Romania has shut down its only nuclear plant in a rare move prompted by the lack of cooling water from the Danube River. Hungary, meanwhile, is racing to dam the Danube, trying to keep its Paks plant online.

Heat and drought are curbing nuclear output across Europe, with Romania facing a possible reactor shutdown and France reducing generation.

BUCHAREST: Romania will begin shutting down its only nuclear power plant on Thursday after the Danube’s flow fell to a record low this week and efforts to avert a complete…