A massive heat wave across eastern US pushed electricity demand close to record levels on Friday, prompting the country's largest power grid operator to activate emergency measures to reduce consumption.

La orden del Departamento de Energía activa mecanismos especiales para forzar el despacho de plantas y asegurar el suministro de 67 millones de personas ante picos de demanda…

"PJM has implemented several alerts and actions to maintain reliable system operations..."