Germany's natural gas storage levels are currently at their lowest point for this time of year in nearly two decades. UBS has issued a warning that if the Northern Hemisphere experiences a harsh winter, Europe's largest economy could face the twin pressures of soaring gas prices and supply shortages simultaneously.

According to a report released on Monday by UBS macro strategist Simon Penn in London, Germany's gas storage facilities are only filled to 48% capacity. This is significantly lower than the 65% recorded a year ago and the 75% seen during the 2022 energy crisis, marking the lowest storage level for this period in 17 years.

UBS economist Felix Huefner projects that Germany's storage rate will only reach around 65% by November. This figure not only falls well short of the German government's 80% target but also lags considerably behind the European Union's 90% requirement. The storage deficit is rekindling market concerns over winter energy supply and could further push up inflation in the eurozone while dragging on German economic growth.

Low inventory faces multiple constraints on refilling

UBS points out that if Germany accelerates its efforts to hit storage targets, it could itself drive up natural gas demand and prices. Refilling reserves through the Trading Hub Europe (THE) could also add to fiscal pressure. Furthermore, large-scale purchases by Germany might crowd out supply for other European nations, intensifying regional energy competition.

Supply-side bottlenecks are equally problematic. Germany's limited regasification capacity means that even if it can secure enough liquefied natural gas (LNG) on the international market, it may not be able to convert it into pipeline gas for storage in a timely manner. This suggests that simply increasing LNG procurement cannot fully eliminate the risk of actual gas shortages late in the winter season.

Adding to the strain, low water levels on the Rhine River are further restricting the transport of energy and industrial goods in Germany. UBS notes that the navigable water depth at the key Kaub chokepoint on the Rhine is currently only about 10 centimetres, compared to 400 centimetres in February and 200 centimetres a year ago. This has forced cargo barge loads down to 10% to 20% of normal capacity, significantly hampering resupply efforts.

Rising prices put pressure on inflation and growth

Natural gas supply risks could also transmit quickly to the broader economy. The European Central Bank estimates that a 10% increase in wholesale gas prices would push up overall eurozone inflation by approximately 0.6 percentage points. For Germany, higher energy costs combined with Rhine transport bottlenecks could further weigh on an already strained economic outlook.

UBS believes winter weather will be the key variable for Europe's energy market. If the Northern Hemisphere endures severe cold, Europe could face a "cold and expensive" winter. Conversely, if El Ni帽o brings relatively mild conditions, it could ease supply-demand pressures. In other words, whether Germany navigates the winter smoothly depends not only on the pace of refilling its reserves but also on the weather patterns over the coming months.