Greenpeace Energy is selling methane generated by electrolysis from wind energy.
See here: https://www.h2-international.com/2019/04/01/joint-effort-to-...
See here: https://www.h2-international.com/2019/04/01/joint-effort-to-...
Greenpeace Energy was founded in 1998, started selling gas in 2011, and purchased that first electrolyser in 2018[0].
As of 2020, the gas they were selling was about 1% hydrogen[0], 99% fossil imports. In 2021 the major change was to add 10% biogas to the mix.
[0] although they've been feeding-in hydrogen since 2014
[1] we'll just trust that it is indeed all wind-powered electrolysis.