#P2G

由於風力變化和晝夜交替，風力和太陽能發電呈現出顯著的隨機性、間歇性和波動性的特點，導致其與用戶相對固定的用電需要難以匹配。因此，人們希望找到將電能儲存起來的辦法，即在電力富餘的時候將其存儲，在電力短缺的時候再釋放出來，以滿足供需之間實時平衡的需要。

In the winter, Germany has little sun right when power demand peaks for the year – in this case, just below 80 GW. Solar barely appears, and wind power drops to a meager 0.292 GW at 3 AM on November 15 – when there is simultaneously 0 GW of solar.
Clearly, what is needed here is not hourly or even daily power storage, but seasonal – and the best way to do that is #chemically.
This is where power-to-gas (P2G) comes in. Excess electricity from the summer could be used to split water into hydrogen and oxygen, and the hydrogen could be stored in existing natural gas networks – no additional storage infrastructure needed. Germany has an estimated four months’ worth of power storage capacity in its gas networks today, and because gas can be used to power vehicles, for cooking, to provide heat, and to generate electricity, it is versatile.