Authors' headline is the long-run price elasticity ~ -1 (abs) in each sector, printed WITHOUT standard errors in Table 4, so uncodeable; among the coded short-run own-price coefficients from the final structural-shift model, the residential coefficient is the most statistically robust (t=-10.28) -> mark obs 2512 preferred || 'Long-run price elasticities are estimated to be approximately one (in absolute value) in each sector' (p.268)
Sutherland, R. J. (1983b): “Instability of Electricity Demand Functions in the Post-Oil Embargo Period.” Energy Economics 5(4), 267-272