Summary reports the headline own-price elasticities of average consumption: approx -0.25 (no electric space heat) and -0.52 (with electric space heat) at marginal cost, rising to -0.33 and -0.60 when average cost rises in proportion to marginal cost || 'an elasticity with respect to marginal cost ... of approximately -0.25 for households without electric space heat and -0.52 for households with electric space heat. When average cost of electricity rises in proportion to marginal cost, these elasticities increase to approximately -0.33 and -0.60, respectively.' (Summary, p.3)
McFadden, D. L., C. Puig, and D. Kirshner (1977): “Determinants of the Long-Run Demand for Electricity.” Proceedings of the Business and Economics Section of the American Statistical Association, 109-119