The short-run electricity own-price elasticity of -0.25 is the paper's headline own-price electricity result, stated explicitly in the text as the relative price elasticity of electricity from the two-stage error-correction demand for electricity || 'In the short-run equation (where Z is the residual of the long-run equation), the relative price elasticity of electricity is found to be -0.25, while output elasticity is 1.33.' (p.401, corpus lines 409-411; table B.2.2 p.413)
Christodoulakis, N. M., and S. C. Kalyvitis (1997): “The Demand for Energy in Greece: Assessing the Effects of the Community Support Framework 1994-1999.” Energy Economics 19(4), 393-416