ASHRAE has published carbon dioxide emission rates and source energy conversion factors for fuels used in buildings and for electricity use in each of the 26 EPA eGRID subregions. The updated figures result from a couple of years of work by Working Group 7.5 of Standard 189.1, which I chair. These data will be published in the 2020 release of Standard 189.1 and will become part of the 2021 update to the International Green Construction Code (IgCC). The source enrgy conversion factors take account of the increased renewable energy on the U.S. electric grid by assuming a zero heat-rate for non-combustible renewable energy sources like wind and solar. The carbon emission rates consider all climate pollutants such as methane and nitrous oxide and include upstream emissions from extraction, processing, transportation, storage and distribution. The global warming potential (GWP) of non CO2 pollutants is based on a 20-year time horizon. .