumption 198 kW
Configuration 6 cylinders in a line
Cylinder capacity 11,700 cm3
Cycle 4 times
Speed 1,500 rpm
Maximum hydrogen flow 70 Nm3/h
Supply pressure 28-60 mBar
Generator electrical power 55 kW
Generator efficiency 91-93%

Demo application

Sotavento has a demo application, visual and interactive, allowing you to view the system data in real time and perform multiple calculations and extrapolations.

System of generation and energy storage in the form of hydrogen (2)