ALDI US and Grocery Outlet receive awards based on use of natural refrigerants.
CO2 installations include warm regions of the U.S., such as California, Florida, Texas and Georgia.
But CO2 refrigerant was still only 0.42% by weight in 2017 across 11,257 stores in EPA program.
Last year, Hillphoenix refrigeration equipment was installed in 87% of GreenChill-certified stores under the U.S. Environmental Protection Agency (EPA) scheme.
U.S. supermarket chain wins award recognizing best GreenChill certified store in Tuesday morning award ceremony at FMI Energy Conference.
Store cuts energy consumption by 33% and saves $74,640 over 13-month period, thanks to cascade system and other improvements.