Author explicitly bases analysis on Model B (OLS, city-specific shares), whose price elasticity -0.299 rounds to the headline -0.30 quoted in abstract and conclusions || 'Therefore, our analysis is based on the estimation results of Model B.' (p.537); 'The estimated long-run own price elasticity is -0.30.' (p.537)
Filippini, M. (1999): “Swiss Residential Demand for Electricity.” Applied Economics Letters 6(8), 533-538