City departments work together to keep Philadelphia cool

Philadelphia faced a severe heat wave in June 2025, causing electricity demand to peak at levels not seen since 2011. The city's Demand Response Program encouraged municipal buildings to cut energy use during this critical period. Key participants included the Philadelphia International Airport, City Hall, and wastewater treatment plants, which worked to lower air conditioning, turn off unnecessary lighting, and operate essential systems only. The Office of Sustainability led the initiative, collaborating with various city departments to implement effective energy-saving strategies. By using biogas produced from wastewater treatment, the city managed to maintain power supply while reducing costs and pollution.

The program played an essential role in preventing blackouts, ensuring residents remained comfortable despite the extreme heat. As climate change increases the likelihood of such heat waves, Philadelphia's OOS plans to strengthen its energy management efforts. The city's proactive approach highlights the importance of collaboration in addressing energy challenges during climate emergencies.