Summary p. vi: "the short-run effect of a change in the marginal price of electricity is to produce an elasticity of about -0.35. The longer run adjustment shows an own-price elasticity in the intensity of utilization of around -0.70" || preferred = the -0.35 pooled two-year Spec-I time-series cell (the SR headline); the LR -0.70 is the MEAN of the Table-1 cross-sections (the set republished in Acton et al. 1980).
Acton, J.P., B.M. Mitchell, and R.S. Mowill (1976) “Residential Demand for Electricity in Los Angeles: An Econometric Study of Disaggregated Data.” Rand Corporation Report R-1899-NSF, Santa Monica, California.