Region-specific fixed regional + temporal effects models are the ones the authors carry into their headline policy/CO2 calculations (Table 5 U.S. row uses the -0.248 estimate; EU 'roughly -0.20'). || 'Considering only U.S. data, the U.S. price elasticity ranges from -0.25 to -0.21 ... Considering only EU countries ... roughly -0.20 for all the models tested' (p.26)
Azevedo, I. M. L., Morgan, M. G., & Lave, L. (2011): "Residential and Regional Electricity Consumption in the U.S. and EU: How Much Will Higher Prices Reduce CO2 Emissions?" The Electricity Journal, 24(1), 21–29.