New York City’s administrative buildings have expanded their participation in demand response programs managed by Consolidated Edison in an effort to alleviate grid stress and reduce electricity costs. Some 555 facilities across dozens of agencies and organizations are participating in the program this summer, including 90 new participants, the city announced Wednesday.

“When usage reaches a fever pitch, we can do our part to avoid blackouts and brownouts,” Department of Citywide Administrative Services Commissioner Dawn Pinnock said in a statement.

The largest U.S. city is baking under a brutal heat wave, and Con Edison on Monday assured customers that it was “mobilizing to respond to any service problems that occur as temperatures rise into the 90s for a second consecutive week.”

The utility also noted that it offers energy efficiency measures to commercial, industrial and residential customers, including for lighting, heating and cooling, and other equipment.

New York City has been participating in Con Edison’s demand response program since 2013. Since then, city agencies have earned program revenues of more than $100 million. Collectively, the city’s participation across buildings and agencies can reduce peak energy demand by 115 MW, the city said.

“Every building has target reduction goals and specific action plans for achieving the reduction,” the city said, including powering down equipment, reducing air conditioning demand and shutting off lights.

City buildings are also participating in a winter demand response program to cut natural gas usage. More than 60 facilities across six city agencies are working with National Grid to cut gas consumption, and five facilities between two agencies are similarly working with Con Edison.