Authors' headline is the overall short-run own-price elasticity beta = -.02 (summer) / -.04 (winter), stated in the abstract and repeated in the conclusion. || 'The measured short-run price elasticities for electric power (-.02 to -.04) confirm earlier findings of inelastic electricity demand.' (p.426, Sec. 5)
Herriges, J.A. and K.K. King (1994): “Residential Demand for Electricity Under Inverted Block Rates: Evidence from A Controlled Experiment.” Journal of Business and Economic Statistics 12(4), 419-430