Germany's Uniper SE, the country's largest utility (recently bailed out by state-owned lender KfW), warned Thursday that plunging water levels on the Rhine River have reduced barge shipments of coal to a key power plant, exacerbating an energy crunch as power prices soar to record highs, reported Bloomberg.

The river at Kaub, Germany, is around 21.6 inches (55 centimeters) on Thursday and is expected to drop to 18.5 inches (47 centimeters) by Saturday, according to the German Federal Waterways and Shipping Administration. Currently, Europe's most crucial waterway is 5.9 inches (15 centimeters) from being impassible, the threshold where barge traffic is 15.7 inches (40 centimeters).