Techniques for Estimating Replacement Energy Values of Electrical Generating Units

Evaluations of generating unit modifications often utilize replacement energy values which are much lower and less accurate than those obtained when economic dispatch and location of a unit in the dispatch sequence are considered, and the practice tends to denigrate the value of maintaining or improving plant productivity. A relatively simple technique is presented for properly accounting for the position of a unit in the dispatch order when estimating the replacement energy values for derating/uprating generation units. The actual utilization of the generation capacity segment added or lost is also included.