The authors explicitly adopt the Equation 7 short-run elasticities (own-price -0.078 = 900123) as "statistically most significant", and — facing conflicting long-run evidence (multiplier 25 in the full model vs 2.6 in the supplementary model) — settle on a multiplier of 7, giving the LR own-price value of about -0.56 (900124) that they use for their headline decomposition of the consumption decline in Table 1; both rows are the estimates the conclusions are built on. || "We took the short-run elasticities from Equation 7 where they were statistically most significant. ... Given our short-run own price elasticity value of -0.08, we use a multiplier value of 7 to assess the relative impact of the changes in the variables in our model on the residential demand for electricity over our eleven year period." (p. 65, printed)
Dodgson, J. S., Millward, R., & Ward, R. (1990): 'The decline in residential electricity consumption in England and Wales.' Applied Economics, 22(1), 59-68.