Case Study Incremental Approach to Cost Analysis for Improvements to Wise Powerhouse Penstock

by Louis G. Silva, Pacific Gas & Electric Co, United States,
Richard D. Stutsman, Pacific Gas & Electric Co, United States,

Document Type: Proceeding Paper

Part of: Waterpower '89


In 1980, Pacific Gas and Electric Company (PG&E) began studying the addition of a second powerhouse to the existing Wise Hydroelectric Project. Because of the existing project configuration, it was necessary to branch off from the existing penstock with a new penstock. To determine the most economic length and diameter for the new parallel penstock, several alternatives were analyzed. An incremental cost and benefits scheme was used. This paper presents an evaluation of two alternatives: increasing the diameter of a section of pipe at the lower end of the penstock and installation of a parallel penstock at the lower end. From existing head loss records, the energy savings for each alternative were estimated. The corresponding costs for each alternative were estimated. Tables showing incremental energy costs were derived. By use of these tables and an estimate of the long term value of energy, economic improvements were determined.

Subject Headings: Case studies | Power plants | Conduits | Hydro power | Electric power | Economic factors | Hydraulic design | Hydraulic models

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