Thursday, 30 July 2026

Six gas transmission system operators are now behind the Nordic-Baltic Hydrogen Corridor, and early industry backing has covered 87% of the pipeline's planned capacity, according to Hydrogen Fuel News.

The operators named by Hydrogen Fuel News are Gasgrid Finland, Elering, Conexus Baltic Grid, Amber Grid, GAZ-SYSTEM and ONTRAS. The outlet describes the group as seeing real potential in the market for cross-border hydrogen transport.

Demand signals have run ahead of construction. Industry players responding to the corridor's call for interest have expressed appetite for about 79.2 TWh of hydrogen a year, Hydrogen Fuel News reported. That expressed volume, together with the 87% capacity coverage figure, is the clearest indication so far that offtake interest rather than supply is leading the project.

The corridor is positioned as Europe's first large-scale cross-border green hydrogen pipeline, running from the Arctic Circle to Central Europe, according to Hydrogen Fuel News. Routing hydrogen along that axis puts northern electrolysis output within reach of industrial consumers further south, using the transmission operators' combined footprint rather than a single national grid.

The six-operator structure matters for how the line gets built. Each participant controls transmission assets in its own jurisdiction, so capacity allocation, tariffs and interconnection points have to be agreed across all of them before the corridor can move hydrogen commercially.

Engineers at Germany's Fraunhofer Institute for Solar Energy Systems (ISE) have drawn up standardized designs that swap gas and oil boilers in apartment blocks for heat pumps running on propane, or R290, pv magazine reported.

The designs came out of the LC R290 research project, which paired the institute with 20 firms drawn from heating manufacturing and the housing sector, according to pv magazine.

The project produced several designs rather than one. Nienborg, the project coordinator at Fraunhofer ISE, said "there is no single technological solution" given constraints such as heat source availability and tight space, and that the team instead built out multiple applicable options, in comments carried by pv magazine.

The sample buildings came from the property portfolios of the participating housing companies and carried heating loads between 23 kW and 93 kW, pv magazine reported. That four-fold spread is the reason a single product specification does not cover the stock.

On the central-system side, the team built an outdoor unit that carries 20% less propane than comparable machines while delivering a 15% efficiency gain, according to pv magazine. Refrigerant charge is the binding design variable for propane in occupied buildings, since R290 is flammable and charge size drives siting and safety rules.

Where an outdoor unit will not fit, the alternative is an indoor configuration built around a 28 kW brine-to-water heat pump tuned for a low refrigerant charge, pv magazine reported. The brine loop shifts the refrigerant circuit away from the heat source, which suits buildings with no usable external footprint.