The generation of renewable energy is volatile and the storage of green electricity at times when production exceeds consumption is an ever-increasing challenge for energy market participants. Power to gas (PtG) technologies appear to be particularly effective in compensating for the weather-related volatility of the renewables. Since TSCNET shareholder Energinet is not only the Danish transmission system operator (TSO) for electricity, but also for gas, the company is ideally suited to profoundly evaluate the PtG potential. The Danish national energy goal is a 100% climate-neutral energy system by 2050, and PtG can play an important role in achieving it.
Energinet’s gas grid could be an essential tool for the transmission of solar and wind energy in Denmark’s energy system of the future, as the energy can be stored and transported in the gas pipelines with hydrogen as the energy carrier. To this end, the electricity is converted into hydrogen, which can then be mixed with natural gas. The TSO is currently testing how much hydrogen the gas grid can handle. The tests take place near the West Jutland town of Varde and are part of the “Hydrogen Injection in the Gas Grid” project, in which Energinet is cooperating with the Danish Gas Technology Centre and IRD Fuel Cells.
The gas in the pipelines near Varde is presently mixed with 12% hydrogen, the research target is 15%. At the beginning of the tests in summer 2017, it was only 2%, so the results are promising. „Using hydrogen as an energy carrier allows us to connect the electricity and gas sectors,“ explains Jesper Bruun, project manager at Energinet, and adds: „Once we are able to handle the hydrogen in the gas grid, we will have an extensive and efficient infrastructure in place for transport and storage.“