No single author-preferred estimate; the 12 monthly elasticities of Table 3 are jointly the headline || "We find that price elasticities are higher (in absolute value) during peak periods of demand." (Abstract p.167)
Archibald, R.B., D.H. Finifter, and C.E. Moody Jr. (1982): “Seasonal Variation in Residential Electricity Demand: Evidence from Survey Data.” Applied Economics 14(1), 167-181