Authors' base/preferred specification is the double-log demand function with country-specific price elasticity (obs 3593-3603 = Table 4 'Double log' column) || 'We briefly summarize the main results from our base specification, a double log demand function with country-specific price elasticity' (p.69) and 'in our preferred specification, the double log functional form' (p.70).
Krishnamurthy, C. K. B., & Kriström, B. (2015): "A cross-country analysis of residential electricity demand in 11 OECD-countries." Resource and Energy Economics, 39, 68–88.