The four state-level P coefficients in Table 7 are the paper's only own-estimated electricity own-price elasticities (Eq.3, long-run annual C&I model); treated symmetrically across states. || 'changes in GSP and the price of electricity are the most significant factors in determining changes in quantity demanded' (p.538, Sec 3.1)
Pielow, A., Sioshansi, R., & Roberts, M. C. (2012): "Modeling short-run electricity demand with long-term growth rates and consumer price elasticity in commercial and industrial sectors." Energy, 46(1), 533–540.