IV estimate −0.886 is the paper's headline; the authors reject OLS as biased ("regarded as incredible") and use −0.886 for all welfare/subsidy simulations and repeat it in the conclusion. || "a multinomial logit model was used to obtain an instrumental variable for household's average electricity price, and a demand function is established to estimate the price elasticity as −0.886." (p. 9, printed)
Wang, Y., & Lin, B. (2021): 'Performance of alternative electricity prices on residential welfare in China.' Energy Policy, 153, 112233.