Energy Machines is proud to have commissioned our first major project in the US. Energy Machines was selected as the energy solution provider by Hudson Square Properties, a joint venture of Hines, Trinity Church, and Norges Bank Investment Management, for the comprehensive low-carbon retrofit of 345 Hudson Street in New York.The infrastructure of the 91-year-old building - with tenants including Google, Viacom, and CBS - is being upgraded to new carbon efficient, energy saving technologies to decarbonize the 91,000 sq m property by 2032. Our integrated energy solution will optimize the building’s energy usage by recycling energy throughout the property - and eventually between neighboring buildings. A network of water-source heat pumps placed on different floors enable the easy sharing and movement of heat, including waste heat from everyday operations, throughout the entire structure.This energy retrofit will reduce 345 Hudson's energy consumption by 30-40% and cut CO2 emissions by 90% compared to its pre-retrofit baseline. The project is one of the four Empire Building Challenge showcase projects with NYSERDA to help accelerate New York’s progress toward their goal of reducing greenhouse gas emissions 85% by 2050.
Like most buildings in New York City, 345 Hudson previously used separate systems for heating and cooling. Now, through a vertical network of heat pumps, heating and cooling are integrated into a single system – enabling heating and cooling to be efficiently shared between floors.
A basement gas boiler has been replaced with air-source heat pumps on the roof and water-source heat pumps throughout the building, allowing heat to be pulled from or dumped into a central ‘heat pump artery.’ This integrated approach enables the recovery and redistribution of waste heat, which is typically expelled outside. Instead, waste heat moves from areas of surplus, such as data servers, to areas of deficit, like office spaces, significantly reducing the need for additional energy to generate heat.
The Energy Machines™ electric-powered integrated system at 345 Hudson operates with staggering efficiencies exceeding COP 9, while reducing the building’s energy consumption by ~40% (in the form of electricity) and reducing its annual CO2 emissions by more than 70%.
These significant emissions reductions exempt the 17-story property from incurring the city's new CO2 taxes under Local Law 97, allowing the building owner to save more than $440,000 annually in fines alone.
Project Overview
Property: 345 Hudson Street, New York, NY
Building Owner: Hudson Square Properties – A joint venture of Hines, Trinity Church, and Norges Bank Investment Management
Building Type: 17-story Art Deco office building, built in 1931
Building Floor Area: 93.000 m2
Retrofit Type: Replacement of gas boiler with water-source heat pumps for heating and cooling
Completion Date: 2032 (phased approach)
Energy Machines™ Integrated Energy Solution: Heat pump system and vertical thermal energy network
• Transitioning from a gas boiler to an all-electric heat pump-based solution, with water-source heat pumps distributed vertically across floors via an ambient temperature loop
• Integrated heating and cooling solution where heat and cold are recycled within the building
• High efficiency with a COP exceeding 9
• Self-balancing simultaneous heating and cooling
• No minimum flow requirements, providing flexibility in installation
• No minimum turn-down ratio, accommodating varying demand efficiently
• Plug-and-play expandable design, allowing for easy scalability as needs evolve
Design Benefits
• Single heating & cooling system: Eliminates need for separate systems, improving energy balance
• Heat pumps installed floor-by-floor: Minimizes disruption as leases expire
• Energy recovery ventilation: Recycles heat from outgoing air to preheat/pre-cool incoming air
Energy Savings
~40% reduction in total energy consumption (all in the form of electricity)
Emissions Reduction
70% Greenhouse gas reduction by 2030
90% CO2 reduction by 2032
Cost Savings
~40% reduction in purchased energy (all electricity)
$440,000+ annual savings in avoided carbon fines starting in 2030 due to compliance with emissions laws
Future Scalability Potential
Potential to extend thermal energy network to nearby buildings, reducing strain on the grid
Sustainability Impact
Supports NYC’s decarbonization goals, particularly as heating and electrification continue to grow
