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Power to Gas (often abbreviated P2G) is a technology that uses electric power to produce gas eous fuel. When using excess energy from wind generation, the concept is sometimes called windgas. Most P2G systems use electrolysis to produce hydrogen. Hydrogen can be used directly, or other steps (known as two-stage P2G systems) may convert hydrogen into six-gas, methane or LPG. Single-phase P2G system for methane production also exists, such as resoc technology. Gas can be used as a chemical feedstock, or converted back into electricity using conventional generators such as gas turbines. The use of energy to gas allows energy to be stored from electricity and transported in compressed gas, and often uses existing infrastructure to transport and store natural gas in the long term. P2G is often considered a promising technology for storing seasonal renewable energy. energy systems can be deployed to gas as aid for wind or solar power plants. Excess or unnecessary power for the peak generated by wind generators or solar arrays can then be used hours, days or months later to produce electricity to the electric grid. Before switching to natural gas, German gas networks were operated using gas, which consisted of hydrogen for 50-60%. The storage capacity of the German natural gas network is more than 200,000 GWh which is enough for several months of energy needs. By comparison, the capacity of all German power plants pumped is only about 40 gigawatt hours. Germany's storage/recovery capacity requirements are estimated at 16 GW in 2023, 80 GW in 2033 and 130 GW in 2050. Storage costs per kilowatt hour are estimated at EUR 0.10 for hydrogen and 0.15 euros for methane. The current natural gas transportation infrastructure transports huge amounts of long-distance gas that use pipelines profitably. It is now profitable to ship natural gas between continents using LNG tankers. Energy is transported through the gas grid with far less losses (