In March 2018, Lawrence Berkeley National Laboratory (LBNL) and Nexant released a significant upgrade of the Interruption Cost Estimate (ICE) Calculator. While most of the improvements involved a modernization of the user interface, there are two notable modifications to the underlying econometric models. LBNL and Nexant documented the original models and customer interruption cost meta-analysis in a 2009 report. They subsequently revised the meta-analysis and econometric models for the ICE Calculator in 2015, as documented in an updated report. The models for the current version of the ICE Calculator are based on two additional modifications summarized in this update.