Siemens presents three-point plan for implementing cost-efficient energy transition in Germany
Bombardier showing TRAXX AC Last Mile Locomotive

E.ON power-to-gas unit injects hydrogen into natural gas system for first time

A power-to-gas (P2G) unit installed by E.ON in Falkenhagen in eastern Germany (earlier post) injected hydrogen into the natural gas system last week for the first time as part of a function test. During the test, which lasted three hours, the unit produced 160 cubic meters of hydrogen, which was injected into the gas pipeline system.

It marks the first time E.ON has successfully implemented all stages of the process, from receiving electricity to injecting hydrogen.

The P2G unit receives its power from a nearby wind farm. The power runs electrolysis equipment that transforms water into hydrogen which is injected into the regional gas transmission system. The hydrogen becomes part of the natural gas mix and can be used to generate power or heat.

The P2G system—like Audi’s eGas project (earlier post)—uses renewable electricity to produce hydrogen via electrolysis. The hydrogen can be used directly, or combined with CO2 in a methanation process to create synthetic methane. Source: E.ON. Click to enlarge.

The P2G unit is scheduled to enter service in late August. Once operational, it will use surplus renewable-source electricity to produce about 360 cubic meters (32.4 kg) of hydrogen per hour. It will therefore harness renewable-source electricity that otherwise could not be fed into the grid. The region’s wind farms already frequently produce more electricity than the local grid can handle.

E.ON installed the unit in Falkenhagen because the location is ideal. The region has a high output of wind power, the necessary power and gas infrastructure is already on hand, and E.ON has a control center there.



This will work great as long as they can get wind-power virtually free.

I am not sure what they will do with these units when modern and cost-effective grid-storage equipment becomes available.

Since current P2G seemingly has horrible efficiency (starting with water splitting at 20-30% efficiency), a 75-85% grid-battery (Durathon, EOS) will beat this in efficiency many times over.


Watter spliting 30% efficient and then you have generate power again at 50% efficiency. What is left - 15%. Good business wasting energy.


Excess wind-solar energy is clean and free. Using it instead of 'flaring it' like Oilcos do with excess NG is a smart common sense idea.

Secondly, NG + Hydrogen burn cleaner.


What do you want to bet that the wind producers love this idea because they can get the FIT rate for more wind, only pay the electrolyzer the wholesale rate (which can be less than zero during surpluses), and soak the consumer for the difference?


That is called good business dealing, i.e. maximize profits from consumers?


I'd call it a rigged "market" and self-dealing.


@ Darius
Alkaline hydrogen electrolyser delivers hydrogen at 15 barg g using 4.9 kWh per Nm3 of H2. With HHV of H2 at 39 kWh/kg and density 0.09 g/L this gives 3.5 kWh/m3
That is 70% efficiency.

The comments to this entry are closed.