Logistic saturation spec explicitly preferred; national series carries the price headline || "there is a clear preference for the logistic specification" (p.275); "own-price elasticities are negative and statistically significant - about -0.35 in the short run and -0.81 in the long run" (p.274)
Berndt, E. R., and R. Samaniego (1984): “Residential Electricity Demand in Mexico: A Model Distinguishing Access from Consumption.” Land Economics 60(3), 268-269