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Introduction . This report is a significant milestone in Western Area Power Administration's (Western) Replacement Resources Process. The Replacement Resources Methods Report (Methods Report) describes the study, findings and conclusions in Western's evaluation of economically and technically feasible methods that the agency proposes to use to replace capacity made unavail- able ("los!") due to changes in operational constraints at Glen Canyon power plant, and other power features of the Colorado River Storage Projcct (CRSP). This document mects thc rcquire- mcnts for the rcportrcquired by Scction 1809 of the Grand Canyon Protection Act (GCP Act) of 1992 (Titlc XVIII of thc Reclamation Projccts Authorization and Adjustment Act of 1992, PL. 102-575), Volume 1 of this rcport summarizcs Western's Replacement Resources Process. It provides background infonna- tion on thc proccss used to consult with' intcrested parties, thc analysis uscd to test the feasibility of mcthods to rcplace capacity lost at Glen Canyon and the proof-of-conccpt methodology. It also outlincs the methods Western will use to acquirc rcplaccment rcsourccs, including a discussion on how replaccment options will be evaluated. Finally, this report addresscs Westcrn's conclusions and outlines Westcrn's proposals for how it will mect customer's needs for rep!ace- ment power. Additional details on thc background, resource acquisition and the proof-of-concept modcling are found in Volumc 2 of this report (Vol. 2: Methods Report) The Grand Canyon Protection Act of 1992 - Replacement Power The Replacement Resources Mcthods Report was dcvelopcd as part of the agency's Rcplacement Resources Process. This process was initiated in responsc to the GCP Act of 1992, The purpose of the GCP Act is "to protect, mitigate adverse impacts to, and im- prove the values for which the Grand Canyon National Park and the Glen Canyon National Recreation Area were established, while preserving the dam's water storage. allocation, and delivery functions. " Section 1809 of the GCP Act, entitled "Replaccment Power," specifies that "The Secretary of Energy... "...in consultation with the Secrctary of the Interior and with represcntativcs of the Colorado River Storagc Project power customers, environmcntal organizations and thc States of Arizona, California, Colorado, Nevada, NcwMexico, Utah and Wyoming... "..,shall identifY economically and techni- cally feasiblc mcthods of replacing any powcr gcneration that is lost through adoption oflong-tcnn opcrational critcria for Glcn Canyon Dam.. "...shall include an invcstigation ofthc modifications or additions to thc transmis- sion system that may bc rcquircd to acquire and delivcr rcplacement power..., "... shall include an investigation of the feasibility of adjusting operations at Hoover Dam to replace all or part of such lost generation... [and] .