Authors judge WLS and Random Effects the most reasonable specifications, but for electricity they run a Hausman test that REJECTS the random-effects assumptions and conclude a fixed-effects model is necessary for consistency; still, they repeatedly note the fixed-effects price elasticities are implausibly large. No single headline own-price number is offered. || 'Overall, the WLS and random effects estimates look most reasonable, except for the positive price and negative income elasticities' (p.204); 'The null hypothesis of no misspecification in electricity demand is rejected with an F test at the .01 level of significance ... a fixed effects model is necessary for consistency' (p.206).
Hartman, R. S., and A. Werth (1981): “Short-Run Residential Demand for Fuels: A Disaggregated Approach.” Land Economics 57(2), 195-212