Author prefers delta=0.90/0.95 for projections -> the -0.88 (T2D) and -0.84 (T2E) estimates; Table 10 simulations use delta=0.9 || "Projections are made for both the delta = 0.90 and the delta = 0.95 cases. These values seem far more plausible than ones as low as 0.75 or 0.50." (p.549). Note: -0.91 (T2A) is the value showcased vs Wilson (Table 3 p.537).
Anderson, K.P. (1973a): “Residential Demand for Electricity: Econometric Estimates for California and the United States.” The Journal of Business 46(4), 526-553