Electricity distributors Edenor and Edesur both reported power outages as the high temperatures generated a spike in demand for energy to cool homes and businesses.

The National Electricity Regulatory Entity (ENRE) said Edenor’s power cut had affected 700,000 in the Buenos Aires area. Some 43,400 Edesur customers were left without power after failures of high-voltage lines hit two of its substations.

AySA, which provides drinking water in Buenos Aires, asked the population to optimize the use of water because the outage had also affected its purification system.

High temperatures are expected to continue throughout the week with peaks close to 40 C, according to the National Meteorological Service (SMN).

“The SMN issued a warning in anticipation of an extreme heat wave this week, with temperatures that could reach 41°C in the concession area,” Edesur said in an email to its clients. “We are working to strengthen our network in the face of growing demand.” (Reporting by Eliana Raszewski; additional reporting by Jorge Otaola; writing by Carolina Pulice; editing by Lucila Sigal and Jonathan Oatis)