Power to gas © Siemens Stiftung 2017 CC BY-SA 4.0 international

Power to gas


Labeled graphic:
The existing natural gas network can be used for distribution and storage of gas produced through the conversion of excess wind and solar electricity to hydrogen or even methane (power to gas).

English, Spanish (CREA), German
Image (121.2 kByte)
Surplus electric power can be used for the electrolysis (electrochemical decomposition) of water (H2O) to hydrogen gas (H2) and oxygen gas (O2). The hydrogen gas is then pressurized or liquefied and stored in tanks. When electric power is needed, the hydrogen is converted back to electric power by combustion via fuel cells, gas turbines, diesel engines, or Stirling engines. Alternatively, hydrogen gas can also be stored in the natural gas network up to approximately 5 percent to 10 percent. If the share of renewable electricity grows, methane (CH4 = “natural gas”) is produced from H2 and CO2 through multistep catalytic reactions and stored in the gas network. The necessary chemistry and technology are tried and tested; in fact, even during World War II, Germany produced synthetic gasoline in a similar manner. A very efficient and extensive distribution and storage infrastructure is already available as the natural gas network and the existing large-scale natural gas stores (capacity of up to four months). The existing gas turbine power plants could now also be operated using only renewable energy sources. The hydrogen and methane production and electric power generation by gas turbines could take place at any location in the power supply grid. This flexibility means that the power supply grid doesn’t need to be expanded to such a great extent.
Chemistry; Physics; Technology
Grade 7 to 9; Grade 10 to 13
Middle/high school; Vocational training
Energy; Energy supply; Renewable energy
Siemens Stiftung Media Portal
MediaHouse GmbH
© Siemens Stiftung 2017
Stay up-to-date!

About four times a year, we inform you about new media on this portal as well as current studies and events related to OER and STEM.

Media Portal newsletter – register now

About four times a year, we inform you about new media on this portal as well as current studies and events related to OER and STEM.

*Required fields


Liebe Nutzerin, lieber Nutzer,
El Portal de Medios – das spanische Medienportal – ist umgezogen und heißt nun CREA.
Auf CREA finden Sie weiterhin hochwertige Medien für den MINT-Unterricht und vieles mehr.

Dear User,
El Portal de Medios - the Spanish Media Portal - has moved and is now called CREA.
On CREA, you will continue to find high-quality media for STEM education and much more.

Estimado usuario, estimada usuaria,
El Portal de Medios – en español – ha sido trasladado y ahora se llama CREA.
En CREA seguirá encontrando medios de alta calidad para la enseñanza de STEM, y mucho más.

Zu CREA wechseln / Switch to CREA / Cambiar a CREA
CREA - El Portal de Medios para la Enseñanza STEM

Hierbleiben / Stay here / Quédate aquí:
Fenster schließen / Close window / Cerrar ventana