Authors' headline is the baseline GMM elasticity ~ -0.478; abstract states the estimate 'near -0.50' and OLS is described as biased. || 'We estimate the price elasticity near -0.50' (abstract, p.37); 'sizable difference in price elasticity estimates from the two methods: -0.100 from OLS and -0.478 from GMM' (p.44)
Fell, H., Li, S., & Paul, A. (2014): "A new look at residential electricity demand using household expenditure data." International Journal of Industrial Organization, 33, 37–47.