Full-sample 'All (48 states + DC)' estimates are the paper's headline reference; abstract/conclusions emphasize the all-states before-vs-after comparison and the finding that price elasticity decreased after deregulation || 'it is clear that price elasticity has decreased and that income elasticity has increased before and after deregulation, which is common for both deregulated and regulated states' (p.2475) and abstract 'estimates the changes in price elasticity in the residential electricity market' (p.2470)
Nakajima, T., & Hamori, S. (2010): "Change in consumer sensitivity to electricity prices in response to retail deregulation: A panel empirical analysis of the residential demand for electricity in the United States." Energy Policy, 38(5), 2470–2476.