By utilizing data and digital technology and conducting management that encourages power-saving behavior based on electricity deregulation policies such as dynamic pricing and demand response, to manage both stable electricity supply and decarbonization during times of power shortage (i.e., Green Transformation: GX). In this paper, we use data sets of electricity supply and demand, weather and wholesale electricity market in the TEPCO area from FY2016 to 2023, and we constructed and analyzed the impact assessment model of the wholesale electricity market on maximum electricity demand. Then, we assessed the impact of electricity deregulation policies on GX and verified its effectiveness.