Furthermore, hydrogen can be recovered: for example, if the electricity generated by a rooftop solar panel is used to extract hydrogen from water, the hydrogen can be stored and used to power a fuel cell. This can solve the problem of what to do with excess electricity generated by a home system.
此外，氫氣還可以反向取得，例如將家戶頂樓太陽能板所製造的電能轉換成氫氣，再利用燃料電池產生電能，如此一來，就解決了自產電能無處可去的困擾。