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This paper shows how the cash flows received by an unregulated firm operating in a workably competitive market can be replicated for a regulated firm. The only change to standard regulatory practice is that each time the regulated firm invests, the amount added to its rate base is the product of its capital expenditure and a multiplier, greater than one, that captures the reduction in value of the unregulated firm's growth options that occurs whenever the firm invests. The regulated firm is allowed to earn a rate of return equal to its weighted-average cost of capital, applied to this rate base. Four possible approaches to estimating the size of the multiplier are presented, each based on an established real-options investment model.
► This paper shows how to replicate workable competition for regulated firms. ► Investing lifts the rate base by the product of capital expenditure and a multiplier. ► The multiplier captures the reduction in value of growth options. ► The firm earns a return equal to its weighted-average cost of capital. ► Four possible approaches to estimating the size of the multiplier are presented.