A Düsseldorf, Germany-based energy company called Uniper announced last week that it sent methane made from renewable hydrogen into the local natural gas pipeline.

The methanation plant in Falkenhagen that made the synthetic methane opened in May 2018 (PDF), and the plant's operators began testing the process to combine renewable hydrogen with carbon dioxide from a nearby bioethanol plant.

"Today, the plant produces up to 1,400 cubic meters of synthetic methane (SNG) per day, which corresponds to approximately 14,500 kWh [kilowatt hours] of energy," a Uniper press release noted.

The methanation plant receives renewable hydrogen (H2) from a nearby plant that has harnessed excess wind and solar power for electrolysis-based hydrogen synthesis since 2013.

The renewable-hydrogen project is run with help from Store & Go, a European Union-funded research program that recently partnered with CO2-capturing startup Climeworks to build a synthetic methane plant in Troia, Italy.

Uniper's Falkenhagen-based methanation plant combines the renewable H2 from Store & Go's nearby electrolysis plant with captured CO2 from the nearby bioethanol plant, combining the two molecules to create methane (CH4), the primary ingredient in natural gas.

The text above is a summary, you can read full article here.