The paper's headline demand result is the OLS price coefficient of eq. (16), interpreted as the short-run own-price elasticity, and its long-run counterpart. || "If one gives the price coefficient an elasticity interpretation, for example, a 1% increase in price will result in a 0.57% decrease in the peak system load. The adjustment parameter, w, is relatively large ... resulting in a long-run peak elasticity of 0.71." (p.165)
Uri, N.D. (1979e): "A Mixed Time-Series/Econometric Approach To Forecasting Peak System Load." Journal of Econometrics 9(1-2), 155-171