Authors' headline is the 2SLS IV estimate that corrects OLS underestimation: industrial -0.955 and residential -0.886 || 'two-stage least-squares (2SLS) estimation shows that the price elasticities of industrial and residential demands for electricity are -0.955 and -0.886, respectively' (p.2, Introduction); reaffirmed in Conclusion 'the OLS method underestimated the elasticity of both industrial demand (-0.955) and residential demand (-0.886)' (p.10)
Zhai, Z., Zhang, L., Hou, X., Yang, Q., & Huang, Z. (2023): "Price elasticity of electricity demand in China – A new instrument variable based on marketization policy." Energy for Sustainable Development, 76, 101275.