The Capitol Area System (CAS) Management Unit operates the CAS district heating and cooling loop in the Hartford Capitol District which services multiple buildings in the Capitol region, including the Legislative Office Building, the State Office Building at 165 Capitol Avenue, the Supreme Court, as well as non-state entities such as the Bushnell theater, totaling more than three million square feet of building space.

CAS provides:

• Hot water for space heating
• Domestic hot water production
• Chilled water for space cooling

Update: The planned upgrade is being re-evaluated due to developments in transportation infrastructure and budgetary constraints. DAS will continue to maintain the plant, ensuring that all systems remain operational and addressing repairs to support ongoing functionality.

Previously, DAS undertook a decarbonization study for the CAS plant.