Table 4 (aggregated national electricity, 1980q1-2002q4) is explicitly named the authors' preferred electricity model over the per-capita specification || 'For these reasons, the model for aggregated national electricity consumption (Table 4) is our preferred model.' (p.3459)
De Vita, G., K. Endresen, and L.C. Hunt (2006): “An Empirical Analysis of Energy Demand in Namibia.” Energy Policy 34(18), 3447–3463