Authors' headline implied own-price elasticities, stated in the abstract's spirit and reported explicitly in the Table 2 notes and again in Section III.B as the summary elasticities || 'Combining all cycles, the average price elasticities and standard errors are -0.136 (0.017) for the summer and -0.141 (0.018) for the winter.' (p.257) and Table 2 notes: 'The implied price elasticity estimates are -0.136 (0.017) for the summer and -0.141 (0.018) for the winter.' (p.253)
Ito, K., Ida, T., & Tanaka, M. (2018): "Moral Suasion and Economic Incentives: Field Experimental Evidence from Energy Demand." American Economic Journal: Economic Policy, 10(1), 240–267.