Former TVA Chairman challenges fairness of TVA yardstick for power rates. Washington, D.C., Dec. 3. Former TVA Chairman Arthur E. Morgan today challenged the fairness of the TVA yardstick for power rates before the Joint Congressional Committee Investigating the Government's Power Program. Since he was 'fired' Morgan has conducted a personal study of TVA rates and allocations of costs of constructing the dams, on which the rates are based