Authors' headline national time-average estimates are the Model 1 (Handbook data) short-run -0.554 and long-run -1.186 || 'by modeling data from the Handbook of the Electric Power Industry, we estimate the short-run and long-run national price elasticities in time-average value as -0.554 and -1.186, respectively' (p. text after Table 5, corpus lines 393-394)
Otsuka, A., & Haruna, S. (2016): "Determinants of residential electricity demand: evidence from Japan." International Journal of Energy Sector Management, 10(4), 546–560.