District heating and cooling networks

Baltimore ranks 20 on the list of America's largest cities. What was once a center of industry has now been transformed into a state-of-the-art service hub.


Baltimore, Maryland, is one of the biggest ports on the east coast of the United States. It is a city with biting winters and sweltering summers. Veolia Energy North America owns and operates three district heating networks in the city, providing heating and cooling to some 270 major service-sector customers, including the 24-story, 55,700 square-meter Legg Mason Tower, which has achieved LEED® Silver rating(1) and has chosen to use the Veolia Energy North America networks to optimize its sustainable development performance.

(1) International environmental rating system for office buildings comprising four levels of certification: bronze, silver, gold and platinum.


Veolia Energy North America also operates heating and cooling networks comprising over 18 km of pipes through which its cooling units provide air-conditioning to 51 customer sites. To prevent production blindly following demand without properly managing the cost of electricity, which can vary greatly depending on the time of day, two storage facilities containing chilled water at 0°C with a capacity of 263 MWh were installed in 1996 and 2000.

These units work a bit like batteries. The chilled water is produced when costs are lowest, then fed into the network to offset spikes in consumption.
Stacy Wirth
Customer Account Representative, Veolia Energy North America


Key figures

635 metric tons of steam per hour, 53 MW of hot water, 33,780 metric tons of cooling

tons of CO2 

60% renewable energy 

23.5 km of pipes for steam and hot water

18.2 km of chilled water pipes

Customer benefits

  • Reduction in the city's carbon footprint
  • Optimal distribution of heating and cooling
  • Contribution to local economic development


  • Heating network management
  • Cooling network management with energy storage solutions