Author repeatedly designates the 48-states-combined flow-adjustment (dynamic) equation as the headline; short-run own-price elasticity singled out as the key result || "The most important equation is the one for the 48 states combined. All the estimates are highly significant, the low standard error on the short-run price elasticity being especially gratifying." (p.37); conclusions: "-1.4 for the marginal price of electricity" long-run (p.39-41)
Houthakker, H. S. (1980): “Residential Electricity Revisited.” The Energy Journal 1(1), 29-41