Power-to-gas (often abbreviated P2G) is a technology that uses electric power to produce a gaseous fuel.
Most P2G systems use electrolysis to produce hydrogen. The hydrogen can be used directly, or further steps (known as two-stage P2G systems) may convert the hydrogen into syngas, methane, or LPG. Single-stage P2G systems to produce methane also exist, such as reversible solid oxide cell (rSOC) technology.
Produced gas, just like natural gas or industrially produced hydrogen or methane, is a commodity and may be used as such through existing infrastructure (pipelines and gas storage facilities), including back to power at a loss. However, provided the power comes from renewable energy, it can be touted as a carbon-neutral fuel, renewable, and a way to store variable renewable energy.