The headline finding is that residential electricity demand is price-elastic in the LONG run (E/G significant at -.406 in the average-consumption Q regression) but shows no strong short-run impact; the -.406 (obs 2833) is the author's featured estimate. || 'Previous work indicates that residential demand for electricity has generally been price elastic in the long run. The empirical evidence presented below is consistent with that finding.' (p.419); 'the relative price of electricity was statistically significant with respect to average consumption, but insignificant with respect to recent demand increases, thus underscoring the long-run nature of the price-quantity relationship.' (p.422-423)
Wilson, J. W. (1974): “Electricity Consumption: Supply Requirement, Demand Elasticity, and Rate Design.” American Journal of Agricultural Economics 56(2), 419-427