Both the long-run cointegrating own-price elasticity and the short-run ECM own-price elasticity are the paper's headline reported quantities || 'report the short- and long-run elasticities' (Abstract, p.493) and 'The short-run elasticities for real disposable income and electricity price are roughly the same and of opposite signs. The short-run elasticities are one-half of the long-run elasticities.' (Conclusions, p.507)
Silk, J. I., and F. L. Joutz (1997): “Short- and Long-Run Elasticities in U.S. Residential Electricity Demand: A Cointegration Approach.” Energy Economics 19(4), 493-513