“…54 The price is estimated in the first stage of the 2SLS based on the VRE penetration to the demand, while the PED is estimated in the second stage. 55 The first stage is expressed in Equation 1 : Where is the dependent variable of regional wholesale price in a vector of . , d, and denote the regional cross-section panels (i.e., the nationwide wholesale regions depicted in Figure 6 ), timing dummy variables, and hourly intervals, respectively.…”