"It's symbolic, but an important step," Hidalgo said, brushing off criticism that Paris authorities could do more to reduce energy consumption by 10 per cent — the target set in July by President Emmanuel Macron as part of a nationwide "sobriety plan" to conserve energy.
For safety reasons, streetlights will stay on across Paris and the ornate bridges over the Seine River will remain illuminated at night, Hidalgo told reporters.
To align with France's savings plan, she said she would press the government to adjust the lighting on national monuments in Paris, such as the domed Pantheon and the Arc de Triomphe, the famous Napoleonic arch that dominates the Champs-Elysees Avenue.
Paris authorities also aim to save energy by moving back when they turn on the heat in public buildings for a whole month, from mid-October to mid-November. They also plan to lower the temperature in public buildings by 1 degree, from 19C to 18C during office hours, and to 16C after hours and on weekends.