80x50 is New York City’s commitment to reducing greenhouse gas emissions by at least 80% by the year 2050.


The forthcoming New York State Energy Conservation Code will be based on IECC 2018 and ASHRAE 90.1-2016.

The New York State Stretch Energy Code 2019 will have an impact of 5-17% less energy (BTU) than the current code (ASHRAE 90.1-2013), resulting in buildings that are roughly 3.5% more efficient than commercial provisions included in ASHRAE 90.1-2016.i.

Specific parameters of the stretch code include an “envelope backstop” which will require a minimum performance of the buildings envelope, regardless of how many other improvements a building makes. 

Other features include air leakage testing, higher performance envelope requirements, more stringent fan power limits, and reduced lighting power densities.


The bill sets hard greenhouse gas emissions limits and expands existing retro-commissioning requirements for buildings in the city over 25,000 SF. The emissions cap reflects the total annual consumption of each building, from all utility sources including electric, gas, steam, and chilled water. The total consumption of each source is then converted to CO2 emissions.