Most reticulated gas networks use the pipe network itself as the storage facility. eg: https://en.wikipedia.org/wiki/Natural_gas_storage#Pipeline_capacity http

Most reticulated gas networks use the pipe network itself as the storage facility. eg: https://en.wikipedia.org/wiki/Natural_gas_storage#Pipeline_capacity https://en.wikipedia.org/wiki/Natural_gas_storage#Pipeline_c... There may be more than a day of capacity just in the pipe network.