The SUR model (Table 4) is the paper's final, sector-specific specification built to answer its research question (pooled OLS and fixed effects, rows 900210/900457, are presented as limited stepping stones: "The pooled effects model is considered to be limited... the coefficient of electricity prices becomes insignificant" in FE); the abstract's headline finding — industrial (−0.869) is the only significant price elasticity while the other four sectors are insignificant — is precisely the set of five SUR estimates. || "The industrial sector has inelastic electricity demand (elasticity = -0.869) for the period 1993-2006. The price does not play a significant role in the demand for electricity for the rest of the sectors (their coefficients are all highly insignificant)." (p. 458, printed)
Inglesi-Lotz, R., & Blignaut, J. N. (2011): 'Estimating the price elasticity of demand for electricity by sector in South Africa.' SAJEMS, 14(4), 449-464.